Gasket Kit – Fits Yanmar Marine 4JH4E/4JH4AE/4JH5E Diesel Engines (Replaces 729670-92600)

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Delivery and Shipping

Free standard shipping on all orders under 1 KG

If you have any questions, feel free to email us at info@sierramarines.com, and we’ll get back to you within 20–36 hours.

Product Details

This complete Gasket Kit – Fits Yanmar Marine 4JH4E/4JH4AE/4JH5E Diesel Engines, provides all necessary gaskets and seals for a full engine overhaul. It is engineered for all production years of the specified Yanmar 4JH series engines, ensuring a reliable, leak-free seal.

This kit serves as a direct replacement for Yanmar OEM part number 729670-92600.

Designed for direct, OEM-equivalent installation.
Includes a comprehensive set of seals for a complete engine rebuild.
Constructed from high-quality paper, metal, rubber, and composite materials for durability.

Part Number Matrix

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

Brand	Part Number
Yanmar	729670-92600

Engine & Model Compatibility

Confirm your engine model/year in the table below.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.	Notes
Yanmar	4JH4E	54 HP	4-Stroke	All	729670-92600	Marine Diesel Engine
Yanmar	4JH4AE	55 HP	4-Stroke	All	729670-92600	Marine Diesel Engine
Yanmar	4JH5E	53.5 HP	4-Stroke	All	729670-92600	Marine Diesel Engine

Technical Specs

Product Type: Complete Engine Gasket Kit
Installation: Direct OEM Replacement
Fuel Type: Diesel
Materials: Paper, Metal, Rubber, Composite
Product Dimensions: 43.0 cm L x 26.9 cm W x 0.4 cm H
Weight: 0.31 kg (0.68 lb)

What’s in the Box

1 x Complete Gasket Set (Replaces OEM Part #729670-92600)

Installation Notes

Disconnect the vessel'''s battery and allow the engine to cool completely before beginning work.
Drain all relevant fluids, such as engine oil and coolant, into appropriate containers.
Carefully disassemble the engine components required to access the old gaskets. Organize all parts and fasteners.
Thoroughly clean all mating surfaces, ensuring they are free of any old gasket material, oil, or debris.
Compare the new gaskets with the old ones to confirm correct fitment before installation.
Install the new gaskets following the procedures and torque sequences outlined in your engine'''s official service manual.
Reassemble all components, tightening fasteners to the manufacturer'''s specified torque values.
Refill the engine with fresh fluids, reconnect the battery, and carefully inspect for leaks after starting the engine.

Troubleshooting & FAQ

How do I know if this gasket kit will fit my engine?

This kit is specifically designed for Yanmar Marine 4JH4E, 4JH4AE, and 4JH5E series diesel engines. To ensure compatibility, please verify your engine model against the list provided on this page. This kit is an aftermarket replacement for OEM part 729670-92600.

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

This is a complete gasket overhaul kit containing the standard seals needed for a comprehensive rebuild. However, we recommend cross-referencing the contents with your engine'''s service manual to ensure all specific needs for your project are met.

What are the signs of a failing engine gasket?

Common symptoms of gasket failure include external oil or coolant leaks, engine overheating, loss of compression, or milky-white residue in the engine oil, which can indicate a blown head gasket.

Is any sealant required when installing these gaskets?

Some gaskets in this kit are designed to be installed dry, while others may require an appropriate sealant. Always refer to your official Yanmar service manual for specific instructions on sealant use for each gasket location.

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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