Gasket Set – Fits Yanmar 1GM10 Marine Diesel (Replaces 728171-92601)

$186.41 $298.00

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Product Details

This complete Gasket Set – Fits Yanmar 1GM10 Marine Diesel (Replaces 728171-92601) is designed for the Yanmar 1GM10 9HP 4-stroke marine diesel engine models manufactured between 1981–1996. It provides all the necessary seals and gaskets for a comprehensive engine overhaul.

This kit serves as a direct replacement for Yanmar part number 728171-92601, which supersedes 728171-92600, and is an aftermarket equivalent to Sierra 18-55501.

Installation: Intended for a complete engine rebuild or overhaul.
Fuel Type: Compatible with diesel engines.
Quality: Includes a variety of high-quality paper, rubber, and metal gaskets.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Brand	Part Number	Notes
Yanmar	728171-92601	Supersedes 728171-92600
Sierra	18-55501	Aftermarket cross-reference

Engine & Model Compatibility

Confirm your engine model/year in the table below.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.	Notes
Yanmar	1GM10	9	4-Stroke	1981–1996	728171-92601	Does not fit the older 1GM model.

Technical Specs

Product Type: Complete Gasket Set
Installation: Engine Rebuild/Overhaul
Fuel Type: Diesel
Housing Material: Various (Paper, Rubber, Metal)
Dimensions: 42.0" L x 29.0" W x 1.4" H
Warranty: Manufacturer Dependent (Typically 1 Year)
Other Attributes: High-Quality Aftermarket

What’s in the Box

Complete Gasket Set (Replaces 728171-92601)
1 x Gasket, Oil Sump (128170-01511)
1 x Gasket (128170-01751)
1 x O-Ring (128170-03070)
Additional gaskets and seals for a standard overhaul

Installation Notes

Disconnect the battery and completely drain all engine fluids, such as oil and coolant.
Carefully disassemble the engine, tagging and organizing all parts, bolts, and connections.
Thoroughly clean all mating surfaces to remove any trace of old gasket material, sealant, or corrosion.
Before installation, compare each new gasket with the old part to confirm an exact match.
Install gaskets on clean, dry surfaces unless the official service manual specifies a sealant.
Reassemble all components, following the manufacturer's specified torque sequences and values.
Refill engine fluids, reconnect the battery, and carefully inspect for any leaks before operation.

Troubleshooting & FAQ

Will this gasket set fit my Yanmar 1GM engine?

No, this set is specifically designed for the Yanmar 1GM10 model (1981–1996). It will not fit the older 1GM engine due to design differences.

Does this kit include every gasket for a full engine rebuild?

This is a comprehensive gasket set intended for a standard engine overhaul. While it includes the vast majority of required seals, always compare its contents with your service manual's requirements to ensure you have every part for your specific job.

Do I need to use sealant with these gaskets?

In most cases, no. These gaskets are designed to seal properly when installed on clean, dry surfaces. Only use gasket sealant or compound if it is explicitly recommended by the Yanmar service manual for a specific application area.

What are common signs of a failing engine gasket?

Look for external oil or coolant leaks, a noticeable loss of engine compression, white or blue smoke from the exhaust, or contaminated fluids (e.g., milky-looking oil, which indicates coolant mixing).

Is this an OEM or aftermarket part?

This listing is an aftermarket replacement (not OEM). It has been built to OEM-level specifications with comparable materials. The product is manufactured in an ISO 9002 facility and is batch-inspected for consistency.

What is the shipping speed and cost?

We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free, and expedited options will appear at checkout if they are available for your location.

What is the warranty and return policy?

This part is covered by a 1-year warranty against manufacturing defects under normal use. If any issues arise, please contact our support team with your order details. Returns are accepted within our standard window for items that are unused and 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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