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  1. Bt Doctur

    Alpha1 and Alpha1 Gen II U joints

    There are two different U joints for these drives listed. Early for MC1 and Alpha1 and later for Alpha1 and GEN II type, Installed mine last year and missed the size difference in the cups. Never needed to trim up when running so never felt the banging.Heard the noise and pulled the drive and...
  2. Bt Doctur

    Flushing raw water side of 5.7GXi-HF

    I think your over thinking a problem that does not exist
  3. Bt Doctur

    3.7 gets hot while idling

    most likely a clogged/restricted exaust elbow
  4. Bt Doctur

    shift cable thread insert repair

    just did what needed to be done,heli-coils are too large and this was the best option for the repair. locating that coupling in that size was the hardest. and i bought them all .sure beats buying a replacement housing.Also found out that the mercruiser low pressure pump is an exact replacement...
  5. Bt Doctur

    Can I grease gimball zerc while boat is in the lake

    no amount of grease will quiet down a bad bearing from water intrusion or severe mis-alignment, but removing the drive is highly recommended at winterization to inspect everything else and grease the U joints if applicable
  6. Bt Doctur

    Safety Lanyard Switch for a 2008 5.0 GXI

    Any marine store should have what you need to be compliant, Typicaly a 2 wire cut into the purple wire from the ign switch
  7. Bt Doctur

    volvo low pressure fuel pumps

    If you have the volvo low pressure pump for your carb and the plug on topis acting you can replace it with the mercruiser one https://www.ebay.com/itm/296309249910 Works just like the volvo pump , bolts right up . You must remove 2 bolts and swing the bracket out of the way, screw on the...
  8. Bt Doctur

    New Y pipe

    remove drive approx 1 hour prep engine for removal avg 2 hours Y pipe 2-4 hours depending on any seized bolts reinstall engine and hook up avg 3 hours install drive 1 hour, test run , return to service
  9. Bt Doctur

    Exhaust elbow gasket replacement 4.3L mercruiser

    and no matter what gasket ,wire wheel both surfaces, then PermaTexAviation sealant both sides
  10. Bt Doctur

    Prop shaft mercruiser MC-1

    44-66060
  11. Bt Doctur

    Engine keeps running after power shut off

    the diode is in the alt. its backfeeding . try removing the orange wire at the alt output post
  12. Bt Doctur

    R/R Fuel Pump brass fittings what sealant do I use?

    Perma-TexAvation sealant
  13. Bt Doctur

    Dry Chuffing Noise 1st Day of Season 1997 7.4LX MPI

    sounds like a noisy gimbal bearing
  14. Bt Doctur

    Engine keeps running after power shut off

    and the alt has a shorted diode in it back feeding the system
  15. Bt Doctur

    Carb issue.

    incorrect needle and seat or float adjusted wrong
  16. Bt Doctur

    shift cable thread insert repair

    developed this in 2019 and installed it in my boat, no issues so far For alpha1 and alpha gen ii housings Here you go 39/64 drill bit ..6094 , 1/4 inch pipe coupling, 1/4 x 18 NPSF tap , Red Loc-Tite. With 1 hex machined off, the O.D of the sleeve is .619 leaving a .010 press fit. Once...
  17. Bt Doctur

    90 Amp Fuse Question

    what you will find is the alt protected by the 90A and also the main power for the but but thats after the 50A CB, blow the 90 and your dead in the water, move the red wire directly to the starters main post and all you can lose is the charge from the alt
  18. Bt Doctur

    So I ended up sinking a bit.eek! 82 sea ray

    you mention taking on water but make no mention of the automatic bilge pump that should have alerted you?
  19. Bt Doctur

    Mercruiser 120 1984 model kill-switch activates too easily

    cab be: corrosion in the shift mech when in reverse especially the slide a bad cable There is no lubrication of the lower shift cable core
  20. Bt Doctur

    Alpha I Gen II Impeller Replacement

    the curved section is installed first in the upper unit , the guide tube and O eing retainer goes on the pump
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