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Yanmar YSB12 marine engine

Yanmar YSB12

1967–198012 HP1-cylinderdiesel
Dieselraw water cooledinboard
Manufacturer PageDocumentation

Higher-RPM YSB variant.

Specifications

Power12 HP @ 3,600 RPMCylinders1
Displacement287 cc (17.5 ci)Bore x Stroke70 x 75 mm
Fuel TypeDieselAspirationNaturally Aspirated
CoolingRaw waterDriveInboard
Weight60 kg (132 lb)Fuel Use2.25 L/hr
Oil Capacity1.9 L

Parts for the Yanmar YSB12

20 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)
  • Jabsco Neoprene Pin Drive Pump Impeller (6 Blades, 40mm OD x 19mm W)
    $45.17
    SearchAmazon →
  • Johnson MC97 Pump Impeller 09-806B-1 for Johnson F35 Pumps (6 Blade)
    $39.29
    Buy onAmazon ↗
  • IMPELLER
    fits: Yanmar 2GM , 3GM , 2GM20 , 3GM30, 2QM15, SB8, SB12, SVE8, SVE12, YSB8, YSB12, YSE8, YSE12,
    $38.60
    Buy onAmazon ↗
  • Orbitrade 8-24001 Impeller Kit for Yanmar Engine Cooling Pumps
    $30.23
    Buy onAmazon ↗
  • Yanmar Raw Water Pump V-Belt
    fits: Yanmar YSB12, YSE12 (Replaces # 104514-42780 )
    $13.03
    Buy onAmazon ↗
  • IMPELLER GASKET
    fits: Yanmar 2GM , 3GM , 2GM20 , 3GM30, 2QM15, SB8, SB12, SVE8, SVE12, YSB8, YSB12, YSE8, YSE12,
    $4.46
    Buy onAmazon ↗
  • Thermostat (42C opening) for raw-water-cooled Yanmar YSB8/YSB12 (also fits 1GM/2GM/3GM/3HM/3QM/YSE/YSM series)
    fits: 124233-49250 / 181130-49200
    Buy onAmazon ↗
Fuel System (4)
  • Orbitrade 8-55710 Fuel Filter Element for Yanmar Diesel Engines
    $15.80
    Buy onAmazon ↗
  • Yanmar Secondary Fuel Filter
    fits: Yanmar 1GM, 1GM10, 2GM, 2GMF, 3GM, 3GMF, 2GM20, 2GM20F, 2GM20F-YEU, 2GM20-YEU, 3GM30, 3GM3
    $9.42
    Buy onAmazon ↗
  • Yanmar Secondary Fuel Filter O-Ring 1A S-44.0
    fits: Yanmar Fuel Filter # 104500-55710
    $2.71
    Buy onAmazon ↗
  • Yanmar Nylon Secondary Fuel Filter Housing Bleed Washer
    fits: Yanmar Fuel Filter # 104500-55710
    $1.55
    SearchAmazon →
Lubrication (1)
  • Lube oil strainer / oil filter element for Yanmar YSB12 (single-cylinder marine diesel has a strainer element, not a spin-on cartridge)
    fits: 104271-35130
    SearchAmazon →
Belts (2)
  • Yanmar V-Belt (HM-23)
    fits: Yanmar 2QM15, YSB12, YSE12
    $16.66
    eBay· $12.95 ↗
  • Drive Belt — Yanmar 2QM15/YSE
    fits: 104514-77350
    $11.63
    eBay· $12.95 ↗
Anodes (6)
  • Orbitrade 8-20030 Zinc Anode for Yanmar Engines
    $21.89
    SearchAmazon →
  • Zinc Pencil Engine Anode for Yanmar (M8 Thread)
    $20.78
    SearchAmazon →
  • Zinc Pencil Engine Anode for Yanmar YS (M8 Thread)
    $6.63
    SearchAmazon →
  • Yanmar Zinc
    fits: Yanmar 2QM20, 3QM30, 3QM30, 2GM , 3GM , 2GM20 , 2GM20-YEU, 3GM30, 3GM30-YEU, 3HM, 2QM15, Y
    $6.58
    Buy onAmazon ↗
  • Yanmar Zinc Gasket
    fits: Yanmar 2QM20, 3QM30, 1GM, 3QM30, 1GM10, 2GM , 3GM , 2GM20 , 2GM20-YEU, 3GM30, 3GM30-YEU, 3
    $3.56
    eBay· $5.00 ↗
  • Zinc Plug Washer
    fits: Yanmar 2QM20, 3QM30, 3QM30, 2GM , 3GM , 2GM20 , 2GM20-YEU, 3GM30, 3GM30-YEU, 3HM, 3HM35, 2
    $2.42
    eBay· $21.95 ↗

Part data aggregated from marine-diesel parts catalogues. As an Amazon Associate, SailPages earns from qualifying purchases.

Sailboats with Yanmar YSB12(1)

HUNTER 30
HUNTER 30
Hunter Marine (USA) · 30.4ft · 1973–1983