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  1. Bt Doctur

    Need help, overheating at cruise rpm

    seen that before, assuming your in the water in this video. The base gasket is leaking and your sucking in hot exaust at higher rpm`s because the water pump in the lower unit is above the water and the cavity is empty except for the hot exaust gasses
  2. Bt Doctur

    Mercruiser 3.0L LX Alpha One - Oil Leak

    just remove the outdrive BEFORE tilting the motor
  3. Bt Doctur

    Trouble re-mounting lower unit

    try using 3M weathersrtip on the plastic tube to hold it in place.
  4. Bt Doctur

    Trouble re-mounting lower unit

    the easiest way is to place the lower in a stand using some 2 x 4`s and installing the upper on it , them remount the whole drive. Theres way too much risk trying to force it to fit
  5. Bt Doctur

    Best Way to Reverse Rotation for a 454 Engine?

    And the camshaft
  6. Bt Doctur

    Best Way to Reverse Rotation for a 454 Engine?

    And dont forget to reverse the pistons and conrod oil squirt hole for the cam lubrication
  7. Bt Doctur

    Help me identify what engine I have in my new boat

    may even be a set of "DART" heads .they have both types of valve cover bolts
  8. Bt Doctur

    Mercruiser 5.0L MPI Not Starting, I was driving the boat at a slow pace and it slowly stalled/stopped

    show a pic of ALL the plugs, the one you show has severe detonation damage and the piston probably looks worse
  9. Bt Doctur

    Alpha one outdrive gearbox rebuild question

    oil from the drain holes does not mean the upper seals were the problem and most likely is the seal in/under the water pump base.Alpha 1 or the alpha 1 GEN II are both easily replaced. The play in the upper shaft is normal with the top cap off, There are 2 seals in the upper , input shaft is...
  10. Bt Doctur

    Outdrive will not go back into transom

    the lower shift shaft looks correct, the upper shoe needs a slight adjustment to be perfectly straight
  11. Bt Doctur

    HELP!!! Monterey 256 Sport Cruiser 1996

    turning the engine by hand with the bolt holding on the harmonic balancer with a 15/16” socket. Not really recommended ,your taking a chance of breaking the bolt or stripping out the crankshaft threads. Most of what you describe is a intake valve not seating all the way or a bad valve grind or...
  12. Bt Doctur

    Mercruiser water pump

    use the standard pump and install a electric fuel pump correctly, much better off
  13. Bt Doctur

    454 MPI seawater impeller

    impellers only get like that from lack of water
  14. Bt Doctur

    Mercruiser 4.3 starter issue

    when it stops ,what happens if the turn the flywheel 2 inches? If it now catches and stops again you have damaged teeth on the ring gear
  15. Bt Doctur

    Trim pump rebuild

    a merc hyd pump can be fitted in there and with some minor relay work will do the same job
  16. Bt Doctur

    Boat reverse polarity

    or your extension from the house is backwards
  17. Bt Doctur

    Leak into bilge, bellows?

    an old control cable will work too ,its solid SS
  18. Bt Doctur

    lower unit replacement

    what broke? the bow eye, the nylon strap or the rusted cable or did someone remove the safety chain before the wheels were in the water
  19. Bt Doctur

    MerCruiser alpha 1 gen 2 tapping noise in lower half

    its the gen II type, to properly do what your doing and to preload the gears turn the unit upside down. those gearsets force the pinion upwards or use the tool to keep the driveshaft raised up by spring pressure.
  20. Bt Doctur

    Leak into bilge, bellows?

    Incorrect, main bellow is specific for Alpha and alpha gen I alpha has clamps at both ends, gen II uses 1 clamp and 1 sleeve
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