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Westerbeke 12B marine engine

Westerbeke 12B

1987–present12 HP2-cylinderdiesel
Dieselheat exchanger cooledinboard
Manufacturer PageDocumentation

Two-cylinder. Kubota-based. Compact and quiet.

Specifications

Power12 HP @ 3,200 RPMCylinders2
Displacement570 cc (34.8 ci)Bore x Stroke68 x 78 mm
Fuel TypeDieselAspirationNaturally Aspirated
CoolingHeat exchangerDriveInboard
Weight102 kg (225 lb)Fuel Use2.25 L/hr

Parts for the Westerbeke 12B

10 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 (1)
  • Pressure Cap
    fits: Universal M-50B Universal M-12 Universal M-15 Universal M-18 Universal M-20 Universal M-25
    $10.80
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Fuel System (3)
  • Lift Pump Filter
    fits: Westerbeke 12B Two, 35D Three, 35C Three, 55A Four
    $45.00
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  • Filter (electric lift pump)
    fits: Westerbeke W13, W21, W27, W33, W52, 12C Two, 38B Four, 63B Four, 63C Four, W13A, W18, W21A
    $32.00
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  • Fuel Filter
    fits: Westerbeke W13, W21, W27, W33, 12C Two, 20B Two, 30B Three, 38B Four, 44A Four, 44B Four,
    $14.40
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Lubrication (1)
  • Oil Filter
    fits: Westerbeke 11A One, W13, W21, W27, 12B Two, 12C Two, 20B Two, 30B Three, 35D Three, 44A Fo
    $16.40
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Belts (2)
  • Alternator Belt Std.
    fits: Westerbeke W10 Two, W12B Two, 12B Two
    $69.70
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  • Raw W/P Belt
    fits: Westerbeke 12B Two, W10 Two, W12B Two
    $55.10
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Anodes (1)
  • Zinc
    fits: Universal M-25 XPB, 12C Two, 20B Two, 30B Three, 35D Three, 38B Four, 44A Four, 44B Four,
    $14.60
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Electrical (1)
  • Glowplug
    fits: Westerbeke 12B Two, W10 Two, W12B Two
    $76.80
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Service Kits (1)

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