YSM12 Marine
Yanmar YSM12 · YSM family: specifications, its industrial/tractor base engine, cross-referenced parts and where to buy them.
🚜 Base engine confirmed
The Yanmar YSM12 is a Yanmar-designed horizontal single-cylinder marine diesel (Y-series source
12 hp8.8 kW
331 ccdisplacement
75×75 mmbore × stroke
1-cylcylinders
1977–1980year range (approx)
NAaspiration
horizontal Y-series 12hp; same 75x75 family as YSM8; rpm_cont verify; years toad model-ID
Cheaper-part coverage · 2/8
🚜 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 · 21 assemblies
The exploded parts diagrams for the YSM12, grouped by system. Open a figure for its callout part numbers and per-variant quantities.
Cooling – sea water
Cylinder block
Cylinder head & valves
Electrical & instruments
Fuel
Intake and Exhaust
Lubrication / seals
Starting
Fig 15-A — MANUAL STARTING (CHAIN) DEVICEFig 15-B — MANUAL STARTING [CHAIN] DEVICEFig 26 — STARTING MOTOR
Tools & kits
Transmission & drive
📚 Manuals & Sources
Specs— none yet
Operator's Manual— none yet
Service / Workshop Manual— none yet
Parts Catalog / List— none yet
External links — we host none of these documents.
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- Category
- Marine
- Engine family
- YSM
- Year range (approx)
- 1977–1980
- Cylinders
- 1
- Rated output
- 12 hp (8.8 kW)
- Bore × stroke
- 75 × 75 mm
- Displacement
- 331 cc
- Max rpm
- 3200
- Aspiration
- Naturally aspirated