Catalina 30

Built 1974–2008 by Catalina Yachts

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About the Catalina 30

Researched from public sources for this model. Any individual boat may have been modified or repowered — confirm before relying on any figure.

Built: 1974–2008
Builder: Catalina Yachts
Designer: Frank Butler
Length: 29.92 ft
Waterline: 25 ft
Beam: 10.83 ft
Draft: 5.25 ft
Displacement: 10,200 lb
Ballast: 4,200 lb
Hull: fiberglass
Hull / keel: fin keel
Rig: sloop
Propulsion: inboard
Fuel: 21 gal
Water: 43 gal
Holding: 17 gal
Water heater: 6 gal · AC
Number built: 6,430
Stern thruster: not fitted
Steering: varies by year · Edson

Tank capacities — where the figures come from

Fuel 21 gal
“Fuel Tank 17 Gal C-250. C-30 w/ Inspection Port” — search excerpt, catalinadirect.com · “Fuel Tank Capacity: 21 gal” — broker listing (1985), snugharborboats.com · “Fuel Capacity: 21 gallons” — search excerpt (1988 MkII), au.yachtworld.com · “Fuel Tank Capacity: 20 gal” — broker listing (1987), wheltonmarine.com · “Fuel Tank: 18 Gallon; aluminum” — search excerpt (1988 MkII), glcclub.com · “Fuel Tank: 17 Gallons (64.35 Liters)” — search excerpt (1986), mls.ybaa.org · “Fuel capacity 21 gal” — owner's manual (1990), sbo.sailboatowners.com

The reference data sheet in Catalina's 1990 Catalina 30 Operation and Maintenance Manual gives 21 gal, matching our earlier figure. Listings of 1985-88 boats give 17-21 gal and Catalina Direct sells a 17-gal replacement, so earlier boats or replacement tanks may differ; no builder figure was found for other years.
Water 43 gal
“Water Capacity: 43 gallons” — search excerpt (1988 MkII), au.yachtworld.com · “Water Tank Capacity: 43 gal” — search excerpt (1988), sailboatsalesco.com · “Water Tanks: 2. Water Tank Capacity: 48 gal” — broker listing (1987), wheltonmarine.com · “Water Tank Capacity: 50 gal” — broker listing (1985), easternyachtsales.com · “Fresh Water: 40 Gallons (151.42 Liters)” — search excerpt (1986), mls.ybaa.org · “Water Tank Capacity: 30 gal” — broker listing (1985), snugharborboats.com · “Port tank 18 gal; forward tank 25 gal; hot water heater 6 gal; total 49 gal” — owner's manual (1990), sbo.sailboatowners.com

The 1990 manual gives two tanks, 18 gal (port) and 25 gal (forward), 43 gal in all, matching our earlier figure; the manual's 49-gal total adds the 6-gal water heater, not counted here. Listings of 48-50 gal likely include the heater; 30-40 gal listings describe single boats.
Holding 17 gal
“Holding Tank Capacity: 17 gal” — broker listing (1987), wheltonmarine.com · “Holding Tank Capacity: 17 gal” — search excerpt (1988), sailboatsalesco.com · “Holding Tank: 20 Gallons (75.71 Liters)” — search excerpt (1986), mls.ybaa.org · “Holding Tank: 12 gallons; plastic” — search excerpt (1988 MkII), glcclub.com · “Waste tank capacity 17 gal” — owner's manual (1990), sbo.sailboatowners.com

The 1990 manual gives a 17-gal waste (holding) tank, and two 1987-88 listings agree. Some early boats had no holding tank, and one listing gives 12 gal in a plastic tank, possibly a replacement.
Water heater 6 gal · AC
“FRESH WATER CAPACITY: PORT TANK 18 GAL, FORWARD TANK 25 GAL, HOT WATER HEATER 6 GAL, TOTAL 49 GAL” — owner's manual (1990), sbo.sailboatowners.com · “Circuit breaker schedule: WATER HEATER B 15 amp; wiring note 'Connect wires to shore power at input side main breaker';” — owner's manual (1990), sbo.sailboatowners.com

The 1990 builder's manual counts a 6 gal water heater within the 49 gal fresh-water total (18 + 25 + 6), so don't add it twice. Its plumbing drawing shows the heater on 110 V only, with no engine loop, and the manual calls the 110 V system optional, so whether earlier or base boats had one isn't settled.

Tanks are often replaced or added on older boats — check the tank labels or a survey for yours.

Thrusters and steering — where this comes from

Bow thruster unknown
Builder brochure (9-90) and 1990 builder manual say nothing about a thruster.
Stern thruster not fitted
Our earlier figure of none has no source, and nothing was found either way.
Steering varies by year · Edson
“The original or Mark I model was built from 1975 to 1986 and features the straight cockpit designed for tiller steering” — owners' association (1975-1986), catalina30.com · “improved by the factory with a skeg, a balanced rudder, mid-boom (cabin-top) main sheeting. and pedestal/ wheel steering” — owners' association (1975-1986), catalina30.com · “The updated Mark II was built from Sept 1986 until 1993 and featured a T-shaped cockpit mold ... oriented totally to ped” — owners' association (1986-1993), catalina30.com · “THE EMERGENCY TILLER MOVES THE WHOLE STEERING, INCLUDING CABLES AND QUADRANT” — owner's manual (1990), sbo.sailboatowners.com · “My C30 has a radial drive wheel mounted in a shallow well located aft of the Edson steering pedestal. The steering mecha” — search excerpt (1987), forums.sailboatowners.com · “Pedestal Steering Rebuild Kit, Edson Classic Pedestal (listed under Catalina 30 steering parts)” — search excerpt, catalinadirect.com

The Mk I (1975-86) cockpit was laid out for a tiller, with pedestal wheel steering added as a factory improvement; the Mk II (1986-93) and later were built around pedestal steering. The 1990 builder manual describes pedestal steering with cables and quadrant but names no maker; Edson rests on an owner report and a parts supplier (Catalina Direct).

Thrusters and steering are often replaced — check the units on your boat before ordering parts.

Sources disagree on hp (Universal M-25) — left blank rather than guessed.

Standard, tall and bowsprit rigs; deep fin, shoal (4.3 ft) and wing (3.83 ft) keels. Mark II from about hull 3300 (1986, T-shaped cockpit); Mark III from 1994 (walk-through transom). Early boats had Atomic 4 gas, Atomic-Diesel, Universal 5411 or early Yanmar engines; the 3-cylinder Universal M-25 became standard in the mid-1980s. Builder history: introduced December 1974; hull 5,000 in 1987, 6,000 in 1990. Original Mark I brochure confirms 29 ft 11 in LOA, 10,200 lb, 4,200 lb lead ballast, 5 ft 3 in draft. Hull-deck joint is a flange with polyester slurry and screws under the rubrail.

Engines fitted

Atomic 4 (Universal) 4-cyl gas — gas, single standard
sailboatdata: early engines included the Atomic 4, phased out in the mid-1980s; SailboatOwners members confirm Atomic 4 gas boats among early 30s.

Sources: sailboatdata.com · forums.sailboatowners.com
Universal M-25 (3-cyl diesel) — 21 hp, diesel, single standard
sailboatdata: the 3-cylinder Universal M-25 replaced the early engines during the mid-1980s. Sound Marine Diesel rates the original M25 at 21 hp; SailboatOwners members call it a 25 hp three-cylinder.

Sources: sailboatdata.com · soundmarinediesel.com · forums.sailboatowners.com
Universal M25XP / M25XPB — diesel, single standard
Later versions of the M-25 with a slightly higher rating and better alternator bracket (SailboatOwners); the International Catalina 30/309 Association has a 1987 C30 MkII with an M25XP.

Sources: forums.sailboatowners.com · catalina30.com
Universal 5411 (2-cyl diesel) — 11 hp, diesel, single factory option
sailboatdata lists the Universal 5411 among the early engines; a SailboatOwners member's 1982 C30 has the 11 hp 5411.

Sources: sailboatdata.com · forums.sailboatowners.com
Yanmar — 11 hp, diesel, single factory option
sailboatdata lists an early Yanmar among the first engines; one SailboatOwners member has an 11 hp Yanmar. Model not identified.

Sources: sailboatdata.com · forums.sailboatowners.com
Universal M-18 (2-cyl diesel) — 16 hp, diesel, single factory option
A SailboatOwners member says a 16 hp two-cylinder Universal M-18 was offered around late 1987/early 1988.

Sources: forums.sailboatowners.com
Beta Marine BD722 (or BZ482 for 5411 boats) — 20 hp, diesel, single common repower
Sound Marine Diesel repowered a C30's Universal M25 with a 20 hp Beta BD722 and names the 13.5 hp BZ482 as the match for 5411 boats; Beta offers brackets for Atomic 4 boats.

Sources: soundmarinediesel.com

Boats of the same model can differ — check which engines yours actually has before ordering parts.

Generator

The 1990 manual covers only an optional 110 V shore-power system; no generator is mentioned.

Manuals and brochures online

Brochure Catalina 30 sales brochure (principal specifications, no tankage) (1990 (printed 9-90)) — catalinayachts.com
Owner's manual 1990 Catalina 30 Operation and Maintenance Manual (reference data sheet, systems, rigging) (1990) — sbo.sailboatowners.com

Hosted by the builder or an owners' association; they own the copyright.

Known problems for this model

Compression post and mast step sag hull
The deck-stepped mast sits on a wooden compression post/block that can rot, letting the cabin top sink at the mast step; sticking head and V-berth doors are a clue. Owners say an aluminum support replaced the wood block from about 1988.
forums.sailboatowners.com · practical-sailor.com · sailnet.com
Catalina smile and keel bolt corrosion hull
A crack at the forward keel-to-hull joint (the 'smile') is widely reported and can come from keel flex, fairing putty cracking or corroding keel bolts; a surveyor should check the bolts and joint.
forums.sailboatowners.com · cruisersforum.com · practical-sailor.com
Lower shroud chainplate reinforcement rigging
Lower chainplate attachments were beefed up after the first hulls; buyers of early boats should confirm the reinforcements are fitted.
practical-sailor.com
Rudder stock play steering
Practical Sailor found some play in the rudder stock on every boat examined; usually an annoyance rather than a danger.
practical-sailor.com
Leaking stanchions deck
Stanchions are through-bolted with washers rather than backing plates and can leak; the fasteners are easy to reach from inside for rebedding.
practical-sailor.com

1 more

Engine low in the bilge engine
The engine sits in the lowest part of the bilge under the settee, making it vulnerable to bilge water.
practical-sailor.com

Engines & parts

Universal Atomic 4 parts: good

Factory standard engine — you entered “Atomic 4 (Universal) 4-cyl gas”

Tens of thousands were built (sources say from 40,000 to 50,000). Despite being out of production for decades, the engine is well supported: Moyer Marine sells parts, rebuilt engines, fuel pump rebuilds and exhaust parts, and hosts an owners' forum; Old Lyme Marina and others also supply parts, and electronic ignition upgrades are available.

Parts sources: Moyer Marine

Common problems (3)

Raw-water cooling scale and corrosion cooling
Most Atomic 4s are raw-water cooled, so the block scales up and corrodes, especially in salt water; cranking without starting can also flood the engine with seawater through the exhaust.
goodoldboat.com · moyermarineforum.com · keelindex.com
Gasoline vapor fire/explosion risk fuel
Gasoline vapor is heavier than air and settles in the bilge, so ventilation, blower use and shutting the fuel valve (a stuck carburetor float can overflow) matter.
goodoldboat.com
Ignition and fuel system faults electrical
Points, condenser, cap and wires, plus gummed carburetors and contaminated fuel, are the most common reasons an Atomic 4 won't run well.
keelindex.com · goodoldboat.com

Maker’s service schedule (9)

Engine oil & filter change	50 hrs	“3. FIFTY HOUR CHECK a. Using sump pump, remove all oil from crankcase. Refill with a good grade oil as specified in Tabl” — manufacturer, westerbeke.com
Fuel filters & water separator	50 hrs	“e. Clean fuel pump strainer.” — manufacturer, westerbeke.com
Heat exchanger & oil cooler cleaning	50 hrs	“b. Inspect oil cooler and remove any accumulation of grit or dirt.” — manufacturer, westerbeke.com
Clean flame arrestor	100 hrs	“b. Inspect flame arrestor to be sure air passages are clean and free from oil. If dirty remove and wash with kerosene.” — manufacturer, westerbeke.com
Check clutch (reverse gear) adjustment	100 hrs	“4. ONE HUNDRED HOUR CHECK ... c. Check adjustment of clutch.” — manufacturer, westerbeke.com
Valve clearance check / adjust	150 hrs or 1 yr	“5. ONE HUNDRED FIFTY HOUR CHECK a. Check valve tappet adjustment.” — manufacturer, westerbeke.com
Spark plugs inspect / replace	150 hrs	“b. Remove, clean, and reset spark plugs.” — manufacturer, westerbeke.com
Transmission fluid change Universal V-drive unit (V-drive installations only; the standard reverse gear shares engine oil)	500 hrs	“(2) After the first 50 hours of operation, drain unit and refill ... (3) Change lubricant every 500 hours of operation.” — manufacturer, westerbeke.com
Complete overhaul	3,000 hrs	“At the end of three thousand hours of operation the engine should be completely overhauled.” — manufacturer, westerbeke.com

Service part numbers (8)

Oil filter optional add-on oil filter (not standard equipment)	Universal 276236	“2 Element or Cartridge 1 276236 (Oil Group, Oil Filter, Not Standard Equipment)” — manufacturer, westerbeke.com
Raw-water impeller Oberdorfer N202M-03 / N202M-07 replacement raw-water pump (Universal pump 295625)	Oberdorfer 6593	“5 Impeller 6593 6593 6593 6593 6593 1 (N202M, N202M-03, N202M-07 parts list)” — manufacturer, pumpsandpartsonline.com · “Impeller : Catalog # 6593, Impeller” — dealer, pumpagents.com
Raw-water pump kit Oberdorfer N202M-03 / N202M-07 raw-water pump	Oberdorfer 10725	“REPAIR KIT N202M N202M-03 N202M-07 10725” — manufacturer, pumpsandpartsonline.com · “Catalog # 10725, Repair Kit, includes O-Ring, Snap Ring, Impeller, 2 x Lip Seal” — dealer, pumpagents.com
Drive belt alternator belt (Prestolite and Motorola alternators)	Universal 239387	“19 Belt 1 239387 (12 Volt - Motorola 51 Amp Alternator)” — manufacturer, westerbeke.com
Spark plug	Universal 273276 × 4	“8 Spark plugs, champion 4 273276” — manufacturer, westerbeke.com
Thermostat late style, from 1967 / serial #79476 (Holley 145 F, on cylinder head)	Universal 200206	“12 Thermostat Kit 1 200206 consists of 262278 and 261601” — manufacturer, westerbeke.com
Thermostat Dole type, before serial #79476 (on manifold)	Universal 200207	“13 Kit, Thermostat (consists of 275965 & 261144) 1 200207” — manufacturer, westerbeke.com
Zinc / anode fresh-water-cooled engines only (Universal heat-exchanger kit)	Universal 299760	“23 zinc pencil 1 299760 (Cooling, Fresh Water System, after serial #79476)” — manufacturer, westerbeke.com

From the engine maker’s parts lists, or two independent parts dealers. Numbers change with serial number and get superseded — check yours before ordering.

Sources disagree on first year, last year, number built — left blank rather than guessed.

Universal M-12 / M-18 parts: good

Factory optional engine — you entered “Universal M-18 (2-cyl diesel)”

Marinized Kubota tractor engines; Universal/Westerbeke sells marine parts and Kubota dealers can supply base-engine parts if the Kubota block model/serial can be identified.

Parts sources: Westerbeke / Universal (factory parts store), Kubota USA parts lookup

Common problems (1)

Hard starting engine
Owners of M-18s ask how to make starting easier even after injector cleaning and with good batteries.
sailnet.com

Maker’s service schedule (7)

Engine oil & filter change	75 hrs or 1 yr	“Every 75 hours. At least once each season, or whichever comes first change engine oil and oil filter.” — manufacturer, c34.org
Fuel filters & water separator	100 hrs or 1 yr	“Every 100 hours. ... At least once each year, or whichever comes first change fuel oil filter and transmission oil.” — manufacturer, c34.org
Drive belts inspect / replace	100 hrs or 1 mo	“Every 100 hours. Or monthly, check V-belt tension. 1/2" deflection.” — manufacturer, c34.org
Raw-water pump impeller	1 yr	“Remove front cover of pump if system was drained for storage. Inspect rubber impeller, lightly lubricate pump impeller” — manufacturer, c34.org
Turn raw-water pump grease cup 1/2 turn	30 hrs	“Be sure water pump is lubricated by turning grease cup (if provided on your engine) clockwise 1/2 turn at 30 hour interv” — manufacturer, c34.org
Check mounts, cables, ground and fuel/water lines	100 hrs	“Check engine mounts bolts and lock nuts for looseness, and rubber for wear. ... Check all fuel and water lines for tight” — manufacturer, c34.org
Check engine/shaft alignment	1 yr	“Check engine and shaft alignment annually or if vibration is noticed during engine powering.” — manufacturer, c34.org

Service part numbers (13)

Oil filter	Universal 300209	“Filter, Lube Oil - 300209” — manufacturer, westerbeke.com · “Filter, Lube Oil - 300209” — manufacturer, legacy.marinepartsexpress.com
Fuel filter	Universal 298854	“Filter, Fuel Oil - 298854” — manufacturer, westerbeke.com · “5 298854 1 Fuel Filter Element” — manufacturer, legacy.marinepartsexpress.com
Electric fuel lift pump filter (with gasket)	Universal 300128	“Filter, Electric Lift - 300128” — manufacturer, westerbeke.com · “7 300128 1 Fuel Pump Filter & Gasket” — manufacturer, legacy.marinepartsexpress.com
Raw-water impeller New-style Sherwood sea water pump 302648 (no end cover plate)	Universal 302875	“Pump, Impeller - 302875” — manufacturer, westerbeke.com · “Pump, Impeller - 302875” — manufacturer, legacy.marinepartsexpress.com
Raw-water impeller Old-style Sherwood sea water pump	Universal 287439	“5 287439 1 Impeller” — manufacturer, westerbeke.com
Raw-water impeller Oberdorfer sea water pump (price book: impeller for pump 301357)	Universal 295628	“5 295628 1 Impeller” — manufacturer, westerbeke.com · “5 295628 1 Impeller” — manufacturer, legacy.marinepartsexpress.com
Raw-water pump kit Older sea water pump 295625 (per price book); not for the new-style Sherwood 302648, whose repair kit the fast-moving sheets give as N/A	Universal 298416	“298416 Pump Repair Kit” — manufacturer, westerbeke.com · “298416 KIT,WATER PUMP 295625” — manufacturer, hansenmarine.com
Drive belt M-18	Universal 300817	“Belt - 300817” — manufacturer, westerbeke.com
Drive belt M-18 with alternator 300800 (alternator group page)	Universal 300809	“6 300809 1 V-Belt” — manufacturer, westerbeke.com
Drive belt M-12	Universal 301073	“Belt - 301073” — manufacturer, legacy.marinepartsexpress.com · “301073 BELT,FAN 36.6 x O” — manufacturer, hansenmarine.com
Drive belt M2-12	Universal 302084	“Belt - 302084” — manufacturer, legacy.marinepartsexpress.com · “302084 BELT,FAN 36.3 x O” — manufacturer, hansenmarine.com
Air filter M-12 / M2-12 air cleaner 301926	Sources disagree: 301049 / 300429	“Air Filter Element - 301049” — manufacturer, legacy.marinepartsexpress.com · “25 300429 1 Filter Element” — manufacturer, legacy.marinepartsexpress.com
Zinc / anode	Universal 301069	“Zinc - 301069” — manufacturer, westerbeke.com · “14 301069 1 Zinc 1/8 NPT x 1 7/8 x 3/16 DIA.” — manufacturer, legacy.marinepartsexpress.com
Thermostat M-12 / M2-12	Universal 301358	“Thermostat Element - 301358” — manufacturer, legacy.marinepartsexpress.com · “301358 THERMOSTAT 160F” — manufacturer, hansenmarine.com
Thermostat M-18	Sources disagree: 300281 / 301358	“5 300281 1 Thermostat 160” — manufacturer, westerbeke.com · “Thermostat Element - 301358” — manufacturer, westerbeke.com

From the engine maker’s parts lists, or two independent parts dealers. Numbers change with serial number and get superseded — check yours before ordering.

Universal M-25 / M-25XP / M-25XPB parts: good

Factory standard engine — you entered “Universal M-25 (3-cyl diesel)”

Marinized Kubota blocks with plenty of parts support: the M-25 is based on the Kubota D850 and the M-25XP on the Kubota D950 (B7200 tractor engine), so many internal parts can be bought through Kubota/tractor channels for far less than marine prices. Kubota dealers need the block model/serial, which is often painted over, so cross-referencing can be hit or miss. Some marine parts (e.g., gear case cover) are no longer made.

Parts sources: Westerbeke / Universal (factory parts store), Kubota USA parts lookup

Common problems (2)

Discontinued marine parts and Kubota cross-reference engine
Owners struggle to cross Universal part numbers to Kubota numbers and find certain covers and marine-specific parts discontinued.
forums.sailboatowners.com · ericsonyachts.org
Repower fit questions engine
Owners of older Catalina 30s ask whether an M-25XP drops in; it generally fits but couplers and mounts may differ.
facebook.com

Maker’s service schedule (36)

Engine oil & filter change M-25 / M-25XP (owner manual 200157)	75 hrs or 1 yr	“Every 75 hours. At least once each season, or whichever comes first change engine oil and oil filter.” — manufacturer, c34.org
Fuel filters & water separator M-25 / M-25XP (owner manual 200157)	100 hrs or 1 yr	“Every 100 hours. ... At least once each year, or whichever comes first change fuel oil filter and transmission oil.” — manufacturer, c34.org
Drive belts inspect / replace M-25 / M-25XP (owner manual 200157)	100 hrs or 1 mo	“Every 100 hours. Or monthly, check V-belt tension. 1/2" deflection.” — manufacturer, c34.org
Raw-water pump impeller M-25 / M-25XP (owner manual 200157)	1 yr	“Remove front cover of pump if system was drained for storage. Inspect rubber impeller, lightly lubricate pump impeller” — manufacturer, c34.org
Turn raw-water pump grease cup 1/2 turn M-25 / M-25XP (owner manual 200157)	30 hrs	“Be sure water pump is lubricated by turning grease cup (if provided on your engine) clockwise 1/2 turn at 30 hour interv” — manufacturer, c34.org
Check mounts, cables, ground and fuel/water lines M-25 / M-25XP (owner manual 200157)	100 hrs	“Check engine mounts bolts and lock nuts for looseness, and rubber for wear. ... Check all fuel and water lines for tight” — manufacturer, c34.org
Check engine/shaft alignment M-25 / M-25XP (owner manual 200157)	1 yr	“Check engine and shaft alignment annually or if vibration is noticed during engine powering.” — manufacturer, c34.org
Engine oil & filter change M-25XPA / M-25XPA(C) (A-series, manual 200494)	250 hrs or 1 yr	“Initial engine oil and filter change at 50 hours, then change both every 250 hours.” — manufacturer, c34.org
Fuel filters & water separator M-25XPA / M-25XPA(C) (A-series, manual 200494)	250 hrs or 1 yr	“Initial change, then every 250 hours or once a year.” — manufacturer, c34.org
Transmission fluid change M-25XPA / M-25XPA(C) (A-series, manual 200494)	300 hrs or 1 yr	“Initial change, then at 300 hours or once a season.” — manufacturer, c34.org
Exhaust mixing elbow inspection M-25XPA / M-25XPA(C) (A-series, manual 200494)	250 hrs or 1 yr	“Initial check at 50 hours, then every 250 hours or once a year.” — manufacturer, c34.org
Engine pencil zincs M-25XPA / M-25XPA(C) (A-series, manual 200494)	100 hrs or 1 yr	“EVERY 100 OPERATING HOURS OR YEARLY ... Inspect and clean zinc anode. Note the condition, then determine your own schedu” — manufacturer, c34.org
Drive belts inspect / replace M-25XPA / M-25XPA(C) (A-series, manual 200494)	50 hrs or 1 mo	“EVERY 50 OPERATING HOURS OR MONTHLY ... Drive Belts: Inspect for proper tension” — manufacturer, c34.org
Raw-water pump impeller M-25XPA / M-25XPA(C) (A-series, manual 200494)	50 hrs or 1 mo	“EVERY 50 OPERATING HOURS OR MONTHLY ... Raw Water Pump: Inspect impeller, check drive shaft security.” — manufacturer, c34.org
Air filter / intake silencer M-25XPA / M-25XPA(C) (A-series, manual 200494)	100 hrs or 1 yr	“EVERY 100 OPERATING HOURS OR YEARLY ... Air Intake Filter: Remove and clean filter, replace if contaminated.” — manufacturer, c34.org
Coolant replacement & freeze-point test M-25XPA / M-25XPA(C) (A-series, manual 200494)	500 hrs or 5 yrs	“EVERY 500 OPERATING HOURS OR FIVE YEARS ... Coolant System: Drain, flush and re-fill the cooling system” — manufacturer, c34.org
Valve clearance check / adjust M-25XPA / M-25XPA(C) (A-series, manual 200494)	500 hrs or 5 yrs	“EVERY 500 OPERATING HOURS OR FIVE YEARS ... *Valve Clearances: Adjust valves.” — manufacturer, c34.org
Injector test / service M-25XPA / M-25XPA(C) (A-series, manual 200494)	500 hrs or 5 yrs	“EVERY 500 OPERATING HOURS OR FIVE YEARS ... *Fuel Injectors: Check and adjust injection opening pressure and spray condi” — manufacturer, c34.org
Heat exchanger & oil cooler cleaning M-25XPA / M-25XPA(C) (A-series, manual 200494)	1,000 hrs or 5 yrs	“EVERY 1000 OPERATING HOURS OR EVERY FIVE YEARS ... *Heat Exchanger: Remove the heat exchanger for professional cleaning” — manufacturer, c34.org
Clean glow plugs / check preheat M-25XPA / M-25XPA(C) (A-series, manual 200494)	500 hrs or 5 yrs	“*Preheat Circuit: Check operation of the pre-heat. Remove and clean the glow plugs.” — manufacturer, c34.org
Check engine/shaft alignment M-25XPA / M-25XPA(C) (A-series, manual 200494)	500 hrs or 5 yrs	“*Engine/Shaft Alignment: Check security of the shaft coupling and check shaft alignment.” — manufacturer, c34.org
Inspect transmission damper plate M-25XPA / M-25XPA(C) (A-series, manual 200494)	1,000 hrs or 5 yrs	“*Transmission Damper Plate: Inspect the damper plate, replace if necessary” — manufacturer, c34.org
Fuel filters & water separator M-25XPB / M-25XPB(C) (B-series, manual 200550)	250 hrs or 1 yr	“Initial change, then every 250 hours or once a year.” — manufacturer (rev 3, Aug 2015), c34.org
Transmission fluid change M-25XPB / M-25XPB(C) (B-series, manual 200550)	300 hrs or 1 yr	“Initial change, then at 300 hours or once a season.” — manufacturer (rev 3, Aug 2015), c34.org
Exhaust mixing elbow inspection M-25XPB / M-25XPB(C) (B-series, manual 200550)	250 hrs or 1 yr	“Initial check at 50 hours, then every 250 hours or once a year.” — manufacturer (rev 3, Aug 2015), c34.org
Engine pencil zincs M-25XPB / M-25XPB(C) (B-series, manual 200550)	50 hrs or 1 mo	“EVERY 50 OPERATING HOURS OR MONTHLY ... Zinc Anode: Inspect and clean zinc anode. Replace if necessary.” — manufacturer (rev 3, Aug 2015), c34.org
Drive belts inspect / replace M-25XPB / M-25XPB(C) (B-series, manual 200550)	50 hrs or 1 mo	“EVERY 50 OPERATING HOURS OR MONTHLY ... Drive Belt: Inspect for proper tension” — manufacturer (rev 3, Aug 2015), c34.org
Raw-water pump impeller M-25XPB / M-25XPB(C) (B-series, manual 200550)	100 hrs or 1 yr	“EVERY 100 OPERATING HOURS OR YEARLY ... Raw Water Pump: Inspect impeller, check drive shaft security.” — manufacturer (rev 3, Aug 2015), c34.org
Air filter / intake silencer M-25XPB / M-25XPB(C) (B-series, manual 200550)	100 hrs or 1 yr	“EVERY 100 OPERATING HOURS OR YEARLY ... Air Intake Filter: Inspect, clean and replace as needed.” — manufacturer (rev 3, Aug 2015), c34.org
Coolant replacement & freeze-point test M-25XPB / M-25XPB(C) (B-series, manual 200550)	500 hrs or 1 yr	“EVERY 500 OPERATING HOURS OR YEARLY ... Coolant System: Drain, flush and re-fill the cooling system” — manufacturer (rev 3, Aug 2015), c34.org
Valve clearance check / adjust M-25XPB / M-25XPB(C) (B-series, manual 200550)	500 hrs or 1 yr	“EVERY 500 OPERATING HOURS OR YEARLY ... *Valve Clearances: Adjust valves.” — manufacturer (rev 3, Aug 2015), c34.org
Injector test / service M-25XPB / M-25XPB(C) (B-series, manual 200550)	500 hrs or 1 yr	“*Fuel Injectors: Check and adjust injection opening pressure and spray conditions.” — manufacturer (rev 3, Aug 2015), c34.org
Heat exchanger & oil cooler cleaning M-25XPB / M-25XPB(C) (B-series, manual 200550)	1,000 hrs or 5 yrs	“EVERY 1000 OPERATING HOURS OR OR EVERY FIVE YEARS ... *Heat Exchanger: Remove the heat exchanger for professional cleani” — manufacturer (rev 3, Aug 2015), c34.org
Clean glow plugs / check preheat M-25XPB / M-25XPB(C) (B-series, manual 200550)	500 hrs or 1 yr	“*Preheat Circuit: Check operation of the pre-heat. Remove and clean the glow plugs.” — manufacturer (rev 3, Aug 2015), c34.org
Check engine/shaft alignment M-25XPB / M-25XPB(C) (B-series, manual 200550)	500 hrs or 1 yr	“Engine/Shaft Alignment: Check security of the shaft coupling and check shaft alignment.” — manufacturer (rev 3, Aug 2015), c34.org
Inspect transmission damper plate M-25XPB / M-25XPB(C) (B-series, manual 200550)	1,000 hrs or 5 yrs	“*Transmission Damper Plate: Inspect the damper plate, replace if necessary” — manufacturer (rev 3, Aug 2015), c34.org

Service part numbers (19)

Oil filter	Universal 300209	“Filter, Lube Oil - 300209” — manufacturer, westerbeke.com · “300209 FILTER,OIL” — manufacturer, hansenmarine.com
Fuel filter	Universal 298854	“Filter, Fuel Oil - 298854” — manufacturer, westerbeke.com · “298854 FILTER,FUEL” — manufacturer, hansenmarine.com
Electric fuel lift pump filter (with gasket)	Universal 300128	“Filter, Electric Lift - 300128” — manufacturer, westerbeke.com · “300128 FILTER,FUEL WITH GASKET” — manufacturer, hansenmarine.com
Optional primary fuel filter / water separator (Westerbeke accessory)	Universal 032974	“5 032974 FILTER PRIMARY FUEL SEPERATOR 1” — manufacturer, westerbeke.com
Raw-water impeller New-style Sherwood sea water pump 302648 (M-25 / M-25XP)	Universal 302875	“Pump, Impeller - 302875” — manufacturer, westerbeke.com · “302875 IMPELLER,PUMP 302648” — manufacturer, hansenmarine.com
Raw-water impeller Old Sherwood sea water pump 300986 (M-25)	Universal 287439	“5 287439 1 Impeller” — manufacturer, westerbeke.com
Raw-water impeller Oberdorfer sea water pump 301357 (M-25)	Universal 295628	“5 295628 1 Impeller” — manufacturer, westerbeke.com · “295628 IMPELLER,PUMP 301357” — manufacturer, hansenmarine.com
Raw-water impeller Impeller kit, raw water pump 042175 (M-25XPB); price book says it also fits pump 302648	Universal 200175	“6 200175 IMPELLER KIT INCLUDES REF #'S 5,6 & 8 1” — manufacturer, westerbeke.com · “200175 IMPELLER KIT 302648 - 42175 PUMP” — manufacturer, hansenmarine.com
Raw-water pump kit Raw water pump 042175 (M-25XPB); price book says it also fits pump 302648	Universal 200176	“30 200176 PUMP KIT REBUILD 1” — manufacturer, westerbeke.com · “200176 KIT,WATER PUMP 302648 - 42175” — manufacturer, hansenmarine.com
Drive belt M-25 (5421 / M-25, 1978-1986)	Universal 300805	“Belt - 300805” — manufacturer, westerbeke.com · “300805 BELT,FAN 41.6 x O” — manufacturer, hansenmarine.com
Drive belt M-25XP	Universal 300817	“Belt - 300817” — manufacturer, westerbeke.com
Drive belt M-25 fitted with the alternator mount conversion kit	Universal 302190	“16 302190 1 V-Belt M25” — manufacturer, westerbeke.com · “302190 BELT,FAN 39.6 x O” — manufacturer, hansenmarine.com
Drive belt M-25XPB	Universal 030475	“9 030475 BELT FAN, 39.5 X0 1” — manufacturer, westerbeke.com · “30475 BELT,FAN 39.5 x O” — manufacturer, hansenmarine.com
Air filter	Universal 301049	“Air Filter Element - 301049” — manufacturer, westerbeke.com
Zinc / anode M-25 / M-25XP with 2-inch diameter heat exchanger	Universal 301069	“Zinc - 301069 (I) ... 301069 ZINC IS USED ON 2" DIAMETER HEAT EXCHANGERS.” — manufacturer, westerbeke.com
Zinc / anode M-25XP with 3-inch diameter heat exchanger	Universal 301068	“301069 FOR 2" DIAMETER EXCHANGER OR 301068 FOR 3" DIAMETER EXCHANGER.” — manufacturer, westerbeke.com · “301068 ZINC 3/8NPT x 1-1/4” — manufacturer, hansenmarine.com
Zinc / anode M-25XPB	Universal 011885	“17 011885 ZINC 1” — manufacturer, westerbeke.com · “Westerbeke 011885 Zinc anode” — dealer, westerbeke.com.au
Thermostat M-25, M-25XP, and M-25XPB to March 1998 (38 mm OD)	Universal 301358	“Thermostat Element - 301358 (H) ... THERMOSTAT IS 160 deg.” — manufacturer, westerbeke.com
Thermostat M-25XPB from March 1998 (44 mm OD)	Universal 201001	“13-2 201001 THERMOSTAT 160F - 44 MM OD FROM MAR 1998 1” — manufacturer, westerbeke.com · “201001 THERMOSTAT 160F” — manufacturer, hansenmarine.com

From the engine maker’s parts lists, or two independent parts dealers. Numbers change with serial number and get superseded — check yours before ordering.

Steering

Edson — Pedestal chain-and-wire steering parts: good

Edson (New Bedford, MA) still sells service parts: chain-and-wire kits, sprockets, idlers, pull-pull conduit steering and internal pedestal parts, and keeps steering data sheets by boat model, many decades old.

Parts sources: Edson Marine (service parts)

Common problems (3)

Old or slack steering wire steering
Edson advises replacing steering wire about every five years, checking tension with the wheel locked, and inspecting under load annually; owners often find decades-old stiff wire.
usna.edu · youtube.com
Lubrication and fastener checks steering
Chain, wire, sheaves and pedestal bearings need regular oiling or greasing, and clevis/cotter pins and bolts should be checked monthly to avoid failures.
usna.edu
Replacing engine control cables in the pedestal steering
Swapping throttle/shift cables inside an Edson pedestal is a common owner job requiring removal of the wheel shaft sprocket pin.
forums.sailboatowners.com

Edson — Traditional geared steerers (worm / rack-and-pinion) parts: good

Edson says its traditional wheels and geared steerers are still available, now built with modern materials; rack-and-pinion steerers are offered for transom-hung and inboard rudders.

Parts sources: Edson Marine (traditional steerers)

Model sources (17)

sailboatdata.com · practical-sailor.com · forums.sailboatowners.com · cruisersforum.com · sailnet.com · catalinadirect.com · catalinayachts.com · catalinayachts.com · catalina30.com · forums.sailboatowners.com · soundmarinediesel.com · catalina30.com · snugharborboats.com · wheltonmarine.com · sbo.sailboatowners.com · easternyachtsales.com · catalina30.com

Other Catalina models

Catalina 22 1969–?
Catalina 25 1976–?
Catalina 27 1970–1991
Catalina 320 1993–?
Catalina 34 1985–?
Catalina 36 1982–?
Catalina 380 1996–?
Catalina 400 1994–?
Catalina 42 1989–2011

Researched from public sources. Spotted an error? The sources are listed above — tell us what they got wrong.