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  1. K

    94 omc cobra no spark

    Punch up 1994 OMC Cobra engine wiring and the schematic will come up.
  2. K

    94 omc cobra no spark

    You should have a hot blue spark that will jump at least 1”. Petronics kits do not work on OMC Cobra shift systems. Just for kicks disconnect the ESA system and see if things improve. If the spark improves you will have to convert back to a points system. Without ESA working shifting will be...
  3. K

    MC-1 Drive Dog failure?

    Be sure to use glue to hold the large rubber ring in the bell housing and the water passage “O”ring. The gasket is a dry fit.
  4. K

    Keep blowing my starter solenoid up.

    Another place to look is behind the instrument panel. Touch every wire terminal to check for a loose terminal. Of all the marine relay/solenoids I have experience with the small ones are the most troublesome. I have had defective ones right out the box on some occasions. The older style large...
  5. K

    Volvo aq270T gimbal bearing

    If your PDS \flywheel housing is 1 piece there is a good chance there is only 1 bearing in the rear and it can be replaced without pulling the engine. Just hope that the PDS shaft is not rusted into the flex plate. If there are 6 bolts going through the PDS housing into the flywheel housing...
  6. K

    Keep blowing my starter solenoid up.

    A bad ground will also cause a voltage spike.
  7. K

    Engine, Carb or Prop? need suggestions or ideas please.

    I just did a search and the 1986 4.3 base timing is 6*. All your other specs are correct. Are you sure that you have a genuine Marine carburetor and the fuel pressure is 5-6 lbs? Maybe you should contact Cliff’s Quadrajets to make sure you are going in the right direction with the changes...
  8. K

    MC-1 Drive Dog failure?

    Great save on the water pocket bolts. After having ruining a case many years ago I have had some success afterward by first breaking the cover apart then with a lot of heat and patience working the bolts out. I never thought it would be possible to drill out the broken bolts. Good job!!
  9. K

    Volvo penta trim relay issue

    If what SD suggests and the problem persists then it is possible that the brushes in the motor are stuck or the springs that tension the brushes are corroded away. They can be matched up at a hardware store. And from the condition of the motor housing the cause may be internal.
  10. K

    '71 Starcraft 21'. I/0 Merc. Spark interrupter switch???

    Your problem is in the upper gear housing where the shift slider travels for reverse. The switch is not the problem. There is a build up of crud in that area preventing the slider with just enough resistance to activate the switch. Jumping a wire from the battery will not help and end up...
  11. K

    Grease fitting 76 OMC 175

    The thread pitch is 1/4”X 28 for Zerk fittings. Do not worry about replacing the red plastic plug or trying to find a new one. 400-800 drives just have a un threaded hole in the same place.
  12. K

    Mercruiser dies after getting on temp

    Before starting the engine connect a volt meter to the +side of the coil. Set it up so that it stays connected and run the engine until it stops, the voltage should not go below 8-9 volts. If it does go down then the resistor wire is the problem. Sometimes the rotor will go to ground when...
  13. K

    Stringer boot recommendations?

    You probably have the electric shift seal which is #313080. Sierra #18-2767 What you need is #909527 Sierra #18-2768 for 400-800 drive.
  14. K

    alpha 1 won't go into reverse

    Another place to look is the pocket that the slider travels in for reverse in the upper gear housing. Crud will build up in there and restrict the slider.
  15. K

    1972 Mercruiser 165.

    If they are stern drive engines you might have a problem separating them from the intermediate housing. Those particular models tended to rust the drive coupler to the shaft. If this happens I can walk you through the procedure to seperate them.
  16. K

    1972 Mercruiser 165.

    FW cooled engines are a safe bet. The OMC exhaust manifolds enter the exhaust down pipe the wrong way for Mercruiser. You will have to use the Mercruiser manifolds. You will have to swap the wiring harness and use the Mercruiser alternator With the bracket. The carburetor, fuel pump...
  17. K

    81 omc sterndrive

    Early OMC 400&800s had hydraulic shift with an oil pump in the lower gear housing. Then they went to non hydraulic. The shift converter‘s for the drives operate opposite if my memory is correct. If your drive has the hydraulic system, disconnect the shift cable from the throttle control on the...
  18. K

    Engine issue— Mercruiser 5.0L, 305, 2 barrel mercarb

    Try running the boat with the engine cover open the same exact way to see if it continues running. Or with the bilge blower on. It could be that the heat from the non jacked exhaust manifolds are building enough heat in the enhine cover to cause vapor lock or boiling the gas in the carburetor.
  19. K

    Weak spark, no start after bump in road 86 OMC 4.3

    NLA Marine205 984 4400 has a used distributor for $160.00 that has the original ignition points and condenser. Part # 0986060. This is your only solution to thee problem.
  20. K

    Mercruiser 3.0 won't throttle up

    You need to get a feeler gauge and set the points @ .016-.017. Good that the springs are working. However how much will he points open and close by pushing sideways on the rotor shaft? Point gap effects timing and trying to compensate with a timing light and moving the distributor is not...
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