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Yanmar 128271-01911 is the cylinder head gasket for the Yanmar 2GM20 two cylinder marine diesel engine. This aftermarket version is cut to the same bore, bolt hole and water passage pattern as the original.
Sold as one unit. Check the number on your old part, or in the parts manual for your machine, before ordering.
| Part Type | Cylinder Head Gasket |
| Replaces | Yanmar 128271-01911 |
| Engine | Yanmar 2GM20, 2GM20F |
| Cylinders | 2 |
| Fits | Yanmar 2GM20, 2GM20F, 2GM20-YEU and 2GM20F-YEU marine diesel engines |
| Condition | New, aftermarket |
| Stat. HS-Code | 848410 |
Yanmar machines
Check the part number on your old unit before ordering.
| Yanmar Part No.(SPM Part No.) | Fits |
|---|---|
| 128271-01911(SPM-HEP-2913) | Yanmar 2GM20, 2GM20F, 2GM20-YEU and 2GM20F-YEU marine diesel engines |
Coolant in the oil or oil in the coolant
Milky oil, oil in the radiator or a falling coolant level with no outside leak are classic signs of a failed head gasket.
Overheating and pressure in the cooling system
Combustion gas pushed into the water jacket pressurises the radiator, blows coolant out of the overflow and makes the engine run hot under load.
Low compression and white smoke
A gasket blown between cylinders or into a water passage shows as a misfire, low compression on one or two cylinders and white smoke at start up.
Fitting tips
Check the head and block for flatness, clean both faces, use new head bolts where the engine maker calls for them and tighten in sequence to the specified torque.
We check what other aftermarket sellers charge for this same part. Their prices on the date we checked:
| Seller | Price | Checked |
|---|---|---|
| JSK Automotive | USD 22.77 | 6 Oct 2026 |
| eBay (3 aftermarket sellers) | USD 30.80 to 31.78 | 6 Oct 2026 |
| Pacermarine | USD 49.51 | 6 Oct 2026 |
| Spare Part Mart | USD 18.22 | Today |
Our price of USD 18.22 is 20% to 63% less than these sellers.
Found this part cheaper somewhere else? Send us the listing and we will beat it by 5% under our Price Beat Guarantee. Every order is also covered by our 30 day money back guarantee.
No. It is an aftermarket part made to fit in place of Yanmar 128271-01911. It is not made by or affiliated with Yanmar; the Yanmar part number is used only to show what it replaces.
It fits Yanmar 2GM20, 2GM20F, 2GM20-YEU and 2GM20F-YEU marine diesel engines. Machines change parts between serial number ranges, so check the number on your old part or in your parts manual.
It is cut to the same bore, bolt and water passage pattern as the original. Clean both faces flat and dry, fit it without sealant unless the engine maker calls for it, and tighten the head bolts in the maker's sequence and torque.
Yes, we ship worldwide. Shipping is calculated at checkout, and every order is covered by our 30 day money back guarantee and price beat guarantee.
Prices depend on your postcode.
In USD for the quantity selected. The exact cost is confirmed at checkout.
