Oil Pump Gasket – Fits Yanmar 2GM, 3GM Series Marine Engines (Replaces 121450-32021)
Oil Pump Gasket – Fits Yanmar 2GM, 3GM Series Marine Engines (Replaces 121450-32021) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
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Oil Pump Gasket – Fits Yanmar 2GM, 3GM Series Marine Engines (Repla...
Product Details
This high-quality Oil Pump Gasket – Fits Yanmar 2GM, 3GM Series Marine Engines creates a secure seal between the oil pump and the engine block. It is designed for a precise fit on a wide range of Yanmar marine diesel engines, including the 1GM, 2GM, and 3GM series, to prevent oil leaks and maintain essential oil pressure for optimal engine performance.
This part is a direct replacement for Yanmar OEM part number 121450-32021.
- Installs directly between the oil pump and engine block.
- Engineered for use in diesel marine environments.
- Prevents oil leakage and pressure loss from the oil pump assembly.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yanmar | 121450-32021 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This gasket fits a broad range of Yanmar GM series marine engines. It is also found in several cross-application Yanmar tractors, but verification for marine use is recommended.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Yanmar | 1GM10 | 9 | 4-Stroke | 121450-32021 | |
| Yanmar | 2GM | 4-Stroke | 121450-32021 | ||
| Yanmar | 2GM20, 2GM20F | 20 | 4-Stroke | 121450-32021 | |
| Yanmar | 2GM20-YEU, 2GM20F-YEU | 20 | 4-Stroke | 121450-32021 | |
| Yanmar | 2GMF | 4-Stroke | 121450-32021 | ||
| Yanmar | 2GM20C-YEU | 20 | 4-Stroke | 121450-32021 | |
| Yanmar | 2GM20FVE | 20 | 4-Stroke | 121450-32021 | |
| Yanmar | 3GM | 4-Stroke | 121450-32021 | ||
| Yanmar | 3GM30, 3GM30F | 30 | 4-Stroke | 121450-32021 | |
| Yanmar | 3GM30-YEU, 3GM30F-YEU | 30 | 4-Stroke | 121450-32021 | |
| Yanmar | 3GM30FVE | 30 | 4-Stroke | 121450-32021 | |
| Yanmar | 3GMD | 4-Stroke | 121450-32021 | ||
| Yanmar | 3GMF | 4-Stroke | 121450-32021 | ||
| Yanmar | 3GMLE | 4-Stroke | 121450-32021 | ||
| Yanmar | 3GM30VE | 30 | 4-Stroke | 121450-32021 | |
| Yanmar | YM140, YM147, YM169, YM180, YM186, YM187, YM220, YM226, YM250, YM276 | 4-Stroke | 121450-32021 | Tractor application | |
| Yanmar | YM1401, YM1502, YM1510, YM1601, YM1602, YM1610, YM1702 | 4-Stroke | 121450-32021 | Tractor application | |
| Yanmar | YM1720D, YM1802, YM1810, YM1820, YM2001, YM2002, YM2010, YM2020 | 4-Stroke | 121450-32021 | Tractor application | |
| Yanmar | YM2202, YM2301, YM2310, YM2310D, YM2402, YM2420, YMG1800, YMG2000 | 4-Stroke | 121450-32021 | Tractor application |
Technical Specs
- Product Type
- Oil Pump Gasket
- Installation
- Direct fit between oil pump and engine block
- Fuel Type
- Diesel
- Material
- Gasket material (composite)
- Dimensions
- 9.5" × 7.5" × 0.1"
- Application
- Seals oil pump to engine block to prevent leaks and maintain oil pressure
- OEM Reference
- Yanmar Marine part 121450-32021
What’s in the Box
- 1 x Oil Pump Gasket (121450-32021)
Installation Notes
- Disconnect the vessel's battery and ensure the engine is cool.
- Position a drain pan under the engine and drain the engine oil completely.
- Carefully remove any components obstructing access to the oil pump.
- Unbolt and remove the oil pump from the engine block.
- Thoroughly clean the mating surfaces of both the engine block and the oil pump, removing all traces of the old gasket and any sealant.
- Position the new gasket onto the engine block, aligning it with the bolt holes.
- Reinstall the oil pump, ensuring it is seated correctly against the new gasket.
- Tighten the pump mounting bolts to the manufacturer's specified torque in the correct sequence.
- Refill the engine with the correct grade and quantity of oil.
- Reconnect the battery, start the engine, and carefully inspect the oil pump area for any signs of leaks.
Troubleshooting & FAQ
How do I know if this gasket will fit my Yanmar engine?
The best method is to confirm your engine model is listed in the compatibility table. Also, compare the OEM part number 121450-32021 with the number listed in your engine's service manual or stamped on your old part.
What are the signs of a failing oil pump gasket?
Common symptoms include visible oil leaks around the oil pump mounting area, a gradual drop in oil level without obvious cause, or low oil pressure warnings on your dashboard. An oily bilge may also indicate a leak.
Is this gasket a direct replacement for the original Yanmar part?
Yes, it is designed to be a direct-fit replacement for Yanmar part number 121450-32021, matching the original in form, fit, and function for a reliable seal.
How often should the oil pump gasket be replaced?
There is no fixed replacement interval. This gasket should be replaced whenever the oil pump is removed for service or if it develops a leak.
Can I reuse my old oil pump gasket?
No. Gaskets are single-use components that compress to create a seal. Reusing an old gasket will almost certainly result in leaks and improper sealing.
Can this part be used in a Yanmar tractor engine?
While this gasket is known to fit many Yanmar tractor models as a cross-reference part, our primary focus and testing are for marine applications. Please verify fitment for your specific tractor model independently.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns?
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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