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  1. H

    Cause of Engine Alarm

    "I have a 1999 7.4L with Bravo "I have a 1999 7.4L with Bravo 3 outdrive. When I plane the boat0about 3500 RPM, my engine alarm goes off. Water temperature is fine, oil pressure is fine, gear oil reservoir is full. If I stay slow, less than 2500 RPM, the alarm never goes off. I've pulled each...
  2. H

    Engine Alarm

    "I have a 99 7.4L with Bravo 3 "I have a 99 7.4L with Bravo 3 outdrive. when I plane the boat, my engine alarm goes off. Water temperature is fine, oil pressure is fine, gear oil reservoir is full. If I stay slow, less than 2500 RPM, the alarm never goes off. I've pulled each sensor wire and...
  3. H

    Spark plug seized and getting round

    Spark plug broke off. Can get Spark plug broke off. Can get socket in after using penetrating oil but the plug is getting roounded and I can't get torque. What now? Will an easy out work?
  4. H

    Broken Spark Plug amp I canbt get it out

    "Mercruiser 7.4 MPI IO, boat w "Mercruiser 7.4 MPI IO, boat was in salt water for a long time, though on a lift when not in use. While chagning plugs, one broke off and I can't get the spark plug socket in far enough to get a grip on the plug. The base of the plug and surrounging opening are...
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    Spark Plugs for 74 MPI

    I have a 1999 7.4 MPI Mercruis I have a 1999 7.4 MPI Mercruiser IO. The SELOC manual states I should use NGK BPR6EFS spark plugs. The plug I pulled out was an AC MR43LTS. The replacement plug I was planning to use is a Champion RV12YC. The difference in these plugs is the reach - .406 vs. .708...
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