Island Packet 35

Built 1988–1994 by Island Packet Yachts (Largo, Florida)

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About the Island Packet 35

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 Island Packet 35 — **Illustration, not a photo of this model.** AI-generated illustration of a typical full-keel offshore cutter.

Built: 1988–1994
Builder: Island Packet Yachts (Largo, Florida)
Designer: Robert K. (Bob) Johnson
Length: 35.33 ft
Waterline: 30 ft
Beam: 12 ft
Draft: 4.5 ft
Displacement: 17,500 lb
Ballast: 8,000 lb
Hull / keel: full keel
Rig: cutter
Propulsion: inboard
Fuel: 48 gal
Water: 90 gal
Holding: 15 gal
Water heater: 6 gal · AC + engine · standard
Number built: 178
Bow thruster: often added later
Stern thruster: not fitted
Steering: rack and pinion

Tank capacities — where the figures come from

Fuel 48 gal
“48 US gal” — owners' association (1988-1993), iphomeport.com · “48 (gals)” — owners' association (1988-1993), iphomeport.com

The Island Packet owners' site (IP Home Port) spec page and its all-model comparison table agree; the site calls its figures representative, as Island Packet specs changed during production.
Water 90 gal
“90 US gal” — owners' association (1988-1993), iphomeport.com · “90 (gals)” — owners' association (1988-1993), iphomeport.com
Holding 15 gal
“15 US gal” — owners' association (1988-1993), iphomeport.com · “15 (gals)” — owners' association (1988-1993), iphomeport.com
Water heater 6 gal · AC + engine · standard
“allow the six gallon water heater to completely fill ... operate on either shore power (115 volt A-C) or by the heat exc” — owner's manual, ipyoa.com

The builder's Island Packet 35 owner's manual, hosted by the owners' association, shows the 6 gal heater in the fresh-water system and a water-heater breaker on the AC panel, while marking items like cockpit cushions and centerboard optional, so we list it as standard. It sits aft, reached from the quarter berth and port cockpit locker.

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 often added later
The builder's Island Packet 35 owner's manual doesn't mention a thruster. The Island Packet owners' association has a 2004 photo album of one owner's bow thruster installation on a 35, a single boat and not enough to say they're often added later.
Stern thruster not fitted
Nothing was found either way; our earlier figure of none appears to be an assumption.
Steering rack and pinion
“The rack and pinion steering gear provides a direct drive wheel steering system unmatched for its feel and reliability.” — owner's manual, ipyoa.com · “Direct Steering System: Island Packet's geared rack and pinion steering system provides positive feel and superior relia” — brochure (c1994-1995), cdn.yachtbroker.org

The builder's owner's manual describes a wheel on a rack-and-pinion gear, with the quadrant clamped to the rudder shaft and the upper bearing inside the steering seat base. The manual names no steering maker.

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

Hull length (LOD) 35.33 ft; 38 ft overall including bowsprit (sailboatdata lists both). Keel/centerboard version: 3.7 ft board up / 7.2 ft down.

Engines fitted

Yanmar 3HM35F — 35 hp, diesel, single standard
Early boats: sailboatdata gives Yanmar 35/38 hp; a 1989 IP35 listing names the 3HM35F at 35 hp.

Sources: sailboatdata.com · instagram.com
Yanmar 3JH2E — 38 hp, diesel, single standard
Later boats: a 1993 IP35 lists a 38 hp 3JH2E, and the Island Packet owners' association documents removing a 3JH2E from an IP35.

Sources: sailboatdata.com · mls.ybaa.org · ipyoa.com
Yanmar 3YM30 — diesel, single common repower
An owner of a 1990 IP35 reports a Yanmar 3YM30, a much later Yanmar model, so a replacement engine; one report only.

Sources: cruisersforum.com

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

Generator

The builder's owner's manual describes 12 V DC and 115 V shore-power systems only and does not mention a generator; no review names one.

Manuals and brochures online

Owner's manual Island Packet 35 Owner's Manual (builder manual, scan, 50 pp) — ipyoa.com

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

Known problems for this model

Encapsulated stainless chainplates (crevice/stress corrosion) rigging
Chainplates are glassed into the hull/caprail area where corrosion cannot be seen; boats before the 1996 model year used 304 stainless, which the former factory staffer running IP Ancestry says lasts roughly 20-25 years. A specialist yard reported most IP chainplates it replaced were failed or near failure, so plan on inspection or replacement (all hulls are pre-1996 304 stainless).
island-packet-ancestry.com · forums.ybw.com
Aluminum holding (and some fuel) tanks corrode plumbing
Owners report aluminum holding tanks installed under the cabin sole corroding and needing to be cut out for replacement; later boats moved to fiberglass tanks.
forums.ybw.com
Full keel with prop in aperture - poor control astern hull
Owners and reviewers note the full-keel boats back up unpredictably; many owners add a bow thruster.
practical-sailor.com · forums.ybw.com

Engines & parts

Yanmar 3YM30 / 3YM20 parts: good

Factory common repower engine — you entered “Yanmar 3YM30”

Current-generation Yanmar with full dealer support; raw water pump impellers are Jabsco-compatible.

Parts sources: Mack Boring & Parts (Yanmar distributor), Yanmar USA genuine parts

Common problems (3)

Leaking heat exchangers and overheating cooling
Owners report heat exchangers leaking (pressed-in tube joint) and overheating; trapped air in the freshwater circuit and failed impellers are other common causes.
forums.ybw.com · forums.sailboatowners.com
Seawater pump leaks cooling
The Johnson seawater pump is a frequent leak source, and leaks near the elbow hose can corrode the starter and heat exchanger studs.
forums.ybw.com
Restrictive cast iron elbow exhaust
The cast iron exhaust riser/elbow clogs with soot, raising back pressure.
forums.ybw.com

Maker’s service schedule (18)

Engine oil & filter change	150 hrs or 1 yr	“4.3.4 Inspection Every 150 Hrs (or one year). (1) Replace the Engine Oil” — manufacturer, j30.us
Replace engine oil filter	250 hrs or 1 yr	“4.3.5 Inspection Every 250 Hrs (or one year).” — manufacturer, j30.us
Transmission fluid change KM marine gear (shaft drive)	150 hrs or 1 yr	“4.3.4 Inspection Every 150 Hrs (or one year). ... (2) Replace the Marine Gear oil” — manufacturer, j30.us
Transmission fluid change SD sail-drive installations	100 hrs or 6 mo	“4.3.3 Inspection Every 100 Hrs (or six months). (1) Replace the Sail Drive Oil” — manufacturer, j30.us
Fuel filters & water separator	250 hrs or 1 yr	“4.3.5 Inspection Every 250 Hrs (or one year). (1) Replace the Fuel Tank Refer to 4.3.1(4). (2) Replace the Fuel Filter” — manufacturer, j30.us
Drain fuel/water separator	50 hrs or 1 mo	“4.3.2 Inspection Every 50 Hrs. (or Monthly) (1) Drain the fuel/water separator.” — manufacturer, j30.us
Drain fuel tank (water/sediment)	250 hrs or 1 yr	“4.3.5 Inspection Every 250 Hrs (or one year). (1) Replace the Fuel Tank Refer to 4.3.1(4).” — manufacturer, j30.us
Raw-water pump impeller	1,000 hrs or 4 yrs	“The impeller must be replaced with new one periodically (every 1000 hrs or 4 years whichever comes first).” — manufacturer, j30.us
Coolant replacement & freeze-point test	1 yr	“Replace the fresh water coolant Every year When long life coolant is used of a specified type (see page 24), a replaceme” — manufacturer, j30.us
Air filter / intake silencer	250 hrs or 1 yr	“4.3.5 Inspection Every 250 Hrs (or one year).” — manufacturer, j30.us
Exhaust mixing elbow inspection	250 hrs or 1 yr	“4.3.5 Inspection Every 250 Hrs (or one year).” — manufacturer, j30.us
Drive belts inspect / replace	250 hrs or 1 yr	“Replace the alternator driving belt with new one every 1000 hours or four years, whichever comes first, even if there is” — manufacturer, j30.us
Valve clearance check / adjust	1,000 hrs or 4 yrs	“4.3.6 Inspection Every 1000 Hrs (or 4 years). (1) Inspection and Adjustment of Intake/ Exhaust Valve Clearance.” — manufacturer, j30.us
Injector test / service	1,000 hrs or 4 yrs	“4.3.6 Inspection Every 1000 Hrs (or 4 years). ... (2) Inspect and Adjust the Fuel Injection Spray Condition.” — manufacturer, j30.us
Inspect/adjust fuel injection timing (dealer)	1,000 hrs or 4 yrs	“4.3.6 Inspection Every 1000 Hrs (or 4 years). ... (4) Inspect and Adjust the Fuel Injection Timing” — manufacturer, j30.us
Replace flexible engine mounts	1,000 hrs or 4 yrs	“Be sure to replace the Yanmar flexible engine mounts every 1000 hours or 4 years, whichever comes first.” — manufacturer, j30.us
Breather diaphragm assembly inspection (dealer)	1,000 hrs or 4 yrs	“4.3.6 Inspection Every 1000 Hrs (or 4 years). ... (5) Diaphragm assembly inspection” — manufacturer, j30.us
Check wiring connectors	250 hrs or 1 yr	“4.3.5 Inspection Every 250 Hrs (or one year).” — manufacturer, j30.us

Service part numbers (9)

Oil filter	Yanmar 119305-35170 Replaces 119305-35151, 119660-35150	“3YM30 Basic Service Kit up to serial #E01732 ... 119305-35170 FILTER ASSY, D68XL65 (Oil)” — dealer, oldportmarine.com · “It fits Yanmar 1GM10, 2GM20F, 2YM15, 3GM, 3GM30F, 3JH2E, 3YM30, 4JH3E engines. Cross Reference: 119305-35151 119660-3515” — dealer, deltadieselparts.com
Fuel filter	Yanmar 104500-55710	“Fuel Filter Element 1 104500-55710 / Fuel Filter O-Ring 1 24341-000440” — dealer, ellebogen.com · “3YM30 Basic Service Kit up to serial #E01732 ... 104500-55710 ELEMENT, FUEL FILTER” — dealer, oldportmarine.com
Raw-water impeller	Yanmar 128990-42570 Replaces 128990-42200	“3YM30 Basic Service Kit up to serial #E01732 ... 128990-42570 IMPELLER KIT” — dealer, oldportmarine.com · “(Supersedes part number: 128990-42200) ... 2YM15 3YM20 3YM27A, 3YM30R 3YM30” — dealer, palmerpower.com
Drive belt early 3YM30 / 3YM20, below the serial break	Yanmar 128990-77350	“128990-77350 3YM30 up to serial #E01732 Belt” — dealer, oldportmarine.com · “S/W Pump Belt 1 128990-77350 < E00304” — dealer, ellebogen.com
Drive belt later 3YM30 / 3YM20, from the serial break	Yanmar 104511-78780	“104511-78780 3YM30 starting serial #E01733 Belt” — dealer, oldportmarine.com · “S/W Pump Belt 1 104511-78780 E00305 >” — dealer, ellebogen.com
Drive belt June 2004 up to serial E20847	Yanmar 129612-42290	“Alternator V-Belt 1 129612-42290 June 2004 > / < E20847” — dealer, ellebogen.com · “3YM30 Basic Service Kit up to serial #E01732 ... 129612-42290 V-BELT, A37.5 (Alternator)” — dealer, oldportmarine.com
Drive belt from serial E20848 (120 A alternator)	Yanmar 128990-77580	“Alternator Flat Belt 1 128990-77580 E20848 >” — dealer, ellebogen.com · “3YM30 Basic Service Kit starting serial #E20848 ... Serpentine belt 128990-77580” — dealer, oldportmarine.com
Air filter	Yanmar 128270-12540	“Air Filter Element 1 128270-12540” — dealer, ellebogen.com · “128270-12540 Air Element” — dealer, oldportmarine.com
Thermostat	Yanmar 128990-49800	“Thermostat 1 128990-49800 / Thermostat Gasket N/A Not Fitted” — dealer, ellebogen.com · “128990-49800 Thermostat” — dealer, oldportmarine.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 (11)

sailboatdata.com · island-packet-ancestry.com · forums.ybw.com · instagram.com · mls.ybaa.org · ipyoa.com · cruisersforum.com · iphomeport.com · iphomeport.com · ipyoa.com · cdn.yachtbroker.org

Other Island Packet models

Island Packet 27 1984–1992
Island Packet 31 1983–1989
Island Packet 32 1990–1996
Island Packet 350 1997–2004
Island Packet 38 1986–1993
Island Packet 40 1994–2000

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