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  1. M

    Piston Rings Gap 3.0 Mercruiser

    I am rebuilding my engine and I got a new set of pistons (two off the old one had pieces broken) I had a set of STD rings (new) and the gap was 0.041 (biggest) I know on the manual the gap must be 0.010 to 0.020, so I order 030 oversize rings My questions is: Should I keep the gap 0.011 with...
  2. M

    Mercruiser 3.0 knock video

    Everything starter with a bad manifold and riser but the hole was very small so I could start and run for 20 minutes and them start to run rough and died.That was when the knock started Sounds like it is from the bottom Please guys help to figure this out what is making it Here is the link...
  3. M

    Head Gasket is out, what is next??

    I decided to do a head gasket swap on my 1986 mercruiser 3.0 and this is what I found..... * the pistons walls are good no scratches * two valves it is not sitting good * the head gasket is stainless * the push rod aren't bent * every valve has a tan color except the ones are not sitting right...
  4. M

    Could the advance timing get stuck?

    3.0 mercruiser 1986 after hit WOT for few minutes the engine idle rough and dies, I looked under the Ignitor cap, the springs looks little rusty. What is cleaning procedure on that? Replace? Thanks
  5. M

    Is Electronic Ignitor goes bad?

    I bought this boat and came with electronic ignitor, I am having problems with idle after run wot for 5 min. runs rough and dies Wait ten minutes and starts right up runs a little in idle and dies I have one spark tester bulb, I don't see spark after the distribution Rebuild the Carb last...
  6. M

    Water in exhaust (wrong place)

    Today I put in water to figure this out. So, like always, run nice for 45 min and starts to run rough and dies . I got the spark plug for the piston #4 and had water in it :eek:. All the others was fine. Back home removed the oil no water :) Removed the exhaust elbow and had water inside the...
  7. M

    Gimbal Housing Repair???

    I took my driver out to replace the bellows and part of the gimbal housing was corroded, is it a way to repair this. I tried to mig weld with aluminum but would not stick to it, so I am looking for a different solution (epoxy, resin, repair kit, ....) My engine is 1986 3.0 mercruiser alpha 1...
  8. M

    Alpha 1 no reverse

    Hi everybody, I am new on the forum I have a 1986 mercruiser 3 .0l alpha 1 I did the impeller and pump on my lower unit (alpha one 1st gen) and I did the process (remove with shifter FW and put back holding the prop CCW ... ) So , after all done, the reverse didn't work , so I lower the...
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