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  1. Bt Doctur

    Marvel Mystery oil in a 2004 5.0 engine

    it no mecanic in a bottle but my f250 went over 400K using it in both gas and oil
  2. Bt Doctur

    SX-M Gimbal Bellows Spring

    it supports the bellow,
  3. Bt Doctur

    MC-1 New Shift Cable Won't go Through?

    just cant pull it thru, it has to pass thru a small hole in the transom housing .Once thru the shift bellow, just feel your way thru but be careful not to enter the flywheel housing
  4. Bt Doctur

    Fuel gauge issues

    In the 4th pic polarity does not matter Most show Black as the hot. but unit should work in either direction.For the gauge, Blue is lighting, Purple is ign power, Black is ground, Pink to sender
  5. Bt Doctur

    looking for a service manual

    OMC 502Aphue put that in your search bar ,you will see the link
  6. Bt Doctur

    4.3 tb IV no fire from coil

    sparkplug firing order correct?
  7. Bt Doctur

    Electric fuel pump issues

    I install a priming button either on helm or engine compartment. Aids in refilling the fuel filters
  8. Bt Doctur

    alpha one gen 2 install lower driveshaft

    I can only add it somewhat confusing. when inserting the prop shaft on an angle you catch the shift selector ,(the "C" shape) in the shift spool, straighten the prop shaft and see with the shift rod in a straight line the prop shaft turns ccw when turning the lower drive shaft cw
  9. Bt Doctur

    Mercruiser 165 4 cylinder running hot

    I`ve heard of people placing the guide tube on the copper tube and miss the pump top
  10. Bt Doctur

    Single point drain winterization

    its a 3 way fitting ,no can do
  11. Bt Doctur

    Mercruiser 165 4 cylinder running hot

    before you go thru all that, remove the inlet hose, start motor, water should exit almost immediately from the hose end IF the pump replacement went ok.If the copper tube did not enter the guide tube no water will make it to the engine
  12. Bt Doctur

    No spark

    can you explain what is happening when trying to start the motor
  13. Bt Doctur

    No spark

    The thunderbolt has 5 leads. black ground, purple and grey to coil, White/W red stripe and White/W green stripe to dist. These have nothing to do with the neutral safety switch that is in the control box to prevent starting in gear.
  14. Bt Doctur

    No spark

    but when I put the ignition module ground on the safety switch closes. ?????????????????????????????????????
  15. Bt Doctur

    Single point drain winterization

    These accept the blue winged plugs
  16. Bt Doctur

    Single point drain winterization

  17. Bt Doctur

    Single point drain winterization

    Remove the hoses and fittings in the block and install removable drain plugs. Remove the manifold drains and hose and install ones with removable blue plugs to drain the manifold. At the pipe where the hoses come together just loop the hoses or remove the pipe manifold and replace w copper tubing
  18. Bt Doctur

    No spark !!!!

    for spark you need power at the + side and a momentary closing and opening of the points.Remove the we from the neg side of the coil , install a jumper with enough we to reach a good ground. With key on, strike /scratch the wire along the block, you must produce spark. If yes then the points are...
  19. Bt Doctur

    Mercruiser 165 4 cylinder running hot

    thermostat has nothing to do with water leaving the exaust.
  20. Bt Doctur

    No spark !!!!

    that means the points are not grounding out when the rotor is turning
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