Mercruiser Thermostat Kit GM

Thermostat kit Mercruiser GM

Thermostat kit to fit GM based MerCruiser engines from 1987 onwards . The thermostat is designed for use in cooling systems with constant circulation and has an opening temperature of 160°F (71°C) . The kit includes all necessary gaskets for thermostat replacement.

The thermostat is an important part of the engine's cooling system. It regulates the engine's operating temperature . A faulty thermostat can cause the engine to overcool or overheat . In the worst case, the engine can boil, but running too cold is also not good, as it increases wear and fuel consumption .

Make sure the thermostat opens and closes at the correct temperature. You can test your current thermostat by heating it in water and checking to see if it opens at the correct temperature. If you are unsure about the thermostat's operation, it is a good idea to replace it .

OEM: 807252T5
Previous OEM numbers: 807252Q5, 8M0109441, 807252T8

Fits the following engines (according to serial number)

3.0L

• 3.0L GM 181 I/L4 > 1A002000 – 1A020543

• 3.0L GM 181 I/L4 > 1A020544 & up

• 3.0L MPI EC > 1A072812 & up

• 3.0L Crate Engine > 1G800000 – 1G899999

4.3L

• 4.3L CARB ALPHA/BRAVO > 0M615000 – 0W300012

• 4.3L CARB ALPHA/BRAVO > 0W300013 – 0W309999

• 4.3L CARB ALPHA/BRAVO > 0W310000 – 0W649999

• 4.3L CARB ALPHA/BRAVO > 0W650000 – 1A063239

• 4.3L CARB ALPHA/BRAVO > 1A063240 & up

• 4.3L MPI ALPHA/BRAVO > 0M615000 – 0W309999

• 4.3L MPI ALPHA/BRAVO > 0W310000 – 0W649999

• 4.3L MPI ALPHA/BRAVO > 0W650000 – 0W658582

• 4.3L MPI ALPHA/BRAVO > 0W658583 – 0W658583

• 4.3L MPI ALPHA/BRAVO > 0W658584 – 1A030367

• 4.3L MPI ALPHA/BRAVO > 1A030368 – 1A030369

• 4.3L MPI ALPHA/BRAVO > 1A030370 – 1A063239

• 4.3L MPI ALPHA/BRAVO > 1A063240 & up

• 4.3L Alpha 4V EST > 1G417302 – 1G499999

5.0L

• 5.0L MPI ALPHA/BRAVO EC > 1A300000 – 1A611927

• 5.0L MPI ALPHA/BRAVO > 1A611928 – 1A623184

• 5.0L MPI ALPHA/BRAVO EC > 1A611928 – 1A623184

• 5.0L MPI ALPHA/BRAVO > 1A623185 & up

• 5.0L MPI ALPHA/BRAVO EC > 1A623185 & up

350 CID (5.7L)

• 350 MPI ALPHA > 1G400000 – 1G499999

• 350 MPI BRAVO > 1G400000 – 1G499999

• 350 MPI Alpha/Bravo > 1G700000 – 1G799999

• 350 MAG MPI HORIZON ALPHA/BRAVO EC > 1A300000 – 1A611927

• 350 MAG MPI ALPHA/BRAVO EC > 1A300000 – 1A611927

• 350 MAG MPI ALPHA/BRAVO > 1A611928 – 1A623184

• 350 MAG MPI HORIZON ALPHA/BRAVO EC > 1A611928 – 1A623184

• 350 MAG MPI ALPHA/BRAVO EC > 1A611928 – 1A623184

• 350 MAG MPI ALPHA/BRAVO > 1A623185 & up

• 350 MAG MPI HORIZON ALPHA/BRAVO EC > 1A623185 & up

• 350 MAG MPI ALPHA/BRAVO EC > 1A623185 & up

377 CID (6.2L)

• 377 MAG MPI BRAVO EC > 1A343300 – 1A611927

• 377 MAG MPI BRAVO > 1A611928 – 1A623184

• 377 MAG MPI BRAVO EC > 1A611928 – 1A623184

• 377 MAG MPI BRAVO > 1A623185 & up

• 377 MAG MPI BRAVO EC > 1A623185 & up

383 CID (6.3L)

• 383 MAG STROKER BRAVO > 1G400000 – 1G499999