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1GM Marine

Yanmar 1GM · 1GM family: specifications, its industrial/tractor base engine, cross-referenced parts and where to buy them.

🚜 Base engine confirmed

The Yanmar 1GM is a Yanmar-designed single-cylinder marine diesel (first-gen GM series source

7.5 hp5.5 kW
1-cylcylinders
1980–1983year range (approx)
NAaspiration

first-gen GM 1-cyl raw-water; 7.5hp (toad model-ID); smaller CI than 1GM10 — bore/stroke verify

📋 Full specifications 🚜 Industrial / tractor base 🔧 Aftermarket 38
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.

Parts by section · 70 assemblies

The exploded parts diagrams for the 1GM, grouped by system. Open a figure for its callout part numbers and per-variant quantities.

Camshaft & timing gears

Fig 3 — GEAR HOUSINGFig 17 — CAMSHAFT

Controls

Fig 43 — SPEED REMOTE CONTROLFig 60 — SINGLE LEVER CONTROL(OPTIONAL)Fig 69 — CONTROL DEVICE

Cooling – fresh water

Fig 27 — COOLING FRESH WATER PUMPFig 28 — COOLING FRESH WATER COOLERFig 29 — COOLING FRESH WATER COOLER(3HMF)Fig 30 — SUB-TANKFig 31 — COOLING WATER PIPEFig 32 — COOLING WATER PIPE(2,3GMF,3HMF)Fig 33 — THERMOSTATFig 74 — COOLING FRESH WATER PUMP & SUB-TANKFig 76 — COOLING WATER PIPE & V-BELT

Cooling – sea water

Fig 26 — COOLING SEA WATER PUMPFig 57 — LUB. OIL WASTE,BILGE PUMP & KINGSTON COCK(OPTIONAL)

Crankshaft & flywheel

Fig 4 — FLYWHEEL HOUSINGFig 18 — CRANKSHAFT & FLYWHEEL

Cylinder block

Fig 1 — CYLINDER BLOCK(1,2GM(F))Fig 2 — CYLINDER BLOCK

Cylinder head & valves

Fig 11 — CYLINDER HEAD

Electrical & instruments

Fig 42 — ENGINE STOP DEVICFig 44 — STARTING MOTORFig 45 — STARTING MOTOR COMPONENT PART(12V/1.0KW)Fig 46 — STARTING MOTOR COMPONENT PART(12V/1.8KW)Fig 52 — WIRE HARNESSFig 61 — INSTRUMENT PANEL(M1/M2-TYPE)(OPTIONAL)Fig 62 — INSTRUMENT PANEL(S-TYPE/OPTIONAL)

Fuel injection pump & governor

Fig 34 — FUEL INJECTION PUMPFig 35 — FUEL FEED PUMPFig 39 — GOVERNOR DRIVING

Fuel injectors & nozzles

Fig 36 — FUEL INJECTION VALVE

Fuel lines, tank & filter

Fig 37 — FUEL STRAINERFig 38 — FUEL PIPEFig 41 — FUEL CONTROLLERFig 58 — FUEL OIL TANK & BATTERY SWITCH(OPTIONAL)

Gaskets, kits & spare parts

Fig 65 — GASKET KIT(OPTIONAL)

Generator (genset)

Fig 47 — GENERATOR(AC)Fig 48 — GENERATOR COMPONENT PART(121370-77200)Fig 49 — GENERATOR COMPONENT PART(128170-77200)Fig 50 — GENERATOR COMPONENT PART(128170-77201)Fig 51 — GENERATOR COMPONENT PART(128270-77200)

Intake and Exhaust

Fig 13 — AIR INTAKE SILENCERFig 14 — EXHAUST MANIFOLDFig 15 — MIXING ELBOWFig 16 — MIXING ELBOW(U-TYPE/OPTIONAL)Fig 64 — REPAIR KIT(OPTIONAL)

Lubricating

Fig 5 — LUB. OIL SUMPFig 8 — BREATHERFig 21 — LUB. OIL PUMPFig 22 — LUB. OIL DIPSTICKFig 23 — LUB. OIL STRAINERFig 24 — LUB. OIL PRESSURE CONTROL VALVEFig 25 — LUB. OIL PIPE

Mounting

Fig 9 — ENGINE LIFTERFig 10 — MOUNTING FOOTFig 56 — FLEXIBLE MOUNTING(OPTIONAL)

Other / general

Fig 6 — MAIN METAL HOUSING(1,2GM(F))Fig 7 — MAIN METAL HOUSINGFig 40 — REGULATOR LINKS

Pistons, rods & liners

Fig 19 — PISTONFig 20 — CONNECTING ROD

Tools & labels

Fig 55 — TOOLFig 63 — SPECIAL TOOL(OPTIONAL)

Transmission & drive

Fig 53 — CLUTCHFig 54 — CLUTCH REMOTE CONTROLFig 59 — COUPLING(TAPER & SLIT TYPE/OPTIONAL)Fig 66 — CLUTCH HOUSINGFig 67 — INPUT SHAFT & IDLE GEAR SHAFTFig 68 — 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
1GM
Year range (approx)
1980–1983
Cylinders
1
Rated output
7.5 hp (5.5 kW)
Max rpm
3600
Aspiration
Naturally aspirated

Related 1GM engines

1GM101GM10C1GM10V