DeFever 49 Pilothouse (soft chine)

Built 1977–2006 by CTF Marine (Taiwan)

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About the DeFever 49 Pilothouse (soft chine)

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

Illustration of a DeFever 49 Pilothouse (soft chine) — **Illustration, not a photo of this model.** AI-generated illustration of a typical twin-engine flybridge trawler.

Built: 1977–2006
Builder: CTF Marine (Taiwan)
Designer: Arthur DeFever
Length: 49.75 ft
Waterline: 43.75 ft
Beam: 15 ft
Draft: 4.5 ft
Displacement: 50,000 lb
Hull / keel: semi-displacement
Propulsion: inboard
Fuel: 1,000 gal
Water: 400 gal
Holding: 70 gal

Tank capacities — where the figures come from

Fuel 1,000 gal
“1000 gallons | 3785L | (2) 150 gallon and (2) 350-gallon tanks” — broker listing (2001), defever49forsale.com · “Fuel: 1000 gallons” — search excerpt (1988), cruisersforum.com

Two for-sale boats, from 1988 and 2001, both carry 1,000 gal, the 2001 boat in four tanks. There's no builder or owners' club figure; the DeFever Cruisers page for the 49 Pilothouse gives none.
Water 400 gal
“300 gallons | 1135L | (3) tanks, HDPE plastic” — broker listing (2001), defever49forsale.com

One 2001 listing shows 300 gal in three plastic tanks, possibly replacements; a single listing isn't enough to change our earlier figure of 400.
Holding 70 gal
“80 gallons | 302L one fiberglass tank” — broker listing (2001), defever49forsale.com

One listing says 80 gal, against the 70 shown; no builder figure was found to settle it.
Water heater unknown
The DeFever Cruisers design page and an owner-insights article give no heater details.

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
“Wesmar hydraulic bow thruster” — broker listing (1984), curtisstokes.net · “a bow thruster allows easy maneuverability while docking.” — search excerpt, waterlineboats.com

Two boats are shown with bow thrusters (one a 1984 boat with a Wesmar hydraulic unit alongside Wesmar stabilizers), but neither says whether it was factory-fitted or added, and no builder list was found. Wesmar appears on one listing only.
Stern thruster unknown
“Wesmar electric stern thruster (2021)” — broker listing (1984), curtisstokes.net

The one stern thruster seen was added in 2021.
Steering unknown
“Teleflex Capilano hydraulic steering system” — broker listing (1984), curtisstokes.net

Only one broker listing (a 1984 raised pilothouse) describes the steering, as Teleflex Capilano hydraulic, which isn't enough to set a type or brand.

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

Raised-pilothouse cruiser with master stateroom under the pilothouse. A separate DeFever 49 Pilothouse with hard chines was built by Sen Koh; the CTF boat has rounded aft chines and a lower flybridge. Twin 135 hp Lehmans cruise 7-8 knots.

Engines fitted

Ford Lehman 120 (2715E) — 120 hp, diesel, twin standard
Seen on early-1980s hulls, e.g. a 1983 RPH with twin Lehman 120s.

Sources: sysyachtsales.com
Ford Lehman Super 135 — 135 hp, diesel, twin standard
The most common installation per PassageMaker and owners; a 1988 hull lists twin Lehman Super 135s.

Sources: passagemaker.com · trawlerforum.com · curtisstokes.net
Perkins 135 hp — 135 hp, diesel, twin factory option
PassageMaker lists Perkins 135s among the variations; an owner says most 49 RPHs came with twin 135 hp Lehman or Perkins. Boats were often built to owner spec.

Sources: passagemaker.com · trawlerforum.com
Caterpillar 3208 — diesel, twin factory option
Rare: PassageMaker notes at least one boat built with a pair of Cat 3208s.

Sources: passagemaker.com
John Deere 6068TFM50 — 225 hp, diesel, twin factory option
An owner reports John Deere 6068s were offered around 2000 and were popular on late boats; his has 225 hp 6068TFM50s.

Sources: trawlerforum.com
John Deere 6068 — diesel, twin common repower
Owners on Trawler Forum say many older 49s have been repowered with John Deere 6068s.

Sources: trawlerforum.com

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

Generator

Listings vary: a 1984 boat with two Onans (9 kW and 8 kW), a 1991 boat with a Westerbeke 8 kW. No two boats with the same make and size; no builder or review statement found.

Known problems for this model

No well-sourced problem reports found yet.

Engines & parts

Ford Lehman 120 (6D380 / 2715E) parts: good

Factory standard engine — you entered “Ford Lehman 120 (2715E)”

Marinized by Lehman from the Ford of England 'Dorset' 2715E six-cylinder (380 cu in) industrial/truck diesel; Ford built the Dorset base engines 1964–1984. Base-engine internals interchange with the Ford 2715E, and marine-specific parts (raw water pumps, heat exchangers, injection elbows, gaskets, lift pumps, air filters) are widely stocked. American Diesel Corp (founded by former Lehman people) still sells parts, publishes spare-parts lists and gives technical advice. Rebuilt and used 120s are also sold by salvage yards.

Parts sources: American Diesel Corp, Go2marine (Ford Lehman parts collection), Fred Warner Marine & Outdoors

Common problems (2)

Chronic oil leaks engine
Most 120s weep oil somewhere; owners often trace it to the rear of the engine near the heat exchanger (head/head gasket area) or to the drive seals of the gear-driven injection pump. Moderate oil use is treated as normal on these engines.
trawlerforum.com · marineengine.com
Fuel leaks at injection pump, lift pump and return lines fuel
Slow diesel drips usually come from loose bleed screws or banjo washers, perished rubber injector return hoses, a failing lift-pump diaphragm, or worn internal seals in the Simms or CAV injection pump, which needs a pump shop to overhaul.
yescenters.com

Maker’s service schedule (16)

Engine oil & filter change	200 hrs	“After first 15 hours running .... 1. Change Engine Oil ... Every 200 hours running ..... 17. Change engine and transmiss” — manufacturer (1986), marinedieselbasics.com
Fuel filters & water separator	200 hrs	“Every 200 hours running ..... 18. Change all engine and fuel oil filters.” — manufacturer (1986), marinedieselbasics.com
Change oil in fuel injection pump	50 hrs	“Every 50 hours running ...... 13. Check cleanliness of intake air filter. 14. Check (exchanger) zinc pencil. 15. Change” — manufacturer (1986), marinedieselbasics.com
Transmission fluid change	200 hrs or 1 yr	“Change oil every 200 hours of operation or at least once each season under normal conditions” — manufacturer (1986), marinedieselbasics.com
Valve clearance check / adjust	400 hrs	“After first 15 hours running .... 3. Adjust valve clearances. ... Every 400 hours running ..... 22. Adjust valve clearan” — manufacturer (1986), marinedieselbasics.com
Injector test / service	400 hrs	“Every 400 hours running ..... 21. Remove and service injectors.” — manufacturer (1986), marinedieselbasics.com
Engine pencil zincs	50 hrs	“After first 15 hours running .... 4. Check (exchanger) zinc pencil. ... Every 50 hours running ...... 14. Check (exchang” — manufacturer (1986), marinedieselbasics.com
Drive belts inspect / replace	200 hrs	“After first 15 hours running .... 5. Adjust belt tension. ... Every 200 hours running ..... 16. Adjust belt tension.” — manufacturer (1986), marinedieselbasics.com
Air filter / intake silencer	50 hrs	“After first 15 hours running .... 8. Check cleanliness of intake air filter. ... Every 50 hours running ...... 13. Check” — manufacturer (1986), marinedieselbasics.com
Clean fuel lift pump	200 hrs	“Every 200 hours running ..... 19. Clean fuel lift pump.” — manufacturer (1986), marinedieselbasics.com
Clean injection pump cover filter	200 hrs	“Every 200 hours running ..... 20. Clean injection pump cover filter.” — manufacturer (1986), marinedieselbasics.com
Remove raw water pump and check drive coupling	400 hrs	“Every 400 hours running ..... 23. Remove raw water pump and check drive coupling. Place dab of grease on coupling halves” — manufacturer (1986), marinedieselbasics.com
Adjust idling speed (if required)	400 hrs	“After first 15 hours running .... 10. Adjust idling speed (if required). ... Every 400 hours running ..... 24. Adjust id” — manufacturer (1986), marinedieselbasics.com
Check engine/propeller shaft alignment	6 mo	“After first 15 hours running .... 9. Check engine/propeller shaft alignment. (twice annually, minimum).” — manufacturer (1986), marinedieselbasics.com
Replace Borg Warner transmission oil cooler	1,200 hrs	“Suggested replacement is at 1200 hours.” — manufacturer, img1.wsimg.com
Inspect drive damper	2,500 hrs	“Inspect your drive damper if you have more than 2500 hours on the engine.” — manufacturer, img1.wsimg.com

Service part numbers (3)

Raw-water impeller	Jabsco 1210-0001	“6D380 5850-0001 040 3/4" NPT Flange SK33 3298 1210-0001” — manufacturer, marineengine.com · “Breakdown of 2C48 Pump ... 9 1 1210-0001 IMPELLER” — manufacturer, marinesurveyorontario.com
Raw-water pump kit original 2C45 pump (Jabsco 5850-0001)	Jabsco SK33	“6D380 5850-0001 040 3/4" NPT Flange SK33 3298 1210-0001” — manufacturer, marineengine.com
Raw-water pump kit Lehman 2C48 replacement pump (Jabsco 10950-2401 type)	Jabsco SK239	“Service Kit SK239 - Comprising Key 7/8/9/17” — manufacturer, marinesurveyorontario.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.

Ford Lehman 135 / SP135 (2725E) parts: good

Factory standard engine — you entered “Ford Lehman Super 135”

Based on the later Ford 'Dover' 2725E 6.2 L naturally aspirated six (Ford built the Dover series 1982–1994, then Otosan/Dovertech to 2005). Parts are sold by the same Lehman specialists as the 120; American Diesel lists spare-parts sheets and Go2marine stocks cooling parts, heat exchangers and elbows for the 135. Do not assume 120 (2715E) and 135 (2725E) internals interchange.

Parts sources: American Diesel Corp, Go2marine (Ford Lehman parts collection)

Maker’s service schedule (14)

Engine oil & filter change	200 hrs	“Every 200 hours of operation ..... Change Engine Oil & Filter. And Transmission Oil.” — manufacturer (1987), marinedieselbasics.com
Fuel filters & water separator	200 hrs or 1 yr	“should be replaced once each season or at least each 200 hours (which ever comes first) under normal conditions” — manufacturer (1987), marinedieselbasics.com
Raw-water pump impeller	200 hrs	“Every 200 hours of operation ..... Replace raw water pump impeller.” — manufacturer (1987), marinedieselbasics.com
Coolant replacement & freeze-point test	1,200 hrs	“Every 1200 hours of operation ..... Flush cooling system. Replace anti-freeze.” — manufacturer (1987), marinedieselbasics.com
Exhaust mixing elbow inspection	200 hrs	“Every 200 hours of operation ..... Check exhaust components for leaks.” — manufacturer (1987), marinedieselbasics.com
Transmission fluid change Borg Warner gearbox	200 hrs or 1 yr	“Change oil every 200 hours of operation or at least once each season under normal conditions” — manufacturer (1987), marinedieselbasics.com
Transmission fluid change PRM/Newage gearbox	200 hrs	“After 25 hours running: Drain all oil from the gearbox and refill with one of the recommended lubricants.” — manufacturer (1987), marinedieselbasics.com
Transmission fluid change Twin Disc gearbox	1,000 hrs or 6 mo	“The period between oil changes is 1000 hours of operation or 6 months, whichever occurs first.” — manufacturer (1987), marinedieselbasics.com
Check idling speed	200 hrs	“Every 200 hours of operation ..... Check idling speed, adjust if required.” — manufacturer (1987), marinedieselbasics.com
Check coolant and oil hoses	200 hrs	“Every 200 hours of operation ..... Check condition of all coolant and oil hoses.” — manufacturer (1987), marinedieselbasics.com
Check engine mount bolts	200 hrs	“Every 200 hours of operation ..... Check all engine mount bolts.” — manufacturer (1987), marinedieselbasics.com
Replace thermostats	3,600 hrs	“Every 3600 hours of operation ..... Replace thermostats.” — manufacturer (1987), marinedieselbasics.com
Replace Borg Warner transmission oil cooler Borg Warner gearbox	1,200 hrs	“Suggested replacement time is at 1200 hours.” — manufacturer, img1.wsimg.com
Inspect drive damper	2,500 hrs	“Inspect your drive damper if you have more than 2500 hours on the engine.” — manufacturer, img1.wsimg.com

Service part numbers (9)

Oil filter engines built before the 1987 change (original filter)	Lehman 2N50	“11 1 2N50 FILTER (Engine Oil Cooler Assembly D196/D197, SP90 / 135)” — manufacturer, marinesurveyorontario.com
Oil filter 1987-on engines (larger capacity, revised fitment)	Lehman 2N53	“DURING 1987 A NEW OIL FILTER OF LARGER CAPACITY ... THIS IS PART No. 2N53” — manufacturer, marinesurveyorontario.com · “Oil Filter 2N53 LM - P12-R105 P11-88” — dealer, lancingmarine.com
Fuel filter	Ford 6149717 × 2	“2 ALL 2 6149717 FUEL FILTER ELEMENTS” — manufacturer, marinesurveyorontario.com
Raw-water impeller	Jabsco 1210-0001	“Breakdown of 2C48 Pump ... 9 1 1210-0001 IMPELLER” — manufacturer, marinesurveyorontario.com
Raw-water pump kit	Jabsco SK239	“Service Kit SK239 - Comprising Key 7/8/9/17” — manufacturer, marinesurveyorontario.com
Drive belt	Lehman 2B209	“15 1 2B209 VBELT (Alternator Assembly D144, M/N)” — manufacturer, marinesurveyorontario.com · “Alternator Accessory Drive V-Belt 2B209 2B209 - P11-51” — dealer, lancingmarine.com
Air filter	Lehman 1F7	“12 1 1F7 FOAM ELEMENT (Plenum Chamber / Air Filter Assembly D1125, SP135)” — manufacturer, marinesurveyorontario.com · “Air strainer to replace 2H75 & 1F7 (PF136) (Whilst stocks last)” — dealer, lancingmarine.com
Zinc / anode	Lehman EM21A	“25A 1 EM21A ZINC ANODE (Heat Exchanger Assembly D882/D883, SP135)” — manufacturer, marinesurveyorontario.com · “Anodes EM21A (Pack of 5) - - P11-18” — dealer, lancingmarine.com
Thermostat	Lehman 2C35	“11 1 2C35 THERMOSTAT ... Modified / 12 1 1541317 GASKET” — manufacturer, marinesurveyorontario.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.

Caterpillar 3208 (NA / T / TA) parts: good

Factory optional engine — you entered “Caterpillar 3208”

V8 introduced in the 1970s and discontinued in the late 1990s (Big Bear Engine gives 1999). Naturally aspirated versions run about 210 hp; turbo and turbo-aftercooled versions go up to 435 hp. Cat dealers still supply many genuine parts by serial number, and aftermarket in-frame/overhaul kits (pistons, rings, liners, bearings) are sold by Diesel Pro Power, Highway and Heavy Parts and others; complete remanufactured long blocks are also sold. The block is unsleeved from the factory but can be bored and sleeved during a rebuild.

Parts sources: Diesel Pro Power, Highway and Heavy Parts (Cat 3208), Big Bear Engine Company (3208 long blocks)

Common problems (3)

Aftercooler failure flooding the engine (TA models) cooling
The seawater-cooled aftercooler on turbo-aftercooled 3208s has aluminum parts that corrode; a failure can let seawater into the cylinders. Owners pull, clean, grease and pressure-test aftercoolers every 2–3 years and some replace them on a fixed schedule.
trawlerforum.com · forums.ybw.com
Short life at high ratings / overloading engine
The higher-rated 3208TA engines last longer when run well below full power and propped so they can reach rated rpm; overheating or running at full load continuously shortens life.
trawlerforum.com · trawlerforum.com
Overheating at high throttle cooling
Common causes owners check are clogged heat exchangers, thermostats, fouled keel coolers or restricted raw water flow, and faulty temperature senders.
justanswer.com · facebook.com

Maker’s service schedule (20)

Engine oil & filter change	250 hrs or 1 yr	“Every 9000 L (2400 US gal) of Fuel or 250 Service Hours or Yearly ... Engine Oil and Filter - Change” — manufacturer, princessklubben.se
Fuel filters & water separator	250 hrs or 1 yr	“Every 9000 L (2400 US gal) of Fuel or 250 Service Hours or Yearly ... Fuel System Primary Filter/Water Separator Element” — manufacturer, princessklubben.se
Raw-water pump impeller	250 hrs or 1 yr	“Every 9000 L (2400 US gal) of Fuel or 250 Service Hours or Yearly ... Auxiliary Water Pump - Inspect” — manufacturer, princessklubben.se
Engine pencil zincs	50 hrs	“Every 1900 L (500 US gal) of Fuel or 50 Service Hours ... Zinc Rods - Inspect/Replace” — manufacturer, princessklubben.se
Air filter / intake silencer	250 hrs or 1 yr	“Every 9000 L (2400 US gal) of Fuel or 250 Service Hours or Yearly ... Engine Air Cleaner Element - Clean/Replace” — manufacturer, princessklubben.se
Valve clearance check / adjust	2,000 hrs	“Initial 9000 L (2400 US gal) of Fuel or 250 Service Hours or 1 Year ... Engine Valve Lash - Inspect/Adjust” — manufacturer, princessklubben.se
Coolant replacement & freeze-point test Cat DEAC / conventional coolant	1,000 hrs or 2 yrs	“Every 36 000 L (9000 US gal) of Fuel or 1000 Service Hours or 2 Years ... Cooling System Coolant (DEAC) - Change” — manufacturer, princessklubben.se
Coolant replacement & freeze-point test Cat ELC (extended life coolant)	6,000 hrs or 4 yrs	“Every 216 000 L (57 000 US gal) of Fuel or 6000 Service Hours or 4 Years ... Cooling System Coolant (ELC) - Change” — manufacturer, princessklubben.se
Turbocharger inspection	1,000 hrs or 2 yrs	“Every 36 000 L (9000 US gal) of Fuel or 1000 Service Hours or 2 Years ... Aftercooler Core - Clean/Test” — manufacturer, princessklubben.se
Turbocharger inspect	2,000 hrs	“Every 72 000 L (19 000 US gal) of Fuel or 2000 Service Hours ... Turbocharger - Inspect” — manufacturer, princessklubben.se
Heat exchanger & oil cooler cleaning	2,000 hrs	“Every 72 000 L (19 000 US gal) of Fuel or 2000 Service Hours ... Heat Exchanger - Inspect” — manufacturer, princessklubben.se
Injector test / service	2,000 hrs	“Every 72 000 L (19 000 US gal) of Fuel or 2000 Service Hours ... Fuel Injection Nozzles - Test/Exchange” — manufacturer, princessklubben.se
Sea water strainer clean/inspect	250 hrs or 1 yr	“Every 9000 L (2400 US gal) of Fuel or 250 Service Hours or Yearly ... Sea Water Strainer - Clean/Inspect” — manufacturer, princessklubben.se
Coolant SCA test/add	250 hrs or 1 yr	“Every 9000 L (2400 US gal) of Fuel or 250 Service Hours or Yearly ... Cooling System Supplemental Coolant Additive (SCA)” — manufacturer, princessklubben.se
Hoses and clamps inspect/replace	250 hrs or 1 yr	“Every 9000 L (2400 US gal) of Fuel or 250 Service Hours or Yearly ... Hoses and Clamps - Inspect/Replace” — manufacturer, princessklubben.se
Crankcase breather clean	250 hrs or 1 yr	“Every 9000 L (2400 US gal) of Fuel or 250 Service Hours or Yearly ... Engine Crankcase Breather - Clean” — manufacturer, princessklubben.se
Thermostat (water temperature regulator) replace	1,000 hrs or 2 yrs	“Every 36 000 L (9000 US gal) of Fuel or 1000 Service Hours or 2 Years ... Cooling System Water Temperature Regulator - R” — manufacturer, princessklubben.se
Marine transmission oil cooler clean/inspect	1,000 hrs or 2 yrs	“Every 36 000 L (9000 US gal) of Fuel or 1000 Service Hours or 2 Years ... Marine Transmission Oil Cooler - Clean/Inspect” — manufacturer, princessklubben.se
Crankshaft vibration damper inspect	2,000 hrs	“Every 72 000 L (19 000 US gal) of Fuel or 2000 Service Hours ... Crankshaft Vibration Damper - Inspect” — manufacturer, princessklubben.se
Jacket water pump inspect	3,000 hrs or 2 yrs	“Every 108 000 L (28 500 US gal) of Fuel or 3000 Service Hours or 2 Years ... Water Pump - Inspect” — manufacturer, princessklubben.se

Service part numbers (4)

Fuel filter	Caterpillar 1R-0750	“\| Fuel Filter \| 1R0750 \|” — dealer, marineenergy.com.au · “Fuel Filter for Caterpillar 3208 Natural and Turbo engines 1R0750 Advanced Efficiency” — dealer, dieselpro.com
Zinc / anode heat-exchanger anode (10 mm); 2 on the 4W-9164 heat exchanger, 3 on the 7C-3114 heat exchanger	Caterpillar 6L-2283	“\| Anodes on 7C-3114 Heat Exchanger \| 6L-2283 \| [CM6L2283] x 3.” — dealer, marineenergy.com.au · “Zinc Anode for Caterpillar Marine Engines 6L2283 NPT: 1/4”” — dealer, dieselpro.com
Zinc / anode 16 mm anode, starboard bottom of bonnet, 4W-9164 heat exchanger only	Caterpillar 6L-2289	“Anodes on 4W-9164 Heat Exchanger \| 6L-2283 6L-2289 ... [TEC 02023] x 1. Starboard Side, bottom of the bonnet. 16mm” — dealer, marineenergy.com.au · “Zinc Anode for Caterpillar Marine Engines 6L2289 NPT: 1/2”” — dealer, dieselpro.com
Zinc / anode transmission oil cooler anode (if the cooler has one)	Caterpillar 6L-2288	“\| Anode - Transmission Oil Cooler (If present on cooler) \| 6L-2288 \|” — dealer, marineenergy.com.au · “Zinc Anode for Caterpillar Marine Engines 6L2288 NPT: 1/2”” — dealer, dieselpro.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 horsepower — left blank rather than guessed.

John Deere 4045 / 6068 (marine) parts: good

Factory optional engine — you entered “John Deere 6068TFM50”

Huge agricultural/industrial population and a wide Deere dealer network keep base-engine parts easy to get; marinization parts vary by who marinized the engine (Deere, Lugger/Northern Lights, etc.). Industrial 6068s have run tens of thousands of hours without head removal.

Parts sources: RPM Diesel (Northern Lights/Lugger/Deere parts)

Common problems (3)

Low-load operation engine
Long periods at very low load can glaze cylinders; owners are advised to keep engines at operating temperature and run them up periodically.
mvdirona.com
Oil leaks at filter supply tube O-rings engine
A recurring 6068 question is oil leaking from O-rings on the oil filter supply tubes.
facebook.com
Electronic throttle/sensor faults (4045T) fuel
Electronically controlled 4045s can buck and smoke under throttle from sensor problems.
downeastboatforum.com

Maker’s service schedule (17)

Engine oil & filter change	250 hrs or 6 mo	“250 Hour-6 Month Service ... Change engine oil and filter.” — manufacturer, manuals.deere.com
Engine oil & filter change 6068SFM50 with PLUS-50 oil and JD extended-life filter (2002 manual OMRG28997)	500 hrs or 1 yr	“the oil and filter change interval is 500 hours or every 12 months, whichever comes first.” — manufacturer, westdiesel.com
Fuel filters & water separator	500 hrs or 1 yr	“500 Hour/12 Month Service ... Replace fuel filter element.” — manufacturer, manuals.deere.com
Raw-water pump impeller current manual OMRG35856 (Tier 2 marine incl. 6068SFM75/AFM75)	2,000 hrs or 2 yrs	“2000 Hour-24 Month Service ... Inspect and repair sea water pump.” — manufacturer, manuals.deere.com
Raw-water pump impeller 2002 manual OMRG28997 (earlier PowerTech marine engines)	1,000 hrs or 2 yrs	“1000 Hour/24 Month Service ... Inspect and repair sea water pump.” — manufacturer, westdiesel.com
Engine pencil zincs	250 hrs or 6 mo	“the zinc plugs MUST BE inspected every 250 Hours.” — manufacturer, manuals.deere.com
Coolant replacement & freeze-point test coolant other than John Deere COOL-GARD	2,000 hrs or 2 yrs	“If COOL-GARD is not used, the flushing interval is 2000 hours or 24 months of operation.” — manufacturer, manuals.deere.com
Coolant replacement & freeze-point test John Deere COOL-GARD coolant	3,000 hrs or 3 yrs	“When John Deere COOL-GARD is used, the drain interval is 3000 hours or 36 months.” — manufacturer, manuals.deere.com
Valve clearance check / adjust	2,000 hrs or 2 yrs	“2000 Hour-24 Month Service ... Check and adjust engine valve clearance.” — manufacturer, manuals.deere.com
Heat exchanger & oil cooler cleaning	500 hrs or 1 yr	“500 Hour/12 Month Service ... Inspect and clean heat exchanger and aftercooler core.” — manufacturer, manuals.deere.com
Turbocharger inspection engines with sea-water aftercooler (e.g. 6068SFM50/SFM75/AFM75)	500 hrs or 1 yr	“500 Hour/12 Month Service ... Inspect and clean heat exchanger and aftercooler core.” — manufacturer, manuals.deere.com
Drive belts inspect / replace manual belt tensioner	250 hrs or 6 mo	“250 Hour-6 Month Service ... Check belt tension and wear.” — manufacturer, manuals.deere.com
Drive belts inspect / replace automatic belt tensioner	500 hrs or 1 yr	“500 Hour/12 Month Service ... Check automatic belt tensioner and belt wear.” — manufacturer, manuals.deere.com
Coolant analysis and SCAs, check cooling system, pressure test cooling system current manual OMRG35856	500 hrs or 1 yr	“500 Hour/12 Month Service ... Coolant solution analysis ... Pressure test cooling system.” — manufacturer, manuals.deere.com
Check crankshaft vibration damper (6-cyl) and test thermostats current manual OMRG35856	2,000 hrs or 2 yrs	“2000 Hour-24 Month Service ... Check crankshaft vibration damper. ... Test thermostats.” — manufacturer, manuals.deere.com
Clean crankcase vent tube / replace crankcase vent filter (if equipped)	500 hrs or 1 yr	“500 Hour/12 Month Service ... Clean crankcase vent tube.” — manufacturer, manuals.deere.com
Check engine mounts	250 hrs or 6 mo	“250 Hour-6 Month Service ... Check engine mounts.” — manufacturer, manuals.deere.com

Service part numbers (11)

Oil filter Tier 2 and later marine engines (4045TFM75, 6068AFM75, 6068AFM85)	John Deere RE504836	“OIL FILTER RE504836 (8843) (8863) (8864) (8865)” — manufacturer, deere.com
Oil filter Tier 1 marine engines (4045TFM50, 6068TFM50)	John Deere DZ118286	“OIL FILTER DZ118286 (8852, 8851, 8850, 8802)” — manufacturer, deere.com
Fuel filter final fuel filter, Tier 1 engines (4045TFM50; also listed for 6068TFM50)	John Deere RE62420	“FINAL FUEL FILTER RE62420 (35AG, 35CU, 35CV)” — manufacturer, deere.com
Fuel filter 4045TFM75 secondary element (option 35DH)	John Deere RE520842	“FUEL FILTER SECONDARY FILTER ELEMENT RE520842 (35DH)” — manufacturer, deere.com
Fuel filter 6068AFM75 / 6068AFM85 / 6068SFM75 (option codes 81AG-81BT, 35EK, 8172, 8173)	John Deere RE527961	“FUEL FILTER RE527961 (81AG) (81AH) (81AJ) (81AK) (81AQ) (81BQ) (81BR) (81BS) (81BT)” — manufacturer, deere.com · “FUEL FILTER RE527960 (35EK) RE527961 (35EK, 8172, 8173) RE525523 (35EK) RE520906 (8172, 8173)” — manufacturer, deere.ca
Fuel pre-filter / separator engine primary fuel filter element (4045TFM50, 6068TFM50; 4045TFM75 option 8154)	John Deere RE62425	“PRIMARY FUEL FILTER RE62425 (35CU) (35CV)” — manufacturer, deere.com
Fuel pre-filter / separator 4045TFM75 engine primary fuel filter element (option 8150)	John Deere RE521540	“FUEL FILTER PRIMARY FILTER ELEMENT RE521540 (8150)” — manufacturer, deere.com
Drive belt fan belt 1585-1587 mm (options 24CY / 24CZ / 24GC)	John Deere DZ119515	“DZ119515 (LGTH = 1587 mm) (24GC)” — manufacturer, deere.com · “FAN BELT DZ119515 (LGTH = 1587 mm) (24GC)” — manufacturer, deere.ca
Drive belt fan belt 1500 mm (options 240N / 24BN)	John Deere R500277	“FAN BELT R500277 (LGTH =1500 mm) (240N) (24BN)” — manufacturer, deere.com
Drive belt fan belt 1527 mm (options 24GB / 24KM)	John Deere DZ118764	“FAN BELT DZ118764 (LGTH = 1527 mm) (24GB)” — manufacturer, deere.com · “DZ118764 (LGTH = 1527 mm) (24GB)” — manufacturer, deere.ca
Crankcase vent (OCV) filter 6068AFM75 / 6068AFM85 (options 2971, 29AG)	John Deere RE502284	“CRANKCASE VENT SYSTEM RE502284 (2971) (29AG) 1500 hrs of operation” — manufacturer, deere.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.

Model sources (7)

hmy.com · sysyachtsales.com · passagemaker.com · trawlerforum.com · curtisstokes.net · defever49forsale.com · curtisstokes.net

Other DeFever models

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