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  1. R

    Odd 4.3 overheating

    I did use sealant on gasket from housing to motor and correct I did the cork gasket first then the thermostat then the retaining sleeve. I will say when thermostat is in I couldn’t touch the housing it was so hot but I will try the temp gun to give it a double check.
  2. R

    Odd 4.3 overheating

    Update: Removed the thermostat now not overheating. Tested thermostat in boiling water with thermometer seems to open as designed. Any ideas?
  3. R

    Odd 4.3 overheating

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  4. R

    Odd 4.3 overheating

    Pump https://www.partsvu.com/water-pump-assy-46-8m6005225.html
  5. R

    Odd 4.3 overheating

    Engine serial number is unknown the tag is worn out Thermostat housing- (Mercury Thermostat Housing - Fits MCM/MIE 4.3L, 5.0L, 5.7L Carbureted Engines w/ Dry Joint Exhaust - 864592T SKU: 864592T) to be specific See below The T for the check ball screws in the top of the housing...
  6. R

    Odd 4.3 overheating

    Correct. but the hot riser issue went away.
  7. R

    Odd 4.3 overheating

    Hello All, I am having a overheating problem with my 06 mercruiser 4.3 Last season I was having a issue with the starboard riser running hot but the engine seem to run normal around 160. I replaced the starboard manifold thinking that was it. It was not I found the check ball was the issue I...
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