MarineDieselXRef
Home › Engines › 1GM

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 39
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
More📖 Boat Inboard Engine Manuals Boat Manuals

External links — we host none of these documents.

1GM — Affiliate Parts Search

eBayAliExpress

eBay and AliExpress links are affiliate links. They help pay for the site, at no extra cost to you. More

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