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  1. Bt Doctur

    Rotation

    all 4.3`s are left hand rotation when viewed from the flywheel. all merc drives have a right hand rotation OF THE PROP
  2. Bt Doctur

    4.3 longer cranking after sitting few days n when hot

    A week of high temp will vaporize fuel from the carb and leave the bowls dry.Results in excess cranking .If you have an electric pump you can add a momentary switch to prime the carb usually installed in the eng compartment . You do always open the engine compartment to sniff and look first ,right?
  3. Bt Doctur

    Bad Engine Ground?

    Most issues are caused by the steel ends crimped on the cables instead of copper ones. Also the ends of the cable where its crimped are usually black from corrosion. Cutting back to clean copper and recrimping copper connectors solve the voltage problem
  4. Bt Doctur

    Need Help with 8.2 Mercruiser

    get a better mechanic. could be just some leaking valves from water intrusion or holes in the piston at its worst. Only by removing the head will you be sure
  5. Bt Doctur

    88' Mercruiser 165 harmonic sound

    Ill take a guess and say a cracked flywheel dust cover if its a metallic clanking . Had the same thing happen on mine a long time ago
  6. Bt Doctur

    Thunderbolt IV

    just a guess the tach was causing an issue running the motor,does the tach work now? Blue in that area is the oil pressure sensor and the Blue/white(tan) may be for the "no oil pressure sender"
  7. Bt Doctur

    T-Stat for closed loop cooling system?

    Meaning the housing has a restricted opening to regulate the engine temp, If you also install a stat it will overheat
  8. Bt Doctur

    Stern drive gasket cracked, should I be worried?

    what torque value did you use.usually tight with a 3/8ths ratchet
  9. Bt Doctur

    Starter install help.

    In most cases. there is the main battery cable , then a red,or red/purple .This is the boats main power connection,then the yellow/red wire to the solenoid Some use an additional wire from the other small post on the solenoid to provide voltage to the electric fuel pump for cranking
  10. Bt Doctur

    OMC I/O first test drive, need some part names.

    most just pass the cable thru a hose that is threaded into the transom housing number 40
  11. Bt Doctur

    1995 OMC Cobra v-6 will not rev out under load

    firing order correct? 1,6,5,4,3,2
  12. Bt Doctur

    2009 Mercruiser 4.3l engine wiring diagram

    helpful if you describe the problem your having
  13. Bt Doctur

    Which coil to use?

    but if it did go bad, any gm coil for electronic ign will work. They have internal resisters
  14. Bt Doctur

    Alternator Overcharging

    disconnecting the battery cable lead can do it causing the alt to run wild. dirty connection ,fittings, corrosion,battery switch and connections neg cable at engine loose ,corroded, etc Also a open winding in the alt can do the same.
  15. Bt Doctur

    Wiped cam lobe mechanical fuel pump

    on the pressure switch ,wire it thru a cube relay,This will help preventing damage inside the switch
  16. Bt Doctur

    for discussion

    alpha Gen II housing that was taking on a lot of water. Suspected of using regular bottom paint instead of outdrive paint over the years. What do you think?
  17. Bt Doctur

    Alpha 1 Lower unit. Can’t turn shaft while reinstalling

    rusted up bearing or races in the driveshaft ,the usual culprit is the roller bearing above the pinion gear ,upper shaft bearing not so much
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