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  1. Bt Doctur

    1991 Volvo Penta 570A - high voltage on pos terminal of ignition coil

    if your coil says to use a ballast resistor then you need one. If it does NOT say "use ballast resistor" then full voltage is ok Try a ballast resistor from a Chrysler car 60`s to 70`s
  2. Bt Doctur

    Bravo 3 Oil Leak - Oh No !!!

    the tight fit of the oil hose work well without clamps. There is zero pressure in the system . Most likely the hose itself is the leak. When you start the repair CUT the hose first. You dont want to break the plastic nipple end at the transom end.
  3. Bt Doctur

    NLA shift cutout switch retrofit options

    The new switch is NC and opens a circuit. To use the new switch it need to be "in series" to the coil. activating the switch cuts power unlike the old type that put a ground on the coil what activated
  4. Bt Doctur

    Mercruiser 7.4 Dipstick Tube Broke, Can't Remove Oil Pan

    Drop the pan and push it up and out
  5. Bt Doctur

    Cannot kill boat

    or a diode in the alt allowing it ti backfeed. try removing the alt output led
  6. Bt Doctur

    Mercury MCM165 6CYL 250CID Exhaust Riser for Holley Sniper

    Nothing to gain with a motor that old. Learn how to repair/adjust carbs and you be just fine
  7. Bt Doctur

    Mercruiser Alpha 1 vs SEI

    Not all sei drives will whine. Their warranty is 3 years,unconditional .Merc doesnt offer that. Drive on my current boat is a sei,not a sound
  8. Bt Doctur

    OMC Cobra 3.0L Starter Wiring

    B battery cable, main system power ,alt charge wire. S yellow/red from slave to operate the starters solenoid
  9. Bt Doctur

    Water Streaming from Weep Hole After Impeller Change

    none of my drive squirt like that.something is not right . That is a drain cavity but never seen it with any pressure . It`s not like a outboard pisser
  10. Bt Doctur

    1990 3.0 mercruiser ignition voltage issues

    Check the connections at the starter
  11. Bt Doctur

    A Unique problem I have never seen

    That or too much Georgia White Lightening
  12. Bt Doctur

    A Unique problem I have never seen

    most FWC mercs have the exaust manifolds in the system also Should be interesting, will try to have some pics or video
  13. Bt Doctur

    A Unique problem I have never seen

    Have never run across this in my lifetime. Customer buys a boat from Georgia, 5.7 MPI BIII. no water test, no history just that it was winterized. Engine oil is clean and full , belt in good condition, overall appearance VG.bateries are good Now the only problem is the HX is filled with clean...
  14. Bt Doctur

    Mercruiser 4.3 water in block

    Water in multiple cylinders? Then suspect poor winterizing. Question them on their procedure.
  15. Bt Doctur

    Mercruiser 3.0 tks noise at idle or no wake speed

    Whatever you call that thing in the valve cover
  16. Bt Doctur

    Alpha lower unit crack in strange place?

  17. Bt Doctur

    Alpha lower unit crack in strange place?

    That is a drain cavity that did not drain and cracked the case outward. The bottom of that cavity is supposed to have a drain hole . Once filled with sand, saly, debris it cannot drain and will result in a crack. During normal servicing a long drill bit is tun down the cavity to clear the crud...
  18. Bt Doctur

    Confused with 5.7L Timing Cover Replacement

    serial number says bolts and grommets so I`d say plastic housing number says 1997efi 90-80950095
  19. Bt Doctur

    Mercruiser 3.0 tks noise at idle or no wake speed

    I heard something like that, it was the hollow pvc fitting causing the whistle
  20. Bt Doctur

    3.8 water gushing from engine

    They are "CORE PLUGS" not plugs for freeze protection
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