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  1. 3

    3.0 engine coupler smoked today

    Trans still shifts ok but the splines spun inside the rubber. It happened on a hole shot and when i walked back to look at the out drive i noticed the ski strap had come loose from one side of the boat. Is it possible it wrapped around the prop and caused the splines in the coupler to shear...
  2. 3

    Pertronix ignition problem

    After 2 trips around the lake today at idle my mercruiser 140 would die and not want to start. I checked the carb first and it was getting good squirts of gas but no fire. I pulled a plug and grounded it while my wife cranked the engine and no spark. After sitting about 10 minutes it would...
  3. 3

    Mercruiser 140 idle RPM out of gear?

    I have found the idle rpm's in gear on the tune-up chart. Is the out of gear idle rpm's the same? I am trying to find out whats safe for the gears RPM wise for shifting into gear.
  4. 3

    Mercruiser 140 over heating

    I just got my 140 running after a rebuild and it will over heat if left at idle for too long. If i bring the RPMs up to 1200 it cools back down. I pulled the lower end off of the out drive last night and the impeller is in pretty bad shape. My question is, even with the garden hose hooked up...
  5. 3

    Mercruiser 140 manifold question.

    I am replacing my 120 with a 140 and was wanting to use the manifold from the 120 because it's good with no cracks. I just got it off and the ports are much smaller on the manifold then the intake and exhuast ports in the head. I'm thinking this is going to hurt the performance of the 140...
  6. 3

    Mercruiser 140 ID

    I bought a used Mercruiser 140 and the S/N tag is missing. Can i ID the build date of this engine by the numbers stamped in the pad by the distributor or the casting numbers on the side of the block? Unlike my other 140 with the recessed D shape in the top's of the pistons this one has flat...
  7. 3

    Mercruiser 3.0 water in oil

    I bought a boat with engine today just for the 3.0 Mercruiser. The guy said it had over heated last year but that he had a head gasket put on and then used the boat about 5 or 6 times with no more over heating. I put a carb on it when i got home and hooked water to the lower out put. I had...
  8. 3

    3.0 question

    I bought a 1978 18' Marquis Stingray with the understanding the block was cracked and it is. It has a 120 Mercruiser in it and another boat i am thinking about buying has an engine that says OMC 3.0 with a mercruiser sterndrive. Is there any reason the OMC 3.0 with mercruiser sterndrive would...
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