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4JH Marine

Yanmar 4JH · 4JH family: specifications, its industrial/tractor base engine, cross-referenced parts and where to buy them.

🚜 Base engine confirmed

The Yanmar 4JH is a Yanmar marine diesel in the 4JH family. Yanmar designs and sells both marine and industrial diesels; internal service parts for this family are listed in the 4JH 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)

44 hp32.4 kW

1644 ccdisplacement

78×86 mmbore × stroke

4-cylcylinders

1983–1989year range (approx)

NAaspiration

NA; ~44mhp mapped from Marine Specialists JH-E; bore confirmed 4x78x86 catalog p2; hp=verify

📋 Full specifications 🚜 Industrial / tractor base 🔧 Aftermarket 74

Cheaper-part coverage · 5/8

🚜 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 · 119 assemblies

The exploded parts diagrams for the 4JH, grouped by system. Open a figure for its callout part numbers and per-variant quantities.

Bilge & accessory pumps

Fig 58 — BILGE PUMP 12V

Camshaft & timing gears

Fig 2 — GEARS HOUSING Fig 15 — CAMSHAFT Fig 22 — IDLE GEAR

Controls

Fig 40 — REMOTE CONTROL DEVICE Fig 46 — SPEED REMOTE CONTROL DEVICE Fig 71 — SINGLE LEVER CONTROL Fig 72 — MORESE CABLE Fig 76 — MORSE CABLE Fig 83 — CONTROL DEVICE

Cooling – fresh water

Fig 17 — INTER COOLER Fig 31 — COOLING FRESH WATER PUMP Fig 32 — COOLING FRESH WATER COOLER Fig 34 — COOLING FRESH WATER PIPE Fig 34 — COOLING FRESH WATER LINES Fig 35 — THERMOSTAT

Cooling – sea water

Fig 30 — COOLING SEA WATER PUMP Fig 59 — KINGSTON COCK Fig 33 — COOLING SEA WATER PIPE Fig 33 — COOLING SEA WATER LINES Fig 60 — SEA WATER FILTER

Crankshaft & flywheel

Fig 3 — FLYWHEEL HOUSING Fig 18 — CRANKSHAFT Fig 19 — FLYWHEEL

Cylinder block

Fig 1 — CYLINDER BLOCK

Cylinder head & valves

Fig 11 — CYLINDER HEAD Fig 12 — BONNET

Electrical & instruments

Fig 45 — ENGINE STOP DEVICE Fig 39 — COLD START DEVICE Fig 47 — STARTING MOTOR Fig 43 — WIRE HARNESS & SENSOR Fig 44 — INSTRUMENT PANEL (B TYPE)Fig 48 — ELECTRIC BILGE PUMP(12V)Fig 51 — INSTRUMENT PANEL (C TYPE)Fig 54 — STARTING MOTOR COMPONENT PARTS Fig 55 — INSTRUMENT PANEL(NEW B-4 TYPE)Fig 56 — INSTRUMENT PANEL(NEW C-3 TYPE)Fig 62 — ENGINE STOP CABLE Fig 63 — WIRE HARNESS(FOR B2 TYPE PANEL)Fig 64 — WIRE HARNESS(FOR C,D PANEL)Fig 64 — WIRE HARNESS(FOR B2 TYPE PANEL Fig 65 — BATTERY SWITCH Fig 73 — INSTRUMENT PANEL(B-2 TYPE)Fig 74 — INSTRUMENT PANEL(C TYPE)Fig 75 — INSTRUMENT PANEL(D TYPE)

Fuel injection pump & governor

Fig 36 — FUEL INJECTION PUMP Fig 39 — TIMER Fig 32 — TIMER(PREVIOUS)Fig 44 — GOVERNOR Fig 36 — GOVERNOR(NOT BOOST COMPEMSATOR Fig 37 — FUEL FEED PUMP Fig 37 — GOVERNOR(FOR B00ST COMPEMSATOR

Fuel injectors & nozzles

Fig 30 — FUEL INJECTION VALVE Fig 38 — FUELINJECTION VALVE

Fuel lines, tank & filter

Fig 34 — FUEL LINE Fig 40 — FUEL STRAINER Fig 41 — FUEL INJECTION PIPE Fig 41 — FUEL INJECTION LINES Fig 42 — FUEL PIPE Fig 42 — FUEL LINES Fig 43 — FUEL RETURN PIPE Fig 43 — FUEL RETURN LINES Fig 61 — FUEL TANK

Gaskets, kits & spare parts

Fig 52 — SPARE PARTS Fig 78 — GASKET SET

Generator (genset)

Fig 48 — GENERATOR Fig 55 — GENERATOR COMPONENT PARTS

Intake and Exhaust

Fig 13 — SUCTION MANIFOLD Fig 13 — EXHAUST BEND Fig 14 — MIXING ELBOW Fig 16 — TURBOCHARGER Fig 17 — AIR COOLER Fig 22 — LUB. OIL SUCTION PIPE Fig 26 — LUB.OIL SUCTION PIPE Fig 53 — TURBINE(INNER PARTS)Fig 54 — TURBOCHARGER COMPONENT PARTS Fig 57 — OIL SUCTION/DRAIN PUMP Fig 66 — AIR HEATER Fig 77 — REPAIR SET Fig 85 — (53A)TURBINE(INNER PARTS)Fig 86 — TURBOCHARGEAR COMPONENT PARTS

Lubricating

Fig 4 — LUB. OIL SUMP Fig 4 — LUB.OIL SUMP Fig 7 — BREATHER Fig 24 — LUB.OIL COOLER Fig 23 — LUB.OIL PUMP Fig 23 — LUB. OIL PUMP Fig 23 — LUB. OIL PIPE Fig 25 — LUB.OIL DIPSTICK Fig 27 — LUB.OIL STRAINER Fig 27 — LUB. OIL STRAINER Fig 28 — LUB.OIL PIPE Fig 28 — LUB. OIL LINES

Mounting

Fig 10 — ENGINE BRACKET Fig 8 — ENGINE LIFTER

Other / general

Fig 20 — BARANCER Fig 46 — CLUCH ASSY(YX-10)Fig 47 — CLUCH ASSY (YX-15)

Pistons, rods & liners

Fig 5 — MAIN BEARING Fig 6 — CAMSHAFT BEARING Fig 19 — PISTON & CONNECTING ROD Fig 20 — PISTON Fig 21 — CONNECTING ROD Fig 29 — PISTON JET

Tools & labels

Fig 9 — LABELS Fig 51 — TOOLS Fig 52 — SPECIAL TOOL Fig 54 — SAFETY LABEL Fig 84 — TOOLS(OPTIONAL PARTS)

Transmission & drive

Fig 49 — CLUTCH (KBW-21)Fig 50 — CLUTCH REMOTE CONTROL Fig 68 — SOLID COUPLING Fig 69 — STRAIGHT COUPLING Fig 76 — EXTENSION WIRE Fig 70 — SLIT COUPLING Fig 79 — CLUTCH HOUSING Fig 80 — INPUT SHAFT Fig 81 — COUNTER SHAFT Fig 82 — OUTPUT SHAFT

📚 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: 4JH
Year range (approx): 1983–1989
Cylinders: 4
Rated output: 44 hp (32.4 kW)
Bore × stroke: 78 × 86 mm
Displacement: 1644 cc
Max rpm: 3600
Continuous rpm: 3400
Aspiration: Naturally aspirated

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