Head Gasket and Water Jacket Gasket Set – Fits Johnson/Evinrude V4 88-140HP (Replaces 318358, 318335)
Head Gasket and Water Jacket Gasket Set – Fits Johnson/Evinrude V4 88-140HP (Replaces 318358, 318335) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Head Gasket and Water Jacket Gasket Set – Fits Johnson/Evinrude V4 ...
Product Details
This UanofCn Head Gasket and Water Jacket Gasket Set is designed for Johnson and Evinrude 85-140HP V4 outboard engines manufactured between 1973 and 1995, primarily fitting 90° V4 Crossflow models. It provides a reliable seal for the engine's cylinder head and water jacket cover.
The set serves as a direct replacement for Johnson/Evinrude parts 318358 (Head Gasket) and 318335 (Cover Gasket), and also interchanges with Sierra 18-2956, 18-2873-9; GLM 33540, 33530; and Mallory 9-63828, 9-60454.
- Engineered for direct-fit installation.
- Constructed from durable non-asbestos material with a metal skeleton for enhanced strength.
- Includes two essential gaskets for a complete V4 head service.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Johnson/Evinrude | 318358 |
| Johnson/Evinrude | 318335 |
| Sierra | 18-2956 |
| Sierra | 18-2873-9 |
| GLM | 33540 |
| GLM | 33530 |
| Mallory | 9-63828 |
| Mallory | 9-60454 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Johnson/Evinrude | V4 | 65 JET | 1991–1995 | 318358, 318335 | |
| Johnson/Evinrude | V4 | 80 JET | 1991–1996 | 318358, 318335 | |
| Johnson/Evinrude | V4 | 85 | 1979–1980, 1991–1995 | 318358, 318335 | |
| Johnson/Evinrude | V4 | 88 | 1987–1995 | 318358, 318335 | |
| Johnson/Evinrude | V4 | 90 | 1981–1995 | 318358, 318335 | |
| Johnson/Evinrude | V4 | 100 | 1979–1995 | 318358, 318335 | Includes Commercial models |
| Johnson/Evinrude | V4 | 110 | 1986–1989 | 318358, 318335 | |
| Johnson/Evinrude | V4 | 115 | 1973–1995 | 318358, 318335 | |
| Johnson/Evinrude | V4 | 135 | 1973–1976 | 318358, 318335 | |
| Johnson/Evinrude | V4 | 140 | 1977–1984 | 318358, 318335 | |
| Johnson/Evinrude | V4 | 1.6L | 1983–1990 | 318358, 318335 | 1600CC (1988) |
| OMC Stern Drive | V4 | 90 | 318335 | Cover gasket only |
Technical Specs
- Product Type
- Head and Cover Gasket Set
- Installation
- Direct replacement
- Material
- Non-asbestos Gasket with Metal Skeleton
- Housing Color
- Black
- Dimensions
- 28.5" L x 18.5" W x 1.5" H
- Manufacturer
- UA-OFN Marine Parts R&D Manufacturer
- UPC
- 788934575329
What’s in the Box
- 1 x Head Gasket (Replaces 318358)
- 1 x Water Jacket Cover Gasket (Replaces 318335)
Installation Notes
- Disconnect the battery and drain the engine's cooling system completely.
- Carefully remove the cylinder head cover and any interfering components.
- Loosen and remove the cylinder head bolts in the reverse order specified by the manufacturer's service manual to prevent head warping.
- Remove the old head gasket and water jacket gasket. Thoroughly clean all mating surfaces on the engine block and cylinder head, ensuring they are free of old gasket material, oil, and debris.
- Position the new head gasket and water jacket gasket correctly. Do not use sealant unless specifically required by your service manual.
- Reinstall the cylinder head and torque the bolts in the correct sequence and to the specified values. This is critical for a proper seal.
- Reassemble all remaining components, refill the cooling system, and reconnect the battery.
- Start the engine and check for any leaks around the cylinder head and cover.
Troubleshooting & FAQ
How do I know if this is the right gasket set for my engine?
Verify your engine's model, horsepower, and year against the compatibility table. It is also essential to cross-reference the OEM part numbers (318358, 318335) listed in your service manual with those provided in the product description.
What are the signs of a failed head gasket?
Common symptoms include engine overheating, loss of power or compression, water in the engine oil (milky appearance), or white smoke from the exhaust. A visual inspection may also reveal water or oil leaks from the cylinder head area.
What is the difference between the head gasket and the water jacket gasket?
The head gasket (318358) seals the combustion chamber between the cylinder head and the engine block. The water jacket cover gasket (318335) seals the cover that encloses the cooling passages around the cylinders, preventing external water leaks.
Is any sealant required during installation?
These gaskets are typically designed to be installed dry. Applying sealants can interfere with the gasket's ability to seal properly. Always follow the specific instructions in your engine's official service manual.
How often should these gaskets be replaced?
Head gaskets are not a regular maintenance item. They are typically replaced only when the cylinder head is removed for other service or if the gasket has failed.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility and batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free; expedited options will appear at checkout where available.
Warranty & returns
This product is covered by a 1-year warranty against manufacturing defects under normal use. If any issues arise, contact our support team with your order details. Returns are accepted within our standard window, provided the item is unused and in its original condition. Please see our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against 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 quality control.
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