Marine Trader 34 Double Cabin
Built 1972–2001 by CHB (Chung Hwa Boat Building, Taiwan)
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About the Marine Trader 34 Double Cabin
Researched from public sources for this model. Any individual boat may have been modified or repowered — confirm before relying on any figure.
- Built
- 1972–2001
- Builder
- CHB (Chung Hwa Boat Building, Taiwan)
- Designer
- Ed Monk
- Length
- 33.5 ft
- Waterline
- 30.25 ft
- Beam
- 11.75 ft
- Draft
- 3.5 ft
- Displacement
- 17,000 lb
- Hull
- fiberglass
- Hull / keel
- semi-displacement
- Propulsion
- inboard
- Fuel
- 300 gal
- Water
- 150 gal
- Holding
- 40 gal
- Bow thruster
- often added later
Tank capacities — where the figures come from
-
Fuel 300 gal
“300-gallon fuel supply” — review, trawler-beach-house.blogspot.com · “Fuel Tank: 300 Gallons” — broker listing (1990), curtisstokes.net · “Fuel Tank: 300 Gallons (1135.62 Liters)” — search excerpt (1984), yachtr.comA blog review and listings agree, though the blog may copy a powerboat guide; no builder document was found.
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Water 150 gal
“Fresh Water: 150 Gallons” — broker listing (1990), curtisstokes.net · “Fresh Water Tanks: (150 Gallons)” — search excerpt, marinesource.com · “Fresh Water: 75 Gallons (283.91 Liters)” — search excerpt (1984), yachtr.comMost listings say 150; one 1984 boat lists 75.
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Holding 40 gal
“40 gallon holding tankage” — broker listing (1990), curtisstokes.net · “Holding Tank: 40 Gallons (151.42 Liters)” — search excerpt (1984), yachtr.comListings agree.
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Water heater unknown
“Family member purchased a 77 Marine Trader 34. The water heater had been taken out.” — search excerpt (1977), trawlerforum.com · “New marine water heater. 70 gallon stainless water tank.” — search excerpt (1975), trawlerforum.comNo builder or importer equipment list found. Owner posts about two 1970s boats show a water heater was aboard (one since removed, one replaced), but not whether it was factory standard or its size.
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 often added later
“1981 Marine Trader 34 Double Cabin for sale ... has a bow thruster, generator, 3,000W inverter, A/C, dual helms” — search excerpt (1981), youtube.com · “Marine Trader CHB 34 from 1978 ... dual steering, Ford Lehman 110hp diesel, bow thruster” — search excerpt (1978), youtube.com · “Vetus bow thruster. Hydraulic steering (new hydraulic pump).” — search excerpt (1992), facebook.comThree separate boats for sale (1978, 1981, 1992) carry a bow thruster; no builder or distributor document was found, so it's not known whether any came from the factory. One 1992 boat has a Vetus unit, but one listing isn't enough to name a unit.
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Stern thruster unknown
One 1990 broker listing mentions a hydraulic stern thruster; it's a single boat, and no builder source was found.
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Steering unknown
“Twin helm stations with Hynautic H20 Hydraulic Steering Systems” — broker listing (1990), curtisstokes.net · “Hydraulic steering (new hydraulic pump).” — search excerpt (1992), facebook.comNo builder, distributor or owners' association source was found. Listings show two-helm hydraulic steering on a 1990 boat (Hynautic) and a 1992 boat, and an owners' group post mentions HyDrive hydraulic units on 1980s Marine Traders, but listings alone aren't enough to go on.
Thrusters and steering are often replaced — check the units on your boat before ordering parts.
Best-selling small imported trawler; built by CHB and also sold as La Paz, Eagle or CHB 34 DC. Importer Marine Trading International started with this Ed Monk design in the mid-1970s. Solid fiberglass construction after 1985; flybridge revised 1991. Single 120/135 hp Lehman cruises 6-8 knots at about 3 gph. Fit and finish is well below Grand Banks.
Engines fitted
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Ford Lehman 135 — 135 hp, diesel, single
standard
Standard on the great majority of boats; later boats rated 135 hp.Sources: hmy.com · trawler-beach-house.blogspot.com · curtisstokes.net
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Ford Lehman 120 — 120 hp, diesel, single
standard
Early boats carried the same six-cylinder Lehman rated 120 hp.Sources: trawler-beach-house.blogspot.com
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Cummins 6BT5.9M (210 hp) — 210 hp, diesel, single
factory option
A review lists an optional 210 hp Cummins; it is also a popular replacement for the Lehman (a 1990 boat listed with an 'upgraded' 6BT). Forum owners also mention John Deere 4045/6068, Yanmar 4JH, Volvo TAMD41A and Isuzu repowers.
Boats of the same model can differ — check which engines yours actually has before ordering parts.
Generator
“supported by a NextGen generator (1984 Marine Trader 34 Double Cabin)” — broker listing (1984), curtisstokes.net · “MASE IS 6.0S 4.8 kW generator (1990 Marine Trader 34 Double Cabin)” — broker listing (1990), curtisstokes.net
Two independent broker listings carry generators of makes and models that post-date the boats (Next Generation; Mase IS 6.0S, 4.8 kW), so both were later additions. No builder information on a factory generator option was found; the units differ, so none is listed as typical.
Known problems for this model
-
Teak decks screwed through to balsa sub-deck deck
Until 1985 the teak planking was fastened through the fiberglass into a balsa-cored sub-deck, a chronic source of leaks and wet core. Later boats have solid fiberglass decks.hmy.com
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Plywood deckhouse on early boats deck
Boats built before 1975 have a plywood cabin house covered in fiberglass cloth, prone to rot where water gets in.hmy.com
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Leaking teak window frames deck
Teak-framed windows (dropped in 1992) and poorly bedded windows generally are a common leak source on Taiwan trawlers; look for stains and rot below sills.hmy.com · pacificyachting.com
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Welded steel fuel tanks fuel
Older Taiwan trawlers commonly have welded steel tanks that leak at corners and seams as they age; replacement usually means cutting them out in pieces.pacificyachting.com
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Wet stringers hull
Holes drilled through wood-cored stringers for wiring or plumbing let bilge water in; rotted stringers let the hull flex and upset engine alignment. Have the surveyor moisture-test them.pacificyachting.com
Engines & parts
Ford Lehman 135 / SP135 (2725E) parts: good
Factory standard engine — you entered “Ford Lehman 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.
Ford Lehman 120 (6D380 / 2715E) parts: good
Factory standard 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)
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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
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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.
Cummins 6BT / 6BTA 5.9 parts: good
Factory optional engine — you entered “Cummins 6BT5.9M (210 hp)”
Mechanically injected 5.9 L inline six from the Cummins B-series truck/industrial family, so base-engine parts are everywhere. Cummins still sells factory ReCon (remanufactured) marine 6BT/6BTA engines (152–210 hp ratings) with a 2-year/2000-hour warranty. Seaboard Marine is the best-known marine specialist, selling aftercooler/heat-exchanger service kits, upgraded raw water pumps and technical guidance; TAD also sells Cummins packages.
Parts sources: Seaboard Marine, Cummins (ReCon 6BT/6BTA), Diesel Pro Power
Common problems (2)
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Aftercooler corrosion letting seawater into the intake cooling
On the turbo-aftercooled 6BTA the seawater-cooled aftercooler core has vertical tubes and an aluminum housing that corrodes from condensate; a leak can put salt water into the cylinders and wreck the engine. Owners pull, clean, grease and pressure-test the core every few years and fit new O-rings.trawlerforum.com · sbmar.com
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Heat exchanger and aftercooler service cooling
Routine seawater-side service (O-rings, gaskets, zincs) is a recurring owner job; kits are sold for it and refilling coolant without trapping air is a common question.sbmar.com · sbmar.com
Service part numbers (5)
| Oil filter | Cummins 3937743 | “| Oil Filter | 3937743 |” — dealer, marineenergy.com.au · “Cummins Oil Filter 3937743 Spin-on type, 3.66" outside diameter, 6.95" height” — dealer, dieselpro.com |
| Fuel filter 6BT 5.9 210 hp (CPL 742) |
Fleetguard FF5052 Replaces FF42000, FS1251 |
“on-engine fuel filter with drain for all 6BT 210 B’s (CPL 742). Replaces the FF42000, FS1251.” — dealer, sbmar.com · “Cummins 6BT Fuel Filter 3931063 FF5052” — dealer, marineenergy.com.au |
| Fuel filter late 6BTA (also late 4BTA and 6CTA) |
Fleetguard FF5285 | “Fleetguard FF5285 Fuel Filter – late 4BTA 6BTA and 6CTA’s” — dealer, sbmar.com · “Cummins 6BTA Fuel Filter 3890017 FF5285 ... suits late model Cummins 6BTA's, 6CTA8.3-M” — dealer, marineenergy.com.au |
| Raw-water impeller seawater pump with 1-1/4 in hose ports (Sherwood M70/M71 type, early 4BT/6BT) |
Sherwood 10615K | “Seawater Pump Impeller | **1-1/4" PORTS** 3908220 10615K” — dealer, marineenergy.com.au · “Cummins Marine Water Pump Impeller 10615K 2 9/16" diameter, 1 5/8" length” — dealer, dieselpro.com |
| Raw-water impeller keyway-shaft pump, 2 in inlet / 1-3/4 in outlet, 11° offset flange (e.g. P1716/P1730 on 6BTA) |
Sherwood 17000K | “**2" inlet & 1-3/4" outlet ports with 11° OFFSET flange** 17000K” — dealer, marineenergy.com.au · “Cummins Impeller for Key Shaft 17000K” — 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.
Model sources (6)
hmy.com · pacificyachting.com · trawler-beach-house.blogspot.com · curtisstokes.net · trawlerforum.com · curtisstokes.net
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Other Marine Trader models
- Marine Trader 34 Sedan 1973–2001
- Marine Trader 36 Double Cabin 1975–1993
- Marine Trader 38 Double Cabin 1980–2000
- Marine Trader 40 Sundeck 1983–2000
Researched from public sources. Spotted an error? The sources are listed above — tell us what they got wrong.