CHB 34 Double Cabin
Built 1972–1985 by CHB (Chung Hwa Boat Building, Taiwan)
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About the CHB 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
- 1972–1985
- 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
No builder document from CHB or Marine Trader was found. A 1976 boat's listing gives 300 gal, matching the HMY powerboat guide.
-
Water 150 gal
The same 1976 listing gives 150 gal, matching. There's no builder source.
-
Holding 40 gal
The 1976 listing may mention a 50 gal holding tank on that boat, but its text is cut off. Owners in a CHB group discuss fitting larger replacement tanks under the V-berth. No factory figure was found.
-
Water heater unknown
No CHB equipment list, review or readable listing with heater details found. CHB also built the Marine Trader 34 Double Cabin, but that model's owner reports were not carried over.
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
“Maneuvering in close quarters is made exceptionally easy thanks to both bow and stern thrusters—a rare and valuable feat” — broker listing (1976), globalyachtexchange.com · “Marine Trader CHB 34 from 1978 ... dual steering, Ford Lehman 110hp diesel, bow thruster” — search excerpt (1978), youtube.comTwo separate boats for sale (1976 US, 1978 UK) have bow thrusters; the 1976 boat's broker calls thrusters rare for that vintage, and no builder document lists one. The same hull was sold as the Marine Trader 34 Double Cabin, where more listed boats show thrusters.
-
Stern thruster unknown
One 1976 boat also has a stern thruster; it's a single boat, and no builder source was found.
-
Steering unknown
No builder or model-specific owners' source was found. An owner-written CHB buyers' guide covers both hydraulic and mechanical chain steering on 1973-85 CHB models without saying which the 34 Double Cabin had; listings mention dual helms only.
Thrusters and steering are often replaced — check the units on your boat before ordering parts.
Same boat as the Marine Trader 34 Double Cabin (imported by Marine Trader; also sold as La Paz and Eagle). Over 1,600 built per the BoatUS notes. After 1985 the deck and deckhouse became one-piece fiberglass; flybridge revised 1991; teak window frames dropped 1992. Single 120/135 hp Lehman cruises 6-7 knots at 2-3 gph. The Ed Monk design credit comes from Pacific Yachting's history of the Marine Trader 34. Over 1,600 built (BoatUS notes on HMY).
Engines fitted
-
Ford Lehman 120 — 120 hp, diesel, single
standard
HMY: a single 120 hp Lehman cruises at 6-7 kn on 2-3 gph. A 1981 CHB 34 Tri-Cabin listing shows a single 120 hp Ford Lehman dated 1981.Sources: hmy.com · everett.boatshed.com
-
Ford Lehman 135 — 135 hp, diesel, single
factory option
HMY's BoatUS note says a single 120 or 135 hp diesel; which rating was base in which years is not stated.Sources: hmy.com
-
Ford Lehman 80 — 80 hp, diesel, twin
factory option
A 1977 CHB 34 double/tri-cabin with twin 80 hp Lehmans; the poster says it was the only twin-engine 34 he had seen, so twins were uncommon.Sources: trawlerforum.com
-
Perkins Sabre M135 (6-cyl) — 135 hp, diesel, single
common repower
A 1984 CHB 34 Double Cabin was repowered in 2003 with a Perkins Sabre 135 six. One documented case.Sources: pacificmarine.org
Boats of the same model can differ — check which engines yours actually has before ordering parts.
Generator
No builder information found; the one listing read gave no generator details.
Known problems for this model
-
Teak decks fastened into balsa sub-deck deck
Until 1985 teak planks were screwed through the fiberglass into a balsa-cored sub-deck, a constant source of leaks and wet core.hmy.com
-
Plywood deckhouse before 1975 deck
Pre-1975 boats have a glass-sheathed plywood cabin house that rots where water gets past the sheathing.hmy.com
-
Welded steel tanks fuel
Taiwan trawlers of this period often have welded steel tanks that leak at corners and seams; plan on inspection and possible cut-out replacement.pacificyachting.com
-
Wet or rotten stringers hull
Wood-cored stringers that have been drilled for wiring or plumbing can soak up bilge water and rot; have them moisture-tested.pacificyachting.com
Engines & parts
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)
-
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 optional 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 80 (4D254 / 2712E) parts: good
Factory optional engine — you entered “Ford Lehman 80”
Four-cylinder sibling of the Lehman 120, marinized from the Ford Dorset 2712E (base engine built 1964–1984). American Diesel publishes a Lehman 4D254-80 (2712E) spare-parts list; lift pumps, filters and many service parts are shared with the 120 (2715E).
Parts sources: American Diesel Corp, Fred Warner Marine & Outdoors, Go2marine (Ford Lehman parts collection)
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)
| Oil filter | Baldwin B2 | “Lehman - models w/Ford 242 & 254, 363, & 380” — dealer, go2marine.com · “Oil Filter suits Ford Lehman 2712E. Baldwin Filter B2. (Z9)” — dealer, marineenergy.com.au |
| Raw-water impeller | Jabsco 1210-0001 | “2712 E 10950-205 040 3/4" BSP Flange • 10950-2401 SK239 3298 1210-0001” — manufacturer, marineengine.com · “Breakdown of 2C48 Pump ... 9 1 1210-0001 IMPELLER” — manufacturer, marinesurveyorontario.com |
| Raw-water pump kit Jabsco 10950-205 / 10950-2401 pump, or the Lehman 2C48 replacement pump |
Jabsco SK239 | “2712 E 10950-205 040 3/4" BSP Flange • 10950-2401 SK239 3298 1210-0001” — manufacturer, marineengine.com · “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 (6)
hmy.com · pacificyachting.com · everett.boatshed.com · trawlerforum.com · pacificmarine.org · globalyachtexchange.com
Other CHB models
- CHB 38 Double Cabin 1978–1985
- CHB 42 Europa
Researched from public sources. Spotted an error? The sources are listed above — tell us what they got wrong.