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  1. boatdude100

    Is removing head of 3L a DIY job?

    1995 mercruiser 3L Is there a difficult set-up afterwards to get it running? Like valve adjustments or anything or is it just bolt on and torque Thank you
  2. boatdude100

    0 PSI cylander 1 Mercruiser 3L (1995)

    Engine shaking at idle and low speed forward gear. Easy to start when giving throttle. Runs fine high speed. Compression test shows (starting from front of engine.... 0 180 148 122 How doomed am I? Can it be a head gasket, valves or rebuild? Man, this has been a bad day. Any positive thoughts...
  3. boatdude100

    How to do compresson test Mercruiser 3L LX

    I know the answer is here somewhere, I just cant search/find it. (Electronic ignition) Qs: 1. Do I pull all the plugs at once then test? 2. How exactly... do I ground out the spark plug lead that goes in the top of the distributor cap or do I HAVE to do it at all? 3. Does the throttle...
  4. boatdude100

    Must I pull engine fto replace transom? 3L Mecruiser

    Do I have to remove engine for Transom replacement or can I remove outdrive, cut fiberglass and replace from behind? Mercruiser 3L 1996 Bowrider. Is there a way to replace transom without removing engine? Thanks!
  5. boatdude100

    Winterize- Add Antifreeze then drain?

    mercruiser 3L 1995, alpha one - Winterizing Hybrid procedure? Please correct me if this sounds like a bad method: 1. Run to what is hopefully operating temp on Muffs with water 2. Remove thermostat (to make sure antifreeze circulates in case it was not at operating temp) 3. Drain Block - 2...
  6. boatdude100

    motor mount bolts fixed with brace?

    3L Mercruiser, Cutter (Grew) 1995. 2 bolts loose- no doubt rot. Rest of surface they are on seems fairly solid. Having a brace made. Question- 1.if I drill down is there likely a steel support or is what the 2 engine mount bolts go into usually just wood? 2. Any thoughts on the brace idea? it...
  7. boatdude100

    How to wire starter 3L mercruiser 1996 18-5911 Sierra

    Had a smaller auto starter on when bought boat. Bought Sierra 18-5911 starter. This thing is a beast!! (huge and heavy!). Anyways, the old one only had one post option for the small wire- this one seems to have 2! (and no diagram) One seems to be labeled R and the other S?? Q:Which one does...
  8. boatdude100

    Flywheel size for correct starter

    I am trying to match starter motor to flywheel. Not sure if its possible to count teeth on old (automotive) starter but I think I have found the part Teleflex Marine 18-6275 Starter (Sierra) 3L LX 1994 (serial numbers don't bring results) I read: If you have a staggered bolt pattern...
  9. boatdude100

    Correct starter motor 3L GM 1994

    I have the "small" (automotive) starter motor on this boat when I bought it this year, supposed to have the "bigger" one. I cant find a part number anywhere. Serial number tag by starter motor says 367647 stamped on block is 4097080. neither number seems to work in a search. Reason is, I...
  10. boatdude100

    Throttle Cable adjustment instructions please 1996 3L

    I'm trying to adjust idle with idle screw, but need to extend throttle cable a bit so screw comes closer/touches to cam. (I think this is what I need to do to slow down the idle when warm) How exactly do I do this? -There is a brass "nut" part way up the cable that looks like if turned, it would...
  11. boatdude100

    Will a bowrider with wet foam crack the hull when it freezes?

    Bought a bowrider with foam soaked and stringers wet, some rot. replaced much but cant get into wet foam in front section as it is under fiberglass floor. What are the chances it will crack the hull this winter? gulp...
  12. boatdude100

    How can I tell if starter and alternator are marine?

    Bought boat with Mercruiser engine swapped from s10 "old truck Apparantly a car starter and alternator can blow up boat? How can I tell if they are both marine from the old engine or swapped from Mercruiser (alpha one)?
  13. boatdude100

    3L mercruiser had engine swapped for 2.5 L s10. Issues?

    Thought I bought 1995 3L Mercruiser - alpha one but engine I was then told, had been swapped for 2.5L engine from s10 from an "old truck". Was this a compatible engine? What issues may I have? How can I check if starter and alternator are "marine" both have been painted black Starts and runs...
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