Evinrude / Johnson Outboard Head Gasket

The Evinrude / Johnson Outboard Head Gasket 330818 is a critical engine seal designed for 9.9 HP to 15 HP outboard motors. It is compatible with twin-cylinder models manufactured between 1974 and 1992. 

Product Specifications & Compatibility

• OEM Part Numbers: 0330818, 330818.
• Aftermarket Alternatives:
• Sierra Marine: Part number 18-2963 is a common aftermarket replacement.
• Mallory: Part number 9-63832.
• GLM: Part number 34140.
• Engine Range: Fits 9.9 HP, 10 HP Commercial, 14 HP, and 15 HP models. 

Signs You Need a Replacement

Common symptoms of a blown head gasket on these motors include:

• Overheating: Frequent temperature spikes during operation.
• Water Contamination: Water appearing on the spark plugs or a "milky" buildup in the cylinders.
• Loss of Power: A drop in compression (e.g., from 130 PSI to 90 PSI) causing the engine to misfire or run poorly.

This product is the best replacement for the following: BRP320533, BRP318914, BRP330818, 745419007676, 320533, 330818, 318914

Outboard Head Gasket

This product replaces:

BRP320533, BRP318914, BRP330818, 745419007676, 320533, 330818, 318914