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Thermostat Kit 18-3677 3856961 for Volvo Penta OMC Cobra 4.3 5.0 5.7 5.8 V6 V8 Engine
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FridayParts Thermostat Kit

Thermostat Kit 18-3677 3856961 for Volvo Penta OMC Cobra 4.3 5.0 5.7 5.8 V6 V8 Engine

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Product Details

Thermostat Kit 18-3677 3856961 for Volvo Penta OMC Cobra 4.3 5.0 5.7 5.8 V6 V8 Engine

Replacement Part Number: 18-3677, 183677, 3856961

Fit For Volvo Penta Engine: 4.3GL, 4.3GS, 4.3Gi, 5.0FL, 5.0Fi, 5.7GL, 5.7Gi, 5.8FL, 5.8Fi, 5.8FSi
Fit For OMC Cobra Engine: 4.3L, 4.3HO, 5.0L, 5.8L, 5.8EFI

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Brand: FridayParts
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Terry Stoner
Reviewed on 31/07/2025
Fixed My Overheating Issues Fast!

My boat was running a little too hot for comfort—swapped in this thermostat kit and boom, problem solved. Everything fit like a glove on my 5.7 V8. Took it out for a weekend ride and temp stayed solid the whole time. Super easy install and great quality parts. Would buy again in a heartbeat.

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