YAMAHA UPPER ENGINE BASE GASKET 6J8-45113-A0

Function and technical context

The engine base gasket is a critical sealing component that sits between the cylinder head and engine block on Yamaha outboard engines. This piece acts as a watertight barrier that prevents the entry of salt water and contaminants into the internal chambers of the engine, protecting the lubrication and cooling systems. Failure of this gasket compromises the integrity of the engine seal, allowing leaks that degrade the oil, corrode internal components and can cause general overheating. Its correct operation is essential for the durability and performance of the marine thruster.

When to replace this part?

The engine base gaskets show symptoms of aging such as visible oil leaks around the mounting area, progressive loss of lubrication pressure indicated on the pressure gauge, or water entering the crankcase detectable by oil emulsion (milky appearance). It is advisable to inspect the condition of this gasket during each seasonal maintenance and replace it preventively every two or three seasons of intense use, or immediately if leaks are detected. Changing the gasket preventively avoids costly breakdowns resulting from engine oil contamination in deep water or long voyages.

Motores Yamaha Compatibles▾

Modelo	Años
25J	1987 – 1999
30D	1986 – 2016
30D 2-Stroke, 3	2007
30DM	2010 – 2012

Equivalent manufacturer part numbers