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  1. K

    MSD 6m-3l worth it?

    M.S.D. My Spark Disappeared
  2. K

    OMC 2.5L milky oil after short time

    Take a look at the rotor shaft to see how much the shaft can be moved against the points. There is a good chance that the distributor is worn. The bushing in the block wears and the causes the points to not hold a steady gap which effects the timing to also not hold. Also remove the breaker...
  3. K

    Question about gear ratio

    The pre 73 OMC high profile 4 & V6 and 120- 155 HP used the same drive. Is your boat built before 73? Most 73 on are low profile and are 4” shorter. The 80-90 models were early to 60s and the lower gear housings were the small electric shift outboard units. Can you post a picture of your drive...
  4. K

    Mag 350 5.7 Still overheating

    Does your boat have a water pressure gauge? If it turns out that the engine is really overheating. And your drive is a Bravo, may have a case of Bravoitis. There probably is a restriction in the water supply line between the intake on the drive and the transom plate. Does the exhaust exit...
  5. K

    Overhauling my 1988 MerCruiser 4.3 ltr. engine

    The sealer you used will work fine. I have used it many times. The main thing is you used sealer.
  6. K

    Engine conversion - Is it doable?

    For just over 6k you can get a brand new 5.7 marine engine with manifolds that will have all the attaching locations your current engine has which will be a slam dunk. Check out Marine Power in Pontchtoula La. They have dealers around the country which may be near your location. PS, Thanks for...
  7. K

    Likely cause of compression loss in cylinder 1

    Also could be a broken valve spring or the rocker arm stud pulled out on account of a stuck valve.
  8. K

    Cracked Block???

    They usually crack first under the intake manifold. That is the thinnest part of the block. That freeze has probably broken a lot of marine engines.
  9. K

    Any Other Ways To Solve Bravoitis?

    There was a discussion on the Donzi site and the consensus was to plumb through the bottom of the hull and use a “Y” connection to to join the incoming water from the drive and the through hull to the pump, end of problem.
  10. K

    3.7l 190 4bbl carb question.

    Just make sure the timing is set and it also would be a good time to convert to a Petronics ignition. Depending on how you are going to use the boat can determine the best propeller. The main thing is you want to get the max rated rpm. Is the hull in good condition and not water logged and how...
  11. K

    Is my 77 Inline 6, 250 CID, 165 HP a GMC or a GM Chevy

    All GM truck engines have the extended “ear” on the starboard side which is used for the front engine mount. I have seen auto style engines in boats where a bracket was fabbed up. These engines are getting harder to find and if you cannot locate a truck engine then with some work a bracket...
  12. K

    aq171

    Volvo and maybe some aftermarket suppliers provide yellow stripes on the belt to help Aline the timing marks on the respective sprockets. There is a small hole on the tensioning rod you put a small rod through that keeps the spring compressed on the tension pulley bracket to make it easy to...
  13. K

    3.7l 190 4bbl carb question.

    2Xs with AD. However unless you have a way of measuring o2 then changing jets, rods and the power valve spring will be a shot in the dark. The main thing is that the engine is in good condition and the boat has the correct propeller and the secondary air valve is opening all the way a WOT. And...
  14. K

    aq171

    You need to get the correct Volvo service manual first. There is a possibility that there is a problem with the tensioner pulley.
  15. K

    Overhauling my 1988 MerCruiser 4.3 ltr. engine

    You better look inside of that carburetor, I bet it is not in good condition. I suggest you rebuild the original one.
  16. K

    74 omc 190 engine zincs location

    The only zink on your OMC is the #982277 which is located below the intermediate housing exhaust . This zink is on the website that AD suggested. If this is a trailered fresh water boat then it is probably all you need. You can add some small ones to the cavitation plate by just drilling some...
  17. K

    No electric getting to engine

    Just for kicks first check the yellow/red wires coming out of the control box then check the same wire on the small relay near the starter. Those relays are known to fail. A test light is probably all you need to check these circuits.
  18. K

    460 King Cobra oil pump

    It may be that the pieces of metal from the worn cam are stuck in the oil pump screen. Make sure to always add the zink additive supplement to the oil at every oil change or you will be getting real good at replacing the cam.
  19. K

    Planing and then stalling out

    Remove the suction tube from the fuel tank, inside the tube there may be a small screen filter about 1” long. You will have to unscrew the tube from the 90* elbow and push a small rod through the tube to remove it. Also as A-D said the anti siphon can also cause the same problem be sure to...
  20. K

    120hp OMC model number

    Just loosen the drain screws about 3/4 of a turn to be sure. If clean oil starts to seep out you should be in good shape.
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