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  1. T

    Compression and water/coolant in cylinder

    Long story short I was replacing spark plugs and found coolant in cylinder #1 from when I winterized it. Mercruiser 454 (L621109) raw water cooled. Compression in that cylinder after cleaning it out is excessive I believe. Between 200 and 225psi. The next cylinder #3 is only Between 50 and...
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