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  1. S

    1991 4.3 mercruiser engine exhaust manifolds

    Thinking I drained all the water out of the system it appears not so, draine the block , and took off some hoses, did not drain the exhaust manifolds,thinking gravity would do the rest. After sitting for a year and thru winter , went to start up and was hard startingag poured some gas down the...
  2. S

    alpha 1 stern drive trim sensors

    Replaced the trim sensor , and limit switch , sensor is set o.k , but cant get the trim limit to work right. I set the drive all the way down , trim up to 21 3/4 inch, set sensor screws, trim down to bottom position, but it wont come bake up, using trailer switch will go up , at a certain point...
  3. S

    water impeller gaskets

    Have a mercruiser alpha 1 stern drive , year 1991 , replaced the seawater pump last year , took it apart recently to check the impeller, all looks good , gaskets to , do I need replace the gaskets if they seem fine?
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    exhaust riser gaskets

    HI all, Last year I overheated the engine on my 4.3 l mercruiser, rebuilt the water impeller pump last fall,took it out this summer and all seemed well untill going high speed for awhile and the alarm sounded indicating overheating again, then the ignition fuse went,ive been reading about high...
  5. S

    sterndrive pressure test

    Hi all, just replaced the intake impeller and seals , installed the lower gear housing , hooked up a pressure tester to the oil vent , put in 15 psi , after 6 hours it has gone down to 13 psi , any thoughts why ? , I will let it go overnight to see if it keeps going down , maybe my homemade...
  6. S

    egnition fuse blowing

    Have a 1991 searay with 4.3 mercruiser , alpha1 drive, keep blowing the ignition fuse [20 amp under the dash] , used to start ok then run using the muffs, increased the rpm , was ok ,let off on the throttle then it would die. Now as soon as I turn the key to run only the fuse goes + my nav light...
  7. S

    ignition fuse blowing

    I have a 1991 searay with 4.3 l mercruiser , alpha 1 drive , sometimes the engine will crank & start , then run for awhile then just die. It ALWAYS SEEMS TO BLOW THE 20 AMP IGNITION FUSE. Last time it was running I increased the throttle awhile, then when I left off on the throttle it blew the...
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