Complete Engine Gasket Set – Fits Yanmar 2GM20/2GM20F (Replaces 728271-92605)
Complete Engine Gasket Set – Fits Yanmar 2GM20/2GM20F (Replaces 728271-92605) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Complete Engine Gasket Set – Fits Yanmar 2GM20/2GM20F (Replaces 728...
Product Details
This Complete Engine Gasket Set is engineered for Yanmar 2GM20 and 2GM20F marine diesel engines, providing all the necessary components for a comprehensive engine overhaul. It ensures a precise, leak-free fit to restore your engine to optimal running condition.
This kit serves as a direct replacement for Yanmar part number 728271-92605 and Sierra 18-55502.
- Designed for direct OEM-replacement installation.
- Compatible with marine diesel fuel systems.
- Includes a full set of gaskets and seals needed for a complete engine overhaul.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yanmar | 728271-92605 |
| Sierra | 18-55502 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Yanmar | 2GM20 | 18 | 4-Stroke | 728271-92605 | Marine diesel engine |
| Yanmar | 2GM20F | 18 | 4-Stroke | 728271-92605 | Marine diesel engine |
Technical Specs
- Product Type
- Complete Engine Gasket Set
- Installation
- OEM Replacement
- Fuel Type
- Diesel
- Housing Material
- Various (Paper, Metal, Composite)
- Other Technical Attributes
- Includes all gaskets and seals for engine overhaul
- Product Dimensions
- 25.0"L x 18.0"W x 1.8"H
What’s in the Box
- Complete set of gaskets and seals for cylinder head, manifolds, oil pan, valve cover, and other components required for an engine overhaul.
Installation Notes
- Disconnect the battery and safely drain all engine fluids (coolant and oil).
- Begin disassembling the engine systematically. Keep all parts and fasteners organized.
- Thoroughly clean all mating surfaces to remove old gasket material, sealant, and any corrosion.
- Carefully compare each new gasket with the corresponding old one to confirm correct shape and fit.
- Install the new gaskets and seals as specified by the engine service manual. Apply sealant only where instructed.
- Reassemble the engine components, ensuring all bolts are tightened to the manufacturer's specified torque sequence and values.
- Refill the engine with fresh fluids, reconnect the battery, and carefully check for any leaks before starting the engine.
Troubleshooting & FAQ
How do I know if this gasket set will fit my engine?
This gasket set is designed exclusively for Yanmar 2GM20 and 2GM20F marine diesel engines. Please confirm your engine model and cross-reference the OEM part number 728271-92605 before purchasing.
Does this kit include crankshaft seals?
This is a complete gasket set intended for a full overhaul, including gaskets for the cylinder head, manifolds, and covers. While it includes most necessary seals, you should verify against your service manual whether specific dynamic seals (like front or rear crankshaft seals) are included or must be purchased separately.
What are common symptoms of a failed head gasket?
Signs of a blown head gasket include milky or discolored engine oil, white smoke from the exhaust, persistent engine overheating, bubbling in the coolant reservoir, and external oil or coolant leaks from the cylinder head joint.
Should I use sealant with these gaskets?
Always refer to your Yanmar service manual. Many gaskets in modern kits are designed for dry installation. Using sealant where none is required can cause improper sealing and premature failure.
When should engine gaskets be replaced?
Gaskets do not have a regular service interval. They are replaced when they fail (causing leaks or performance issues) or as part of a scheduled engine overhaul or major repair.
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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