Yanmar 1GM10

• 1 cyl
• 0.318 l
• 9.1 hp
• Diesel

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Troubleshooting

Starting problems

• Boat engine won't start after the winter
• Air in the fuel system – the diesel will not start
• Engine won't start
• Starter motor clicks or does not crank

Runs rough, stalls or loses power

• Boat engine dies at idle or when shifted into gear
• Boat engine hesitates or dies on acceleration
• The boat engine knocks or makes strange noises
• Boat engine stops after a while
• Boat engine does not reach full revs at full throttle

Smoke and exhaust

• The boat engine smokes blue – burning oil
• White smoke from the boat engine exhaust
• Diesel engine emits black smoke
• Engine smokes or loses power

Cooling and temperature

• Engine not cooling – weak or no cooling water
• Temperature alarm – engine overheating

Oil, water and fuel

• Water in the fuel or tank of the boat engine
• Water in the engine oil – the oil is grey or milky

Electrics, alarms and fault codes

• Battery not charging – charge warning light is on
• The alarm is sounding – what do the warning lights mean?
• Oil pressure alarm on the boat engine – low oil pressure

Drive, gearbox and trim

• Drive knocks or vibrates
• Gear will not engage or jumps out

Manuals

• Official

  Operation Manual 1GM10 (Yanmar) ↗ (external link)

  yanmar.com blocks automated checks (HTTP 403); document and its contents confirmed via search engine index 2026-10-20

  EN · PDF

Exploded views & parts catalogs

• Shop

  Operation Manual 1GM10/1GM10C/1GM10V ↗ (external link)
  EN · PDF

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Service guides

Replacing the impeller →Winterize a boat engine →

Frequently asked questions about Yanmar 1GM10

Where can I find the owner's manual for Yanmar 1GM10?

Links to owner's manuals and workshop manuals are available under Manuals.

How many cylinders does Yanmar 1GM10 have?

Yanmar 1GM10 has 1 cylinder.

What fuel does the Yanmar 1GM10 use?

Yanmar 1GM10 runs on diesel.

Sources

• Sextan (Yanmar dealer): Operation Manual 1GM10 – technical data ↗ (external link)
• Wikipedia: Yanmar ↗ (external link)
• Operation Manual 2GM20(F)/3GM30(F) (Yanmar, Osaka; archived copy) ↗ (external link)