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  1. Bt Doctur

    1996 Horizon 220 5.0Fi raw water pump issues.

    If the pic of the impeller also has the front pully it looks like the rotation is backwards. pump and pully rotate clockwise for a standard rotation engine
  2. Bt Doctur

    Swapping out ujoint splines?

    your serial number come back as Find MerCruiser 120 GM 153 I / L4 1972-1978 Engine & Stern Drive by Serial Number Range ans shows the inputshaft as 39385A1
  3. Bt Doctur

    Swapping out ujoint splines?

    Is this the same drive that came off and was any work done to it? Did you check the alignment with an alignment bar? Is the length of the inputshaft the same?
  4. Bt Doctur

    Gear Lube Hose

  5. Bt Doctur

    Thrust washer issue

    https://www.perfprotech.com/mercury-marine-parts-catalog/collection/01/mercury?category=15-hp#hp-table
  6. Bt Doctur

    Hunting for Gen 1 SN

    without the inner small ring you must use the rolling torque method or find a small ring and install it and then just torque it
  7. Bt Doctur

    79' Merccruiser 260 fuel pushrod question

  8. Bt Doctur

    79' Merccruiser 260 fuel pushrod question

    I have used a fuel pump blockoff plate and the original bolts to mount the bracket for the pump. In most cases you can still use the steel line to the carb by adding the correct fitting. You can use the Carter style or the mercruiser low pressure electric one. Iboats has the pressure switch and...
  9. Bt Doctur

    Hunting for Gen 1 SN

  10. Bt Doctur

    Hunting for Gen 1 SN

    If your the original owner is this a GEN II ?. If the upper gears were replaced the new type says leave it out and use rolling torque method. I prefer to leave it in place and just torque the nut down. Serial number should be visable in the mercruiser decal If the decal has been replaced ...
  11. Bt Doctur

    Gear Lube Hose

    inside the boat or outside the boat
  12. Bt Doctur

    Thrust washer issue

    https://www.marineengine.com/parts/mercury-quicksilver-propellers/page79.html whats your engine serial number and what is that part number have never seen one like that with a stem on it
  13. Bt Doctur

    Mercruiser mpi ecu mapping

    trying to get a 5.0 to perform like a 6.2 is just nonsense
  14. Bt Doctur

    Volvo Penta SX-A drive U-Joints

    Re: GKN Style U joints Well Don was right once again. I get why you sent me there Don. Since the Sierra number is 18-6406 and that cross references to a Volvo u joint withthe number 3860232. There is some info on the net for that PN from Volvo. Neapco 1-0005 note: All units I found had the...
  15. Bt Doctur

    Breaker bar rotating 2.5

    check your messages, $9.95
  16. Bt Doctur

    Help with Battery issues after stereo install

    14Ga will carry 15 amps safely. Almost all electronics and stereo`s are Red, main power using a separate switch, Yellow is always on ,it is the memory
  17. Bt Doctur

    79' Merccruiser 260 fuel pushrod question

    With th pump removed push the rod inward while someone cranks the engine, Remove the coil plug or remove the + side of the coil wires. Rod must move or the cam is wiped. If there is no movement, install and leave the pump in place and install an electric pump and safety pressure switch and cube...
  18. Bt Doctur

    Shift cable brass pinned to threads

    a bad idle air controler
  19. Bt Doctur

    Shift cable brass pinned to threads

    being MPI it is controlled by the throttle position sensor so disconnect the throttle cable to see if that is the problem, Yes, adjust the barrel.
  20. Bt Doctur

    Damaged Shift Washer?

    that damage happens when the upper shoe is forced onto the lower spline by drawing the nuts together and forcing it together
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