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  1. Bt Doctur

    Strange exhaust behavior during winterizing

    The biggest killer to the motor is clogged block drains, You must remove the quick connects from the fitting to insure complete draining of the block. From what you describe you never drained the motor only the manifolds and hoses. To be safe drain everything ,pull the block drains and probe...
  2. Bt Doctur

    Seized engine

    Remove the outdrive and make,beg,borrow a T bar from pipe and a used input shaft welded up. Remove the heads to determine the damage. spray a -penetrating oil in the cylinders . Heat the tops of the pistons with a torch `use penetrating so;vent. add a length of pipe to the T for leverage and try...
  3. Bt Doctur

    Thermostat GLM13230 OEM # 87290A4

    pull the drive ,stick a hose in the water inlet hole and retest
  4. Bt Doctur

    Alpha 1 Gen 2 - leak & transom service questions

    remove the drive and plug the relief holes .drain and remove the risers, fill Y pipe with water to see if it leaks inside the boat
  5. Bt Doctur

    Alpha 1 Gen 2 - leak & transom service questions

    rot in transom, corrosion of the Y pipe or corrosion of the transom housing May have to pull the motor to determine what part it is
  6. Bt Doctur

    Replace rear seal on transmission 7.4 L inboard mercury

    the rear trans seal can be replaced without pulling the motor IT AND ITS A BIG IF you can slide the prop shaft back far enough to remove the coupling from the prop shaft. Last one I did this way was to remove the prop first because it hits the rudder
  7. Bt Doctur

    Replacement Trim Hydraulic Pump for OMC Sterndrive

    probably a mercruiser one
  8. Bt Doctur

    No Spark – 1998 MerCruiser 5.7L Thunderbolt V Ignition

    do the test of the white/green striking a ground. If you get spark the module inside the dist went bad. and is economically replaced . If your switch is a N/C type then to make it work it needs to be spliced in series with the coils purple wire to interrupt power the normally open switch...
  9. Bt Doctur

    Alpha 1 Gen 2 shift shaft seal replacement

    77674 .35 x .75 x .12 1/8th inch thick
  10. Bt Doctur

    Water leak

    guessing the water inlet O ring is missing/damaged and your forcing water into the main bellow, pull the drive to inspect
  11. Bt Doctur

    Rebuilt my mercarb, now runs awfully

    could by a standard 2bbl on ebay thats not painted inside for around $90
  12. Bt Doctur

    Water pump leak?

    never grease or oil on those types of rubber products, use K-Y products
  13. Bt Doctur

    Is this engine oil good?

    mercruiser V6 flat tappet motor .I use this runs cooler, has high zinc, and has much better oil pressure when hot Shell Rotella 5 gal. 15W-40 T4 Motor Oil
  14. Bt Doctur

    Mercruiser 3.7 4 Barrel Electric Choke

    https://duckduckgo.com/?q=rochestor+electric+choke+elements&t=newext&atb=v337-1&ia=web
  15. Bt Doctur

    Low Voltage at RPM?

    losing voltage at rpm could indicate a winding opening up at high rpm inside the alternator
  16. Bt Doctur

    guardian mode, low water pressure after replacing impeller

    low water pressure and high temps are a sign of a water restriction, You dont list a drive but mentioning a impeller in the drive is either a alpha1 or gen II.
  17. Bt Doctur

    1979 Cobalt 18DV w/ MerCruiser 260 and Alpha 1 - No Raw water to engine

    isn`t that feed hose on the wrong side of the T housing?Water inlets are normally on the port side
  18. Bt Doctur

    guardian mode, low water pressure after replacing impeller

    Fine but whats the engine temp doing
  19. Bt Doctur

    alpha 1 gen 1 noise

    I agree, gimbal check and oil check for any metal ,never heard a bearing sound like that
  20. Bt Doctur

    1989 mercruiser Aplha One. water temp senor issues

    usually with the housing facing up in a normal position the sender is stbd and the alarm is port
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