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  1. K

    New to omc bought I think 78

    Put a garden hose in the hose that goes from the transom to the thermostat housing.
  2. K

    Strange tach behavior on a Penta 5.0L

    You will need a new lower gear case or try removing the exhaust bellows to cause the exhaust to blow out before the propeller. Try to compare your gear case to another one where the propeller fits in the gear case just to be sure.
  3. K

    Strange tach behavior on a Penta 5.0L

    The rear of the gear case where the propeller fits in that makes the labyrinth seal looks like some of the rear edge is worn away. If that is the case then too much exhaust is going over the propeller than through it causing cavitation.
  4. K

    Mercruiser 3.0 Exhuast Port Corrosion on Head

    JB weld should work as AD suggested. I bet that the gap where the engine cover meets the rear panel is letting water land on top of the engine. Try to make a shield that will direct the water away from the top of the engine.
  5. K

    Engine is in, successful run?

    Is the fuel pump being controlled through a oil pressure safety switch? If not should the carburetor “flood over” and the engine stops then the fuel pump will keep pumping and a fire could result.
  6. K

    Tuning Holley 80551 (4160)

    Is it a marine carburetor?
  7. K

    Partial Power... Part of the Time!

    Things were pretty crazy when the first Cobras came out. I did a a few re powers which finally was able to straighten out with help from OMC. They were really good with warranty problems and never questioned any of my requests. Mercruiser was a different story sometimes. Petronic ignition...
  8. K

    Partial Power... Part of the Time!

    I wish that OMC would have kept it simpler with the same shift dog from the beginning As Mercruiser. The very first 800s I installed were chewing the dogs up because they used the same 90* dog angles as the outboards. While that same arrangement worked on outboards it did not on stern drives...
  9. K

    Partial Power... Part of the Time!

    Of course OEM is very good, I like most of the Sierra products but I do not know where the ignition parts come from. If foreign parts are made to real factory specs using the same materials then yes I feel that would be good. It is too bad that the Prestolite electronic conversion does not work...
  10. K

    Partial Power... Part of the Time!

    The main thing about points and condensers is only from some place like NAPA. All that foreign junk you should stay away from. If the points have tiny white spots on them that is from moisture, you can file them but they will fail.
  11. K

    Upper Gear Housing Swap

    Any low profile gear case from 73 to end of production will interchange. If just the water pump housing is freeze damaged then the case should be still good.
  12. K

    Upper Gear Housing Swap

    You will just have to play around with propellers but it should work. The gear ratio on the 140 case is around 2; 1 and a the 165,170&190 were 1;8 so you will have to go at least 2” more. Does the replacement have the same internal steering gear?
  13. K

    Partial Power... Part of the Time!

    I had a similar problem with the Donzi. After chasing a non existent fuel problem and even with the Mercruiser Rinda scanning tool which would show no problem codes I replaced the plugs. I went to NAPA and asked for the most expensive plugs available. The boat had been in storage with just 30...
  14. K

    Sudden high rpms, loss of speed, smooth engine, not the prop..

    Just have someone push the throttle wot and be sure that the carburetor butterflies goes all the way open and stays, not trying to start closing. If you ever watch the way the control works on the back side you will see what can happen. It just depends on who rigged the boat and set up the...
  15. K

    Sudden high rpms, loss of speed, smooth engine, not the prop..

    My favorite tried and true method is to by pass the tank with a 6 gallon outboard tank. That method usually narrows down the problem.
  16. K

    Sudden high rpms, loss of speed, smooth engine, not the prop..

  17. K

    Sudden high rpms, loss of speed, smooth engine, not the prop..

    Make sure that the throttle is opening the carburetor all the way and not “over stroking” which means the throttle goes all the way at one setting and if it goes further it starts to slightly to actually pull the carburetor off of WOT. Under most situations the description points to a wrong...
  18. K

    Sudden high rpms, loss of speed, smooth engine, not the prop..

  19. K

    Removal of AQ170 engine.

    After the engine is removed and if it turns out that the PDS shaft is rusted into the flex plate then the only way it can be removed is by using a 1” hole saw and cutting a hole in the outer perimeter of the flywheel housing to gain access to the bolts that mount the plate to the flywheel. If...
  20. K

    Tilt/Trim backwards

    If the original hydraulic one still works just keep using it until it quits then start using the “ear muff” one.
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