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  1. Bt Doctur

    MC-1 Transom Mount Switch ID.

    Can never understand why someone will cut a steel fuel line to add a filter with rubber hose to blow themself up plus not being coast guard or insurance approved and then complain when they get blown up with no insurance. Its supposed to be in the suction side of the pump. On the Blue motor is...
  2. Bt Doctur

    Spark plug

    in the first pic the plug on the right is not what you find in marine engines. MR43T is the short reach, MR43LTS is the long reach https://www.napaonline.com/en/p/AC_R43XL https://www.napaonline.com/en/p/AC_R43XLS?impressionRank=1 Still should be 5/8 ths socket
  3. Bt Doctur

    4.3 mercruiser water inlet tube replacement

    https://drive.google.com/file/d/1qohfRhFvRvMu-jrZPZ7W64eHw7EjUywp/view
  4. Bt Doctur

    AQ131 dwell setting

    set the points gap at .019 then check the dwell .Most are 29-32
  5. Bt Doctur

    2015 4.3L mercruiser stalling issue

    the switch will only activate IN THE WATER coming out of gear. Any other time is a bad shift cable or corrosion
  6. Bt Doctur

    Connecting water heater to engine ? Advice needed !

    In most cases one connects to the engine circ pump and the other is near the front stbd side of the intake manifold
  7. Bt Doctur

    2015 4.3L mercruiser stalling issue

    watch the interupter as you shift out of gear . If it hangs instead of springing back you need a new shift cable
  8. Bt Doctur

    Was running now will not turn over DISTRIBUTOR, TIMING, #1 on CAP & PLUG WIRE LOCATIONS

    To find #1 remove #1 sparkplug and dist cap. crank motor till you hear a "puff" of air. This is #1 compression stroke. Now look at the timing mark on the harmonic balancer and turn motor until timing mark is on zero. This is TDC of #1 wherever the rotor is pointing is now called number one...
  9. Bt Doctur

    4.3 mercruiser water inlet tube replacement

    the hose is clamped on the outside and held captive by a rubber ring and 2 bolts
  10. Bt Doctur

    4.3 mercruiser water inlet tube replacement

    I`ll assume the drive and housing components are removed and the water hose removed.Then remove the 2 bolts remove bushing, twist and remove inlet tube
  11. Bt Doctur

    MC-1 Transom Mount Switch ID.

    pic 2 the left is reverse lockout, the right is shift interupter
  12. Bt Doctur

    A Unique problem I have never seen

    Final follow up Oil was placed in the plastic overflow bottle and only the heat exchanger was compromised. Motor was not run so no mixing tool place. No oil in the lower hose to the circ pump. So just a HX cleaning and degrease and were good to go.
  13. Bt Doctur

    Need Penta AQ125a Carb -1983 Bayliner

    If Solex, pm me
  14. Bt Doctur

    Solex phn3 carb

    I have solex carbs from a inline 6
  15. Bt Doctur

    1991 Volvo Penta 570A - high voltage on pos terminal of ignition coil

    if your coil says to use a ballast resistor then you need one. If it does NOT say "use ballast resistor" then full voltage is ok Try a ballast resistor from a Chrysler car 60`s to 70`s
  16. Bt Doctur

    Bravo 3 Oil Leak - Oh No !!!

    the tight fit of the oil hose work well without clamps. There is zero pressure in the system . Most likely the hose itself is the leak. When you start the repair CUT the hose first. You dont want to break the plastic nipple end at the transom end.
  17. Bt Doctur

    NLA shift cutout switch retrofit options

    The new switch is NC and opens a circuit. To use the new switch it need to be "in series" to the coil. activating the switch cuts power unlike the old type that put a ground on the coil what activated
  18. Bt Doctur

    Mercruiser 7.4 Dipstick Tube Broke, Can't Remove Oil Pan

    Drop the pan and push it up and out
  19. Bt Doctur

    Cannot kill boat

    or a diode in the alt allowing it ti backfeed. try removing the alt output led
  20. Bt Doctur

    Mercury MCM165 6CYL 250CID Exhaust Riser for Holley Sniper

    Nothing to gain with a motor that old. Learn how to repair/adjust carbs and you be just fine
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