Home / Engines / Yanmar 2GM20

Yanmar 2GM20

1983–200418 HP2-cylinderdiesel

Dieselraw water cooledinboardsaildrive

Two-cylinder diesel. One of the most common sailboat engines ever made. Found in thousands of 27-33ft boats worldwide.

Specifications

Power	18 HP @ 3,400 RPM	Cylinders	2
Displacement	635 cc (38.8 ci)	Bore x Stroke	75 x 72 mm
Fuel Type	Diesel	Aspiration	Naturally Aspirated
Cooling	Raw water	Drive	Inboard, Saildrive
Weight	114 kg (251 lb)	Dimensions (LxWxH)	638 x 455 x 495 mm
Fuel Use	3.38 L/hr	Oil Capacity	2 L
Transmission	KM2A

Parts for the Yanmar 2GM20

31 catalogued parts. Prices are reference figures; each “Find on Amazon” link opens a search for that part — confirm fitment against your engine's serial before ordering.

Cooling System (7)

Raw Water Pump — Yanmar 2GM/3GM
fits: 728270-42002
$358.83
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Sea Water Pump — Yanmar 2GM20/3GM30
fits: 128397-42500
$299.56
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Shaft Sea Water Pump Ysm — Yanmar 2GM/3GM/2GM20/3GM30
fits: 124070-42061
$131.24
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Pulley Water Pump — Yanmar 2GM/2GM20/3GM/3GM30/2YM20/3YM30
fits: 124070-42400
$40.22
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IMPELLER
fits: Yanmar 2GM , 3GM , 2GM20 , 3GM30, 2QM15, SB8, SB12, SVE8, SVE12, YSB8, YSB12, YSE8, YSE12,
$38.60
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Thermostat Gasket — Yanmar 1GM/1GM10/2GM/2GM20/3GM/3GM30
fits: 104211-49160
$9.53
· $15.78 ↗
IMPELLER GASKET
fits: Yanmar 2GM , 3GM , 2GM20 , 3GM30, 2QM15, SB8, SB12, SVE8, SVE12, YSB8, YSB12, YSE8, YSE12,
$4.46
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Fuel System (5)

Fuel Pump — Yanmar 2GM20/3GM30/3HM35
fits: 129301-52020
$281.56
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Yanmar Air Filter ( Intake Element )
fits: Yanmar 2GM, 2GMF, 3GM , 3GMF, 2GM20 , 2GM20F, 2GM20-YEU, 2GM20F-YEU, 3GM30, 3GM30F, 3GM30-
$36.18
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Yanmar Secondary Fuel Filter
fits: Yanmar 1GM, 1GM10, 2GM, 2GMF, 3GM, 3GMF, 2GM20, 2GM20F, 2GM20F-YEU, 2GM20-YEU, 3GM30, 3GM3
$9.42
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Yanmar Secondary Fuel Filter O-Ring 1A S-44.0
fits: Yanmar Fuel Filter # 104500-55710
$2.71
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Yanmar Nylon Secondary Fuel Filter Housing Bleed Washer
fits: Yanmar Fuel Filter # 104500-55710
$1.55
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Lubrication (3)

Oil Filter Kubota Onan — Yanmar
fits: 119305-35151
$10.58
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Yanmar Oil Filter
fits: Yanmar 1GM, 1GM10, 2GM, 2GMF, 3GM, 3GMF, 2GM20, 2GM20F, 2GM20F-YEU, 2GM20-YEU, 3GM30, 3GM3
$10.24
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Oil Filter Genuine — Yanmar
fits: 119305-35151
$9.53
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Belts (3)

Alternator Belt — Yanmar 2GM20/3GM30/3HM
fits: 128670-77350
$26.46
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Yanmar W/P V-Belt ( M19 )
fits: Yanmar 2GM , 2GMF, 3GM , 3GMF, 2GM20 , 2GM20F, 2GM20-YEU, 2GM20F-YEU, 3GM30, 3GM30F, 3GM30
$19.40
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Yanmar V-Belt ( A-31 )
fits: Yanmar 2GM20 , 3GM30, 3HM
$9.58
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Anodes (4)

Yanmar Zinc
fits: Yanmar 2QM20, 3QM30, 3QM30, 2GM , 3GM , 2GM20 , 2GM20-YEU, 3GM30, 3GM30-YEU, 3HM, 2QM15, Y
$6.58
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Yanmar 2GM20 engine anode 27210-200300
fits: 27210-200300
$5.73
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Yanmar Zinc Gasket
fits: Yanmar 2QM20, 3QM30, 1GM, 3QM30, 1GM10, 2GM , 3GM , 2GM20 , 2GM20-YEU, 3GM30, 3GM30-YEU, 3
$3.56
· $5.00 ↗
Zinc Plug Washer
fits: Yanmar 2QM20, 3QM30, 3QM30, 2GM , 3GM , 2GM20 , 2GM20-YEU, 3GM30, 3GM30-YEU, 3HM, 3HM35, 2
$2.42
· $21.95 ↗

Gaskets & Seals (3)

Cylinderhead Gasket Series — Yanmar 2GM20
fits: 128271-01911
$75.15
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Oil Pan Gasket — Yanmar 2GM/2GM20
fits: 124000-01751
$15.88
· $17.22 ↗
Valve Cover Gasket — Yanmar 2GM/2GM20
fits: 128270-11310
$8.47
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Exhaust (1)

Exhaust Bend In Stainless Steel Hdi Premium Hdilsb — Yanmar 2GM/2GM20
$5.29
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Service Kits (1)

Shaft Kit Pump — Yanmar 2GM20/2GM20F/2YM15/3GM30/3GM30F/3YM20
fits: 128990-42560
$105.85
· $164.67 ↗

Engine Mechanical (4)

Cylinder Head — Yanmar 2GM/2GM20
fits: 728272-11700
$3,370.22
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Piston Assy Original — Yanmar 1GM10/2GM20/3GM30
fits: 105311-22090
$205.34
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Connecting Rod Bearing Pair Standard Dimension Original — Yanmar 1GM/1GM10/2GM/2GM20/3GM/3GMD
fits: 705311-23600
$39.16
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Connecting Rod Bearing Pair Standard Dimension — Yanmar 1GM/1GM10/2GM/2GM20/3GM/3GMD
fits: 705311-23600
$31.75
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