Yanmar 2GM20

• 2 cyl
• 0.636 l
• 16 hp
• Diesel

Save my engine

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

• Archives

  Operation Manual 2GM20/3GM30 (F/C/V) ↗ (external link)
  EN · PDF

Exploded views & parts catalogs

• Shop

  Sextan: Yanmar manuals ↗ (external link)

  Dealers that publish Yanmar owner's manuals

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Related models

Yanmar 1GM10

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1 cyl · 0.318 l · 9.1 hp · Diesel

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Yanmar 2GM20F

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2 cyl · 0.636 l · 16 hp · Diesel

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Yanmar 3GM30

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3 cyl · 0.954 l · 24.1 hp · Diesel

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Yanmar 3GM30F

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3 cyl · 0.954 l · 24.1 hp · Diesel

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Service guides

Replacing the impeller →Winterize a boat engine →

Frequently asked questions about Yanmar 2GM20

Where can I find the owner's manual for Yanmar 2GM20?

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

How many cylinders does Yanmar 2GM20 have?

Yanmar 2GM20 has 2 cylinders.

What fuel does the Yanmar 2GM20 use?

Yanmar 2GM20 runs on diesel.

Sources

• Operation Manual 2GM20(F)/3GM30(F) (Yanmar, Osaka; archived copy) ↗ (external link)
• Wikipedia: Yanmar ↗ (external link)