Front Seal Cover Gasket – Fits Yanmar 2GM, 3GM Series (Replaces 121575-01510)
Front Seal Cover Gasket – Fits Yanmar 2GM, 3GM Series (Replaces 121575-01510) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Free standard shipping on all orders under 1 KG
Front Seal Cover Gasket – Fits Yanmar 2GM, 3GM Series (Replaces 121...
Product Details
This Front Seal Cover Gasket – Fits Yanmar 2GM, 3GM Series ensures a reliable seal for the gear case on various Yanmar marine engines. It is commonly installed in sailboats and other small watercraft equipped with 2GM and 3GM series diesel engines, preventing oil and coolant leaks.
This part is a direct replacement for Yanmar OEM part numbers 121575-01510 and 121575-01512.
- Designed for direct, hassle-free installation.
- Seals the front gear case and timing cover assembly.
- Engineered for use in diesel marine environments.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yanmar | 121575-01510 |
| Yanmar | 121575-01512 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This gasket fits a wide range of Yanmar 2GM and 3GM series marine diesel engines.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Yanmar | 2GM | 4-Stroke | 121575-01510 | ||
| Yanmar | 2GMZ | 4-Stroke | 121575-01510 | ||
| Yanmar | 2GM20 | 18 | 4-Stroke | 121575-01510 | |
| Yanmar | 2GM20B | 18 | 4-Stroke | 121575-01510 | |
| Yanmar | 2GM20C | 18 | 4-Stroke | 121575-01510 | |
| Yanmar | 2GM20F | 18 | 4-Stroke | 121575-01510 | |
| Yanmar | 2GMLP | 4-Stroke | 121575-01512 | Alternative part number | |
| Yanmar | 2GMLP-C | 4-Stroke | 121575-01512 | Alternative part number | |
| Yanmar | 2GMSZK | 4-Stroke | 121575-01512 | Alternative part number | |
| Yanmar | 2GM20VE | 18 | 4-Stroke | 121575-01510 | |
| Yanmar | 3GM | 4-Stroke | 121575-01510 | ||
| Yanmar | 3GM(F) | 4-Stroke | 121575-01510 | ||
| Yanmar | 3GM30 | 27 | 4-Stroke | 121575-01510 | |
| Yanmar | 3GM30B | 27 | 4-Stroke | 121575-01510 | |
| Yanmar | 3GM30C | 27 | 4-Stroke | 121575-01510 | |
| Yanmar | 3GM30F | 27 | 4-Stroke | 121575-01510 | |
| Yanmar | 3HM | 4-Stroke | 121575-01510 | ||
| Yanmar | 3HMF | 4-Stroke | 121575-01510 | ||
| Yanmar | 3HM35 | 4-Stroke | 121575-01510 | ||
| Yanmar | 3HM35C | 4-Stroke | 121575-01510 | ||
| Yanmar | 3GMLE | 4-Stroke | 121575-01510 | ||
| Yanmar | 3GMFY-E | 4-Stroke | 121575-01510 |
Technical Specs
- Product Type
- Gear Case Gasket / Front Seal Cover Gasket
- Installation
- Direct replacement
- Fuel Type
- Diesel
- Dimensions
- 36.0 cm L x 25.0 cm W x 0.2 cm H
- Warranty
- 6 months (OEM replacement)
- Other Technical Attributes
- Seals the front gear case/timing cover
What’s in the Box
- 1 x Gear Case Gasket / Front Seal Cover Gasket (121575-01510)
Installation Notes
- Ensure the engine is off and cool, then disconnect the battery terminals.
- Drain engine coolant and/or oil as needed to prevent spills when the cover is removed.
- Carefully remove any interfering components to access and unbolt the front gear case/timing cover.
- Remove the old gasket completely. Thoroughly clean both the engine block and cover mating surfaces to remove all old gasket material and residue.
- Position the new gasket, making sure it aligns perfectly with all bolt holes and passages.
- Reattach the front cover, tightening the bolts in the sequence and to the torque values specified in your engine's service manual.
- Refill the engine with coolant and/or oil. Before starting, double-check for any leaks.
Troubleshooting & FAQ
How do I know if this gasket will fit my Yanmar engine?
Please refer to the "Engine & Model Compatibility" table on this page. This gasket is designed for a wide range of Yanmar 2GM and 3GM series engines. Cross-reference your specific engine model to ensure a perfect match.
What are the signs of a failing front seal cover gasket?
The most common symptoms are visible oil or coolant leaks from the front section of the engine, specifically around the seam of the timing or gear case cover. You may also notice a gradual drop in oil or coolant levels.
What is the difference between part numbers 121575-01510 and 121575-01512?
Both are official Yanmar part numbers for this gasket. They are functionally identical and serve as direct replacements for each other, though one may be specified for certain engine sub-models or production years. Both are covered by our compatibility list.
Do I need to use sealant with this gasket?
This type of gasket is generally designed for a dry installation. However, we always recommend consulting your engine's official service manual, as some specific applications might call for a small amount of sealant in certain areas.
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.
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