Yanmar SB12
1976–198012 HP1-cylinderdiesel
Dieselraw water cooledinboard
Transitional single-cylinder between Y-series and GM.
Specifications
| Power | 12 HP @ 3,600 RPM | Cylinders | 1 |
| Displacement | 318 cc (19.4 ci) | Bore x Stroke | 75 x 72 mm |
| Fuel Type | Diesel | Aspiration | Naturally Aspirated |
| Cooling | Raw water | Drive | Inboard |
| Weight | 58 kg (128 lb) | Dimensions (LxWxH) | 662 x 520 x 678 mm |
| Fuel Use | 2.25 L/hr |
Parts for the Yanmar SB12
19 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 (8)
- THERMOSTAT$51.84Buy on
↗ 
Jabsco Neoprene Pin Drive Pump Impeller (6 Blades, 40mm OD x 19mm W)$45.17Search →
Johnson MC97 Pump Impeller 09-806B-1 for Johnson F35 Pumps (6 Blade)$39.29Buy on ↗- IMPELLERfits: Yanmar 2GM , 3GM , 2GM20 , 3GM30, 2QM15, SB8, SB12, SVE8, SVE12, YSB8, YSB12, YSE8, YSE12,$38.60Buy on ↗
Orbitrade 8-24001 Impeller Kit for Yanmar Engine Cooling Pumps$30.23Buy on ↗- IMPELLER GASKETfits: Yanmar 2GM , 3GM , 2GM20 , 3GM30, 2QM15, SB8, SB12, SVE8, SVE12, YSB8, YSB12, YSE8, YSE12,$4.46Buy on ↗
- SearchYanmar raw water pump (sea water pump) assembly, complete, for SB8/SB12/SVE8/SVE12fits: pump body 128270-42000 / updated 721575-42702 →
- Buy onYanmar raw water pump flexible impeller (6 blades, round key slot), fits SB12/YSB12fits: 104211-42070 / 104211-42090 (older Yanmar refs) ↗
Fuel System (4)
Orbitrade 8-55710 Fuel Filter Element for Yanmar Diesel Engines$15.80Buy on ↗- Yanmar Secondary Fuel Filterfits: Yanmar 1GM, 1GM10, 2GM, 2GMF, 3GM, 3GMF, 2GM20, 2GM20F, 2GM20F-YEU, 2GM20-YEU, 3GM30, 3GM3$9.42Buy on ↗
- Yanmar Secondary Fuel Filter O-Ring 1A S-44.0fits: Yanmar Fuel Filter # 104500-55710$2.71Buy on ↗
- Yanmar Nylon Secondary Fuel Filter Housing Bleed Washerfits: Yanmar Fuel Filter # 104500-55710$1.55Search →
Belts (1)
- Yanmar V-Belt (M31)fits: Yanmar 2QM15, SB12, SVE12, 1GM10 (Serial #E00336 & after)$19.00Search →
Anodes (6)
Zinc Pencil Engine Anode for Yanmar (M8 Thread)$20.78Search →- Yanmar Zincfits: Yanmar SB8, SB12, SVE8, SVE12, YSE8, YSE12$9.88Buy on ↗
Zinc Pencil Engine Anode for Yanmar YS (M8 Thread)$6.63Search →
Orbitrade 8-41300 Zinc Anode for Yanmar Engines (M8)$3.94Buy on ↗- Yanmar Zinc Gasketfits: Yanmar 2QM20, 3QM30, 1GM, 3QM30, 1GM10, 2GM , 3GM , 2GM20 , 2GM20-YEU, 3GM30, 3GM30-YEU, 3$3.56
· $5.00 ↗ - Yanmar Zinc Plate Gasketfits: Yanmar SB8, SB12, SVE8, SVE12, YSE8, YSE12$2.72Search →
Part data aggregated from marine-diesel parts catalogues. As an Amazon Associate, SailPages earns from qualifying purchases.
