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3JH2 Marine

Yanmar 3JH2 · 3JH family: specifications, its industrial/tractor base engine, cross-referenced parts and where to buy them.

🚜 Base engine confirmed

The Yanmar 3JH2 is a Yanmar marine diesel in the 3JH2 family. Yanmar designs and sells both marine and industrial diesels; internal service parts for this family are listed in the 3JH2 parts book and often sell cheaper through industrial/agricultural channels than under marine dealer pricing. — Yanmar OEM parts catalog in-repo (brands/yanmar/data/extracted/catalogs.csv)

38 hp27.9 kW
1363 ccdisplacement
82×86 mmbore × stroke
3-cylcylinders
165 kgengine dry
1991–1998year range (approx)
NAaspiration

NA base; max 38mhp/cont 35mhp@3400 (LSM-Diesel)

📋 Full specifications 7 🚜 Industrial / tractor base 🔧 Aftermarket 70
Cheaper-part coverage · 6/8
🚜 Base engine ✓🌀 Impeller ✓💧 Raw-water pump🛢️ Oil filter ✓⛽ Fuel filter ✓🌡️ Thermostat ✓➰ Belt ✓⚓ Anode

A ✓ means at least one cheaper channel — aftermarket, the tractor/industrial base engine, or a standard component — exists for this engine in that category.

Parts by section · 64 assemblies

The exploded parts diagrams for the 3JH2, grouped by system. Open a figure for its callout part numbers and per-variant quantities.

Bilge & accessory pumps

Fig 32 — OIL SUC./DRAIN & BILGE PUMP(OP)Fig 35 — BILGE PUMP(STD)(OPTIONAL)Fig 36 — BILGE PUMP(DX)(OPTIONAL)

Camshaft & timing gears

Fig 2 — GEAR HOUSINGFig 10 — CAMSHAFT & DRIVING GEAR

Controls

Fig 25 — REMOTE CONTROL SUPPORTFig 25 — SPEED REMOTE CONTROL DEVICEFig 36 — REMOTE CONTROL DEVICE(OP)

Cooling – fresh water

Fig 16 — COOLING FRESH WATER SYSTEMFig 17 — COOLING FRESH WATER COOLER

Cooling – sea water

Fig 7 — Cooling / Sea WaterFig 9 — Cooling Hoses, Thermostat, AnodesFig 15 — COOLING WATER SYSTEM(SEA WATER)Fig 15 — COOLING SEA WATER SYSTEMFig 37 — SEA WATER STRAINER(OPTIONAL)

Cylinder block

Fig 1 — CYLINDER BLOCK

Cylinder head & valves

Fig 6 — CYLINDER HEADFig 7 — BONNET

Electrical & instruments

Fig 8 — Electrical ComponentsFig 24 — ENGINE STOPFig 24 — ENGINE STOP DEVICEFig 26 — STARTING MOTORFig 28 — WIRE HARNESS & SENSORFig 28 — WIRE HARNESSFig 33 — INSTRUMENT PANEL(A TYPE)Fig 34 — INSTRUMENT PANEL(B TYPE)Fig 34 — ENGINE STOP DEVICE(OPTIONAL)Fig 35 — SENSOR(OPTIONAL)Fig 37 — INSTRUMENT PANEL(B TYPE)(OP)Fig 38 — INSTRUMENT PANEL(C TYPE)(OP)

Fuel injection pump & governor

Fig 18 — FUEL INJECTION PUMPFig 19 — FUEL FEED PUMPFig 21 — TIMERFig 23 — GOVERNOR

Fuel injectors & nozzles

Fig 20 — FUEL INJECTION PIPE & FUEL INJECTION VALVE

Fuel lines, tank & filter

Fig 6 — Fuel Injection / Oil LinesFig 22 — FUEL PIPEFig 32 — OIL/WATER SEPARATORFig 33 — FUEL TANK(OPTIONAL)

Gaskets, kits & spare parts

Fig 39 — GASKET SET(OPTIONAL)

Generator (genset)

Fig 27 — GENERATORFig 30 — GENERATOR(OPTIONAL)

Intake and Exhaust

Fig 8 — SUCTION MANIFOLDFig 9 — EXHAUST PIPE & MIXING ELBOWFig 10 — TURBOCHARGER & MIXING ELBOWFig 31 — SUCTION/WASTE OIL PUMPFig 31 — MIXING ELBOW(OPTIONAL)Fig 38 — REPAIR PART(OPTIONAL)Fig 39 — REPAIR SET(OPTIONAL)

Lubricating

Fig 3 — FLYWHEEL HOUSING& LUB. OIL SUMPFig 3 — FLYWHEEL HOUSING & LUB. OIL SUMPFig 12 — LUB. OIL SYSTEMFig 13 — LUB. OIL COOLERFig 14 — LUB. OIL PIPE

Mounting

Fig 5 — MOUNTING FOOTFig 5 — ENGINE BRACKET

Other / general

Fig 5 — Filters

Pistons, rods & liners

Fig 1 — Gaskets / Washers / O-ringsFig 2 — BearingsFig 3 — Liner, Pistons, RingsFig 11 — CRANKSHAFT & PISTON

Tools & labels

Fig 4 — LABELFig 29 — TOOL

Transmission & drive

Fig 30 — CLUTCH
📚 Manuals & Sources
Specs— none yet
Operator's Manual— none yet
Service / Workshop Manual— none yet
Parts Catalog / List— none yet
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Category
Marine
Engine family
3JH
Year range (approx)
1991–1998
Cylinders
3
Rated output
38 hp (27.9 kW)
Bore × stroke
82 × 86 mm
Displacement
1363 cc
Max rpm
3600
Continuous rpm
3400
Aspiration
Naturally aspirated
Dry weight (engine)
165 kg

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