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  1. N

    3.0 Mercruiser Dies On Acceleration

    1992 3.0 Mercruiser will start fine. Idle is at 750 rpm at idle at 2 turns in on the idle screw. And at 1 1/4 turn out on the mix screw the vacuum is only 5inches. I should be idling forward to check rpm and vacuum but I cant stay in forward without the boat dying. In this condition, the...
  2. N

    No Start, but should

    3.0 Mercruiser fresh rebuild. Compression around 200 psi in all clyinders, spark at every spark plug, timing set to 1 degree BTDC like the cover says, carb is new and properly squirting fuel, battery full and new starter. When I crank it the engine cranks strong and then after 2 seconds it sound...
  3. N

    Oil coming from exhaust riser rubber coupling

    I was testing a new carburetor on the lake. Couldn't go over 2500 rpm WOT and definitely wouldn't plane. After 10 minutes the engine bay was full of blue smoke and oil was spraying out of the exhaust riser rubber coupling. Where do I start? Extra details: engine timed, new spark plugs and fuel...
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