Pearson 365
Built 1976–1982 by Pearson Yachts
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About the Pearson 365
Researched from public sources for this model. Any individual boat may have been modified or repowered — confirm before relying on any figure.
- Built
- 1976–1982
- Builder
- Pearson Yachts
- Designer
- William Shaw
- Length
- 36.42 ft
- Waterline
- 30 ft
- Beam
- 11.42 ft
- Draft
- 4.5 ft
- Displacement
- 17,700 lb
- Ballast
- 7,300 lb
- Hull
- fiberglass
- Hull / keel
- fin keel
- Rig
- ketch
- Propulsion
- inboard
- Fuel
- 46 gal
- Water
- 150 gal
- Water heater
- engine + AC · standard
- Number built
- 405
- Stern thruster
- not fitted
- Steering
- pedestal cable · Edson
Tank capacities — where the figures come from
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Fuel 46 gal
“46 Gallons (U.S.) FUEL CAPACITY” — owner's manual (Westerbeke W-40 boats), pearsonyachts.org · “50-gallon steel fuel tank” — review, sailingmagazine.net · “Fuel 50” — spec database, dan.pfeiffer.netThe builder's owner's guide says about 46 US gal; a magazine and spec tables round it to 50. Some owners have replaced the rusting steel tank with two smaller stainless tanks.
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Water 150 gal
“THREE (3) SEPARATE WATER TANKS WITH A TOTAL CAPACITY OF APPROXIMATELY 150 GALLONS” — owner's manual, pearsonyachts.org · “The freshwater tank holds 150 gallons” — review, sailingmagazine.netPort and starboard under the main-cabin berths plus one under the V-berth.
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Holding unknown
Owner's guide describes the head with intake and discharge seacocks only; no holding tank listed.
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Water heater engine + AC · standard
“Hot and cold pressure water is supplied to the galley sink, wash basin, and shower (Section XI, Fresh Water System)” — owner's manual, pearsonyachts.org · “Hot water heater ... By running the main engine, part of its cooling water passes through a coil ... If the boat is wire” — owner's manual, pearsonyachts.orgPearson's P-365 owner's guide treats hot and cold pressure water as part of the fresh-water system, not optional equipment, with the heater at the forward end of the starboard sail locker. The engine coil always heats it; the electric element works only with the optional 110 V shore-power wiring, drawn with and without a water-heater circuit.
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
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Bow thruster unknown
Pearson's factory commissioning checklist in the Owner's Guide (standard gear plus a long option list including autopilot, refrigeration and electronics) and the 1977 parts catalog list no thruster. One checklist page is missing from the scanned copy, so we don't say none was fitted.
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Stern thruster not fitted
Our earlier figure of none had no direct source. The builder's checklist and parts catalog show no thruster, though one checklist page is missing from the scanned copy.
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Steering pedestal cable · Edson
“Edson steerer ... 6" deck plate for emergency tiller ... Pedestal guard ... Throttle on pedestal” — owner's manual, pearsonyachts.org · “PEDESTAL GUARD, Edson steerer ... EDSON WHEEL BRAKE ... EMERGENCY TILLER HANDLE” — owner's manual (1977), pearsonyachts.org · “PEARSON 365 ... CLASSIC PEDESTAL STEERER ... CHAIN & WIRE ROPE KIT ... ADJUSTABLE CROSSED WIRE IDLER ... RADIAL DRIVE WH” — spec database, edsonmarine.comPearson's commissioning checklist and 1977 parts catalog (in the Owner's Guide) give an Edson pedestal steerer with emergency tiller as standard. The chain-and-wire-to-radial-drive mechanism comes from Edson's data sheet S-759 for the Pearson 365.
Thrusters and steering are often replaced — check the units on your boat before ordering parts.
Sources disagree on engines, hp of the original Westerbeke — left blank rather than guessed.
Most were ketches; sloop, cutter and pilothouse versions also built. Solid hull with a liner, balsa-cored deck, 7,300 lb lead ballast. Original diesel make is disputed (see disputed). Shoal draft 4.5 ft.
Engines fitted
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Westerbeke W-40 (4-108) — 42 hp, diesel, single
standard
Original engine: a Perkins-based Westerbeke 40 driving a Walter V-drive. Sailing Magazine gives 42 hp. Beta Marine lists the original power as "Westerbeke W-40 & Perkins 4.108". A 1977 boat for sale describes its "original Westerbeke 4-108", and a 1981 boat also has a 4-108 (search excerpt).
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Yanmar — diesel, single
common repower
Sailing Magazine and listingsport say some owners replaced the Westerbeke with a Yanmar. No model is named.Sources: sailingmagazine.net · listingsport.com
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Beta Marine Beta 35 — diesel, single
common repower
Beta Marine USA calls the 365 one of the boats it most often repowers. It prefers the Beta 35 because its 2800 rpm maximum suits the original 2:1 Walter V-drive. This is the maker's own page, and it does not state hp.Sources: betamarineusa.com
Boats of the same model can differ — check which engines yours actually has before ordering parts.
Generator
The owner's guide's two optional-equipment sections list stove, instruments, refrigeration, propane and a shore-power converter, but no generator.
Manuals and brochures online
- Owner's manual Pearson 365 Owner's Guide and Protection Plan — pearsonyachts.org
Hosted by the builder or an owners' association; they own the copyright.
Known problems for this model
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Rusting steel fuel tank fuel
The 50-gallon steel fuel tank is known to rust through; replacement usually means pulling the engine out through the companionway.sailingmagazine.net
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Corroded mast step and mast foot rigging
The steel plate under the keel-stepped main mast sits in standing water and corrodes, which also eats the bottom of the aluminum mast.sailingmagazine.net
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Screwed-in hatches and ports leak; cored deck deck
Ports and hatches were fastened with screws and tend to leak or go soft, and the balsa-cored deck can delaminate where water gets in.sailingmagazine.net
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Screw-fastened hull-deck joint deck
The hull-deck joint uses screws rather than through-bolts (glassed over inside), which has raised concern among owners.sailingmagazine.net
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Awkward engine access engine
Maintenance is hampered by cramped access to the engine compartment.sailingmagazine.net
1 more
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Small cockpit drains plumbing
The large cockpit has two small drains and is slow to empty; some owners add or enlarge drains.sailingmagazine.net
Engines & parts
Westerbeke W-40 (Westerbeke 40) parts: good
Factory standard engine — you entered “Westerbeke W-40 (4-108)”
Shares its base engine and rear-seal problem with the Perkins 4.108 (Foley Engines' 4.108 rear seal fix also covers the Westerbeke 40), so many internal parts can be sourced through Perkins 4.108 channels such as TAD and Foley.
Parts sources: Foley Engines, Trans Atlantic Diesels (Perkins 4.108 parts), Westerbeke (factory parts store)
Common problems (2)
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Rear main seal leak engine
Same chronic rope-seal leak as the Perkins 4.108.foleyengines.com
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Overheating under load cooling
Owners chasing W-40 overheating often find a nearly blocked raw water elbow at the exhaust elbow or a failed heat exchanger.cruisersforum.com
Maker’s service schedule (19)
| Engine oil & filter change W 40NA (1988 operator's manual, pub. 37169) | 100 hrs | “Servicing After Every 100 Hours of Operation 1. Change the engine's lubrication oil and oil filter.” — manufacturer (1988), westerbeke.com |
| Engine oil & filter change Westerbeke 40 / Four-107 (1980 technical manual, pub. 20502 ed. 8) | 150 hrs or 1 yr | “IT IS MANDATORY THAT THE CHECKS 3, 4, 5 AND 6 BE ATTENDED TO WHEN TOTAL OPERATING TIME REACHES 150 HOURS.” — manufacturer (1980), westerbeke.com |
| Fuel filters & water separator Westerbeke 40 / Four-107 (1980 technical manual, pub. 20502 ed. 8) | 1 yr | “10. Wash primary filter bowl and screen. ... 11. Replace secondary fuel filter element.” — manufacturer (1980), westerbeke.com |
| Valve clearance check / adjust W 40NA (1988 operator's manual, pub. 37169) | 500 hrs | “Servicing After Every 500 Hours of Operation *1. Torque the cylinder head nuts. *2. Adjust the valve clearances.” — manufacturer (1988), westerbeke.com |
| Retorque cylinder head nuts W 40NA (1988 operator's manual, pub. 37169) | 500 hrs | “Servicing After Every 500 Hours of Operation *1. Torque the cylinder head nuts.” — manufacturer (1988), westerbeke.com |
| Drive belts inspect / replace W 40NA (1988 operator's manual, pub. 37169) | 100 hrs | “Servicing After Every 100 Hours of Operation ... 2. Adjust the alternator and water pump drive belt tension, if required” — manufacturer (1988), westerbeke.com |
| Drive belts inspect / replace Westerbeke 40 / Four-107 (1980 technical manual, pub. 20502 ed. 8) | 1 yr | “SEASONAL CHECK-OUT (MORE OFTEN IF POSSIBLE) ... 1. Check generator or alternator "V" belt for tension.” — manufacturer (1980), westerbeke.com |
| Raw-water pump impeller W 40NA (1988 operator's manual, pub. 37169) | 250 hrs | “Servicing After Every 250 Hours of Operation ... Check the sea water pump's Impeller.” — manufacturer (1988), westerbeke.com |
| Coolant replacement & freeze-point test W 40NA (1988 operator's manual, pub. 37169) | 500 hrs | “Servicing After Every 500 Hours of Operation ... 3. Drain, flush, and refill the fresh water cooling system.” — manufacturer (1988), westerbeke.com |
| Coolant replacement & freeze-point test Westerbeke 40 / Four-107 (1980 technical manual, pub. 20502 ed. 8) | 1 yr | “END OF SEASON SERVICE 1. Drain fresh water cooling system ... 3. Fill fresh water cooling system with antifreeze” — manufacturer (1980), westerbeke.com |
| Engine pencil zincs W 40NA (1988 operator's manual, pub. 37169) | 1 mo | “Monthly Check the condition of the zinc anode in the heat exchanger's sea water circuit.” — manufacturer (1988), westerbeke.com |
| Engine pencil zincs Westerbeke 40 / Four-107 (1980 technical manual, pub. 20502 ed. 8) | 1 yr | “2. Remove zinc rod (usually located in heat exchanger) and see if it needs replacing.” — manufacturer (1980), westerbeke.com |
| Air filter / intake silencer Westerbeke 40 / Four-107 (1980 technical manual, pub. 20502 ed. 8) | 1 yr | “12. Replace air filter.” — manufacturer (1980), westerbeke.com |
| Injector test / service W 40NA (1988 operator's manual, pub. 37169) | 800 hrs | “Servicing Attar Every 800 Hours of Operation *1. Remove and check fuel injectors.” — manufacturer (1988), westerbeke.com |
| Compression test, alternator check, tighten bolts/nuts/clamps W 40NA (1988 operator's manual, pub. 37169) | 800 hrs | “Servicing Attar Every 800 Hours of Operation ... *2. Check the engine's compression pressure.” — manufacturer (1988), westerbeke.com |
| Heat exchanger & oil cooler cleaning W 40NA (1988 operator's manual, pub. 37169) | 1,000 hrs | “Servicing After Every 1000 Hours of Operation 1. Remove, clean, and pressure test the primary heat exchanger.” — manufacturer (1988), westerbeke.com |
| Check fuel injection pump timing W 40NA (1988 operator's manual, pub. 37169) | 1,000 hrs | “Servicing After Every 1000 Hours of Operation ... *2. Check the fuel injection pump's timing.” — manufacturer (1988), westerbeke.com |
| Transmission fluid change W 40NA with Hurth HBW 150 gearbox (1988 operator's manual) | 250 hrs or 1 yr | “Change the transmission fluid after the first 30 hours of engine operation and thereafter every 250 hours (or once per y” — manufacturer (1988), westerbeke.com |
| Transmission fluid change Westerbeke 40 with Westerbeke-Paragon SA1/SAO manual or Paragon P200/P300/P400 hydraulic gear (1980 technical manual) | 100 hrs or 1 yr | “Under normal conditions, the oil should be changed every 100 hours or each season, whichever is shorter.” — manufacturer (1980), westerbeke.com |
Service part numbers (11)
| Oil filter Spin-on filter (engines from 1975; also the pre-1975 spin-on conversion) |
Westerbeke 016655 | “40 16655 FILTER LUBE OIL” — manufacturer, westerbeke.com |
| Oil filter Early canister-type oil filter (to 1975), element only |
Westerbeke 011268 | “35 11268 ELEMENT LUBE OIL FILTER” — manufacturer, westerbeke.com |
| Fuel filter | Westerbeke 011703 | “11703 ELEMENT,FUEL” — manufacturer, hansenmarine.com |
| Fuel pre-filter / separator | Westerbeke 032974 | “92-2 32974 FILTER SEDIMENTER/WATER TRAP” — manufacturer, westerbeke.com |
| Raw-water impeller Sea water pump 16423 (rubber impeller; standard) |
Westerbeke 033104 | “9 33104 KIT IMPELLER AND GASKET” — manufacturer, westerbeke.com · “33104 IMPELLER KIT 16423 PUMP” — manufacturer, hansenmarine.com |
| Raw-water impeller Old sea water pump 11020 (NLA, replaced by pump 16423) |
Westerbeke 011906 | “5 11906 KIT IMPELLER AND GASKET” — manufacturer, westerbeke.com |
| Raw-water pump kit Sea water pump 16423 |
Westerbeke 018172 | “2-3 18172 KIT MAJOR REPAIR” — manufacturer, westerbeke.com · “18172 KIT,WATER PUMP 16423 MAJOR REP” — manufacturer, hansenmarine.com |
| Drive belt Standard alternator |
Westerbeke 012270 | “12270 BELT” — manufacturer, hansenmarine.com |
| Air filter | Westerbeke 012556 | “2 12556 FILTER AIR INTAKE” — manufacturer, westerbeke.com |
| Zinc / anode | Westerbeke 011885 | “23 11885 ZINC” — manufacturer, westerbeke.com |
| Thermostat | Westerbeke 024688 | “9 24688 THERMOSTAT” — 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.
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)
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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
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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
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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)
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Other Pearson models
- Pearson 26 1970–1983
- Pearson 30 1971–1981
- Pearson 323 1976–1983
- Pearson 34 1983–1986
- Pearson 35 1968–1982
Researched from public sources. Spotted an error? The sources are listed above — tell us what they got wrong.