Sierra 18-0389 MerCruiser Heat Exchanger End Gasket
- Brand:
- Sierra
- Part no:
- 18-0389
Image: Wholesale Marine
Where to buy
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This is a Sierra end gasket for the heat exchanger on MerCruiser stern drive engines. It is sold under part number 18-0389. It is listed for a 3.7L engine with a 4 inch heat exchanger, so check your exchanger size before you pull the old gasket. The application list covers MerCruiser stern drive models from the early 1980s through 1989, matched by serial number ranges.
Our take
The fit note is specific: a 3.7L engine with a 4 inch heat exchanger. That means the exchanger size is the first thing to measure before you buy, since this gasket is not described as a general fit for other exchangers.