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  1. D

    1996 7.4 Mercruiser 2 spark plug holes bridged over

    I was attempting to spray fogging oil into each cylinder, and the last 2 on the port side in the back the oil just dripped back out, and upon further investigation, there is a substance in each cylinder, and it is like semi solid, and in my photo, you can even see where the electrode of the...
  2. D

    1996 7.4 Mercruiser 2 spark plug holes bridged over

    I was winterizing my 7.4, and 2 of the 8 plugs had a sandy/powdery yellowish dry substance on them, it was the back last 2 plugs on the port side. When I looked in the holes, said substance is completely bridged over the holes, (where the spark plug electrodes protrude into the combustion...
  3. D

    1996 7.4 Mercruiser 2 spark plug holes bridged over

    I was winterizing my 7.4, and 2 of the 8 plugs had a sandy/powdery yellowish dry substance on them, it was the back last 2 plugs on the port side. When I looked in the holes, said substance is completely bridged over the holes. A few years back, I had a shady mechanic, who after doing a tune up...
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