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  1. C

    Poppet Valve 83 150 Black Max

    My Engine when first starts out has higher water pressure & runs alittle hot untill the first time the throttle is opened up..Then the water presure drops to about 7/9 psi & engine temp cools down. Usually it is good for the rest of the trip..The Poppet Valve is New & Clean the spring is good...
  2. C

    Carbon Cleaning/Compression

    I have an 83 150hp V 6 Merc..It has not been run very much in the last few years..It Starts easy, runs smooth and is capable of 5500 WOT..I checked compression just to get an idea whats going on inside..I found 5 of the cylinders with in 5psi of each other. 1 was 15psi low,port side lowest...
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    Overheating 83 150 merc v6

    I recently got a 83 150 v6 merc with an overheating issue. I replaced the water pump, missing thermostats & new poppet valve. Temp guage reads 170 180 on the hose.Water out the pee hole is hot,water out the prop is only warm..Water psi is 4-5 at idle,9 10 at fast idle..I also removed heads to...
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