Marine Trader 40 Sundeck
Built 1983–2000
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About the Marine Trader 40 Sundeck
Researched from public sources for this model. Any individual boat may have been modified or repowered — confirm before relying on any figure.
- Built
- 1983–2000
- Length
- 39.33 ft
- Waterline
- 36.42 ft
- Beam
- 12.92 ft
- Draft
- 4 ft
- Displacement
- 25,000 lb
- Hull
- fiberglass
- Hull / keel
- semi-displacement
- Propulsion
- inboard
- Fuel
- 350 gal
- Water
- 250 gal
- Holding
- 50 gal
- Generator
- fitted on some boats
Tank capacities — where the figures come from
-
Fuel 350 gal
“Fuel Tank: 350 Gallons (1324.89 Liters)” — broker listing (1986), curtisstokes.netOne listing agrees; no builder figure.
-
Water 250 gal
“Fresh Water: 250 Gallons (946.35 Liters)” — broker listing (1986), curtisstokes.netOne listing agrees.
-
Holding 50 gal
“Holding Tank: 40 Gallons (151.42 Liters)” — broker listing (1986), curtisstokes.netOne listing says 40.
-
Water heater unknown
“Force 10 11 gallon stainless steel water heater” — broker listing (1986), curtisstokes.net · “Bosch Water Heater (2.7gallon)” — broker listing (1985), yachtr.comTwo listings show different heaters (Force 10 11 gal; a small Bosch 2.7 gal unit), both evidently replacements; no builder figure found.
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
No builder, review or listing source was found.
-
Stern thruster unknown
Nothing found.
-
Steering unknown
“I have a Taiwan Sundeck with hydraulic steering and to access the top of my rudders on the Port side I can pull a lower” — search excerpt, trawlerforum.comNo first-hand source was found. A forum post from an owner of an unnamed Taiwan-built sundeck mentions hydraulic steering to twin rudders, but the model isn't stated.
Thrusters and steering are often replaced — check the units on your boat before ordering parts.
Aft-cabin sundeck cruiser with galley-down two-stateroom layout and very large full-width sundeck. A single Lehman was standard; many have twin 135 hp Lehmans (7-8 knots). The Marine Trader 44 Yachtfish is the same boat with a cockpit.
Engines fitted
-
Ford Lehman SP135 (2725E) — 135 hp, diesel, single
standard
HMY says a single Lehman was standard; a 1986 Sundeck lists a single Ford Lehman 2725E SP135.Sources: hmy.com · curtisstokes.net
-
Ford Lehman 135 — 135 hp, diesel, twin
factory option
HMY: twin 135 hp Lehmans cruise the boat economically at 7-8 kn.Sources: hmy.com
-
Ford Lehman 120 — 120 hp, diesel, single or twin
factory option
Cruisers Forum owners report Marine Trader 40s with a single FL120 and with twin 120s; the thread does not say whether these are Sundecks or the older 40 Double Cabin.Sources: cruisersforum.com
Boats of the same model can differ — check which engines yours actually has before ordering parts.
Generator
“Westerbeke BT8.0-614 generator” — broker listing (1986), curtisstokes.net · “Westerbeke WMD 8kw Diesel Generator” — broker listing (1985), yachtr.com
No builder or importer equipment list was found. Two mid-1980s boats carry Westerbeke 8 kW diesels, and other online mentions give an 8.5 kW set and an 8 kW Kohler on Marine Trader sundecks of unstated length or year.
-
Westerbeke 8 kW (BT8.0 / WMD 8) — 8 kW, diesel
Seen on two independent boats (1985 LaBelle 40 Sundeck, 1986 40 Sundeck); whether factory-installed or added is not stated.“Westerbeke BT8.0-614 generator” — broker listing (1986), curtisstokes.net · “Westerbeke WMD 8kw Diesel Generator” — broker listing (1985), yachtr.com
Generators are often replaced or added — check the unit's own plate before ordering parts.
Known problems for this model
-
Window and deck leaks typical of Taiwan trawlers deck
Check for staining below window sills and soft spots in the decks and sundeck; water intrusion into cored decks and superstructure is the most common big-ticket repair on this class of boat.pacificyachting.com
Engines & parts
Ford Lehman 135 / SP135 (2725E) parts: good
Factory standard engine — you entered “Ford Lehman SP135 (2725E)”
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.
Ford Lehman 120 (6D380 / 2715E) parts: good
Factory optional engine — you entered “Ford Lehman 120”
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.
Model sources (5)
hmy.com · pacificyachting.com · curtisstokes.net · cruisersforum.com · yachtr.com
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Other Marine Trader models
- Marine Trader 34 Double Cabin 1972–2001
- Marine Trader 34 Sedan 1973–2001
- Marine Trader 36 Double Cabin 1975–1993
- Marine Trader 38 Double Cabin 1980–2000
Researched from public sources. Spotted an error? The sources are listed above — tell us what they got wrong.