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  1. K

    7.4 Bravo water pump driven fuel pump

    The Carter is by far better than the Holley. They cost more for a good reason. You want the oil pressure safety switch also.
  2. K

    VP 280 no reverse

    The brass trunnion with the cotter pin on the main cable. That is what you need to adjust. Leave the other control rods as they are.
  3. K

    Alignment and coupler question 1979 Mercruiser 260

    With a small bottle jack under the front of the engine to raise it, remove the top nut then the lag screws holding the mounts after the mounts are out remove the bottom nuts and reinstall the mounts. Raise and lower the engine with the jack until the alignment is right. If there is space under...
  4. K

    VP 280 no reverse

    Put the control in neutral, remove the cotter pin from the brass trunnion. With the drive in neutral rotate the trunnion until it centers in the stainless lever. If it still does not move enough for reverse then the cable itself may be the problem or the control box.
  5. K

    Valve Adjustments

    If your engine has a roller cam they should not need adjustment. If the timing cover is plastic rather than metal then it will have a roller.
  6. K

    How do I fill the intermediate housing?

    There was no drain until the first 400-800 units in 78.
  7. K

    When my boat is on the trailer, this happens.

    It looks like the reverse lock valve has been bypassed. That is most likely the cause. Later model pumps have the reverse lock valve in their valve body. The valves tend to leak externally and this one is from the late 60s to early 70s. The valves are NLA and used ones are a crap shoot...
  8. K

    When my boat is on the trailer, this happens.

    Does the plastic hose go to the reverse lock valve on the shift linkage? Are the rams the original to the boat? Post a picture of the rams and the shift linkage .
  9. K

    In-boat camshaft replacement - 7.4 Mercruiser

    Place a strong magnet on the oil pan to hold the small chips from the worn cam and lifter. The Grey RTV will also seal the lower timing cover seal area in place of the original rubber strip as well as the china walls of the engine block to seal the manifold. I also always go around the outside...
  10. K

    New Motor same power issue

    HEI distributors require more amperage than the original Mercruiser ignition system. When the HEI is on a GM auto it is fed with a #10 gauge wire. Try jumping from the + side of the battery to the + side of the HEI with a #10 gauge wire and take the boat out to see if that helps. If it does...
  11. K

    87 OMC 5.7 No Spark

    The only thing I can suggest is according to Prestolite their system is not compatible with OMC‘s esa shift system. Try reinstalling the original Prestolite points and condenser. Also try connecting a volt meter to the + side of the coil while running the boat to see if there are any voltage...
  12. K

    When my boat is on the trailer, this happens.

    Try to post a picture of the hydraulic pump.
  13. K

    1987 Volvo penta aq125a starting problems

    Sierra Marine #. 18-5292. This is what fits the Bosch distributor.
  14. K

    1987 Volvo penta aq125a starting problems

    The points should be .020 and the plugs .035.
  15. K

    Everything done but low rpm at WOT. Distributor spring?

    I hope that your fire suppression system is in good order. If that carburetor should ever “flood over” you will have a fire. The carburetor is not Coast Guard approved. And as others have stated you need the correct one as Lou pointed out.
  16. K

    Everything done but low rpm at WOT. Distributor spring?

    Can you post a picture of your carburetor with the flame arrestor removed? Does this boat stay in the water? If so, how clean is the bottom?
  17. K

    Dribble of oil at prop, usual suspects checked, now puzzled

    Look inside the lower seal cavity in the upper unit with about 10 lbs of pressure. You can close off the transfer oil hole with a tapered wood dowel .Quite often the surface of the lower gear is pitted. If so then you will have to break it down and install a “Speedy Sleeve” over the pitted...
  18. K

    Shifting system

    It appears the shift interrupter is not engaging. Are the wires still connected? With the engine running try pushing on the lever where the roller sits in the “V” notch.
  19. K

    Can’t get on plane

    In regards to the tank also be sure to remove the suction tube internal filter. It is a conical shaped fine mesh filter. There is a very good chance that it can also cause starvation problems. You really need to have the carburetor looked at also.
  20. K

    High compression in 1 cylinder - 7.4 carb

    You need to read up on the procedure for breaking in the new cam and the zink rich oil that is needed otherwise you will be replacing the cam again.
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