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1328 Review
56 Karma

Review on 🌊 Marine Thermostat Kit Sierra 18-3647D by Carlos Long

Revainrating 1 out of 5

The only washer that worked for my application was the .

The only gasket that worked for my application was a riveted gasket, very specialized. Once the gasket material got wet, it basically dissolved and flew out from under the thermostat housing under pressure. A serious mistake, as a result of which the hold quickly filled with water without my knowledge. Try to find an OEM Mercruiser kit

Pros
  • Fits 1987 to present GM engines with standard cooling requiring a 160 degree thermostat.
Cons
  • So far so good