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3JH40 Marine

Yanmar 3JH40 · 3JH family: specifications, its industrial/tractor base engine, cross-referenced parts and where to buy them.

🚜 Base engine confirmed

The Yanmar 3JH40 is a Yanmar marine diesel in the 3JH40 family. Yanmar designs and sells both marine and industrial diesels; internal service parts for this family are listed in the 3JH40 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)

40 hp29.4 kW
1642 ccdisplacement
88×90 mmbore × stroke
3-cylcylinders
192 kgengine dry
13 kggearbox
from 2018year range (approx)
NAaspiration

common-rail; Yanmar publishes max only

📋 Full specifications 13 🚜 Industrial / tractor base 🔧 Aftermarket 33
Cheaper-part coverage · 4/8
🚜 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.

Second Alternator OEM option

The OEM parts book lists a factory second / extra alternator option for the 3JH40 — not standard equipment. Use the kit or hardware below when fitting a house-bank / domestic alternator.

Fig 41 — ALTERNATOR KIT(2ND)(OPTIONAL)Fig 42 — ALTERNATOR KIT(2ND)(ISOLATED TYPE)(OPTIONAL)
Part No.DescriptionIn figure
129677-77600 ALTERNATOR KIT, JHCR Fig 41 — ALTERNATOR KIT(2ND)(OPTIONAL)
129677-77630 BRACKET, 2ND Fig 41 — ALTERNATOR KIT(2ND)(OPTIONAL)
129677-77640 ALTERNATOR KIT,ISOLA Fig 42 — ALTERNATOR KIT(2ND)(ISOLATED TYPE)(OPTIONAL)
129677-77670 HARNESS, 2ND ALT 12V Fig 41 — ALTERNATOR KIT(2ND)(OPTIONAL)
129677-77680 HARNESS, 2ND ALT 24V Fig 41 — ALTERNATOR KIT(2ND)(OPTIONAL)

Parts by section · 67 assemblies

The exploded parts diagrams for the 3JH40, grouped by system. Open a figure for its callout part numbers and per-variant quantities.

Belts & pulleys

Fig 8 — COVER(BELT)Fig 24 — V-BELT

Camshaft & timing gears

Fig 2 — GEAR HOUSINGFig 17 — CAMSHAFT & DRIVING GEAR

Controls

Fig 65 — REMOTE CONTROL CABLE(OPTIONAL)

Cooling – fresh water

Fig 23 — COOLING PUMP(FRESH WATER)Fig 25 — COOLER(FRESH WATER)Fig 27 — COOLING PIPE(FRESH WATER)Fig 28 — HOT WATER CONNECTION(OPTIONAL)

Cooling – sea water

Fig 22 — COOLING PUMP(SEA WATER)Fig 26 — COOLING PIPE(SEA WATER)

Crankshaft & flywheel

Fig 3 — FLYWHEEL HOUSINGFig 18 — CRANKSHAFT & FLYWHEEL

Cylinder block

Fig 1 — CYLINDER BLOCKFig 9 — COVER(ENGINE)

Cylinder head & valves

Fig 10 — CYLINDER HEADFig 11 — BONNETFig 64 — REMOTE CONTROL HEAD(OPTIONAL)

Electrical & instruments

Fig 36 — ELECTRONIC CONTROL UNIT(ECU) & BRACKETFig 37 — STARTER MOTORFig 38 — RELAYFig 39 — ALTERNATOR(EARTH TYPE)Fig 40 — ALTERNATOR(EARTH FLOAT TYPE REMODEL KIT)(OPTIONAL)Fig 43 — ALTERNATOR(INNER PARTS)Fig 44 — ALTERNATOR(INNER PARTS)(ISOLATED TYPE)Fig 45 — WIRE HARNESSFig 46 — (52B)TERMINAL ADAPTER(FOR A15, B25, C35 PANEL)Fig 50 — ELECTRIC PARTS(FOR SD60)Fig 52 — EMERGENCY STOP SWITCHFig 53 — INSTRUMENT PANEL(A15)(MEDALLION)Fig 54 — INSTRUMENT PANEL(B25)(MEDALLION)Fig 55 — INSTRUMENT PANEL(C35)(MEDALLION)Fig 56 — (52A)SENSOR(THROTTLE)(FOR A15, B25, C35 PANEL)Fig 57 — EMERGENCY STOP SWITCH(FOR A15, B25, C35 PANEL)(OPTIONAL)Fig 66 — (57A)DISPLAY(FOR A15, B25, C35 PANEL)(OPTIONAL)Fig 67 — (57B)CAN CONVERTOR(FOR A15, B25, C35 PANEL)(OPTIONAL)Fig 68 — (57C)VC10(SINGLE ENGINE)(OPTIONAL)Fig 69 — (57D)VC10(TWIN ENGINE)(OPTIONAL)Fig 70 — (57E)VC10(DISPLAY & PANEL)(INNER PARTS)Fig 71 — (57F)CAP(THROTTLE CONNECTOR)(FOR VC10)

Fuel injectors & nozzles

Fig 30 — FUEL INJECTION VALVE

Fuel lines, tank & filter

Fig 29 — FUEL SUPPLY PUMPFig 31 — FUEL FILTERFig 32 — FUEL PRE-FILTER(HULL SIDE)Fig 34 — FUEL INJECTION PIPEFig 35 — FUEL PIPE

Intake and Exhaust

Fig 12 — SUCTION MANIFOLDFig 13 — AIR INTAKE SILENCERFig 14 — MIXING ELBOW(U TYPE)Fig 15 — MIXING ELBOW(L TYPE)Fig 16 — MIXING ELBOW(L TYPE)(FOR BJT)

Lubricating

Fig 4 — OIL SUMPFig 5 — BREATHERFig 20 — LUB. OIL SYSTEMFig 21 — DIPSTICK

Mounting

Fig 7 — MOUNTING FOOTFig 60 — FLEXIBLE MOUNT(FOR KM35A, KM35P)Fig 61 — FLEXIBLE MOUNT(FOR SD60)

Other / general

Fig 33 — COMMON RAIL

Pistons, rods & liners

Fig 19 — PISTON & CONNECTING ROD

Tools & labels

Fig 6 — LABELFig 58 — (63A)TOOLFig 63 — LABEL(SAFETY)(BUNDLED ITEMS)

Transmission & drive

Fig 47 — (52C)EXTENSION HARNESS(FOR A15, B25, C35 PANEL)Fig 48 — CLUTCH(OPTIONAL)Fig 49 — DAMPER DISC(OPTIONAL)Fig 51 — PROPELLER NUT(FOR SD60)(OPTIONAL)
📚 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)
from 2018
Cylinders
3
Rated output
40 hp (29.4 kW)
Bore × stroke
88 × 90 mm
Displacement
1642 cc
Max rpm
3000
Continuous rpm
3000
Aspiration
Naturally aspirated
Dry weight (engine)
192 kg
Gearbox
13 kg
With standard gearbox
205 kg

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