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  1. K

    Omc outdrive knocking noise while cruising.

    This looks like it would work. I closed my shop in 03 so while I still work on some old customer’s boats this fix was not available back then.
  2. K

    Omc outdrive knocking noise while cruising.

    In the Sierra catalog where OMC ignitions and distributors are listed the Petronics system states that it is not compatable with electronic shift assist. you would have to get a Mallory or a Petronics breaker point distributor. If it comes to that for your boat I prefer the Mallory point...
  3. K

    Omc outdrive knocking noise while cruising.

    I do not think there is a Petronics that will interface with your current ignition. I myself have often thought how to add the Mercruiser shift interrupt to the OMC shift setup. That would eliminate the OMC system which I have never cared for. Your problem is definitely shift dog related. I...
  4. K

    Spark plugs and cap replacement interval

    My old trade school Prof cautioned us about wearing rings and also bracelets or wrist watches. He told us that there is a nerve in the wrist that if it got burned from a battery can cause the loss of use of the hand.
  5. K

    Omc outdrive knocking noise while cruising.

    I replaced the gear set under warranty several times with the under cut gears which cured the problem. Without the shimming tools replacing the gear set is a dice roll. Also the threaded shift rod has to be exactly the same height. Before you do anything with the lower removed screw the...
  6. K

    Broken Forward Gear? Cause?

    You probably have a drive that has the preload button on the top of the vertical shaft. There is a spring under the button that is supposed to keep the pinion gear in place. This worked until the horsepower started going over 200. Drop the lower and if this is the case go ahead and get a new...
  7. K

    Mercruiser 3.7/470 Overheat Problem

    The head comes off pretty easy, however there are some bolts under the intake manifold going into the head which cannot be seen from the top. Also be sure to tell the machine shop to replace the air injection plugs in the front and rear of the head.
  8. K

    Mercruiser 3.7/470 Overheat Problem

    You still should pull the head. There are 2 types of 470 head gaskets, the ones that are leaking and the ones that haven’t started leaking yet.
  9. K

    5.0GXi Starter Replacement

    You may need new bolts for the PMGR. Well worth the effort as they also draw less current than the original heavy Delco.
  10. K

    1987 Merc 180 (“470” 3.7 litre) won’t idle

    That wire is being fed by the ignition switch in the “run” mode. After the engine starts the “bypass” circuit is no longer feeding 12 volts to the coil. The voltage at the coil is now provided by the ignition switch. Since the purple/yellow wire is connected to the + or Bat side of the coil...
  11. K

    1976 888 (MC-1) Trim/Tilt pump/line leak

    You can match up the “O” rings at any auto/hardware store. Be sure to put a straight edge across the mounting holes on the mating surface. You will see the plate is bowed, so just take a file or run it over a belt sander to flatten it out. Stick the “O” rings to the bottom of the pump with...
  12. K

    torque or angle torque

    All the big box auto stores have them.
  13. K

    Flywheel housing for 280 outdrive and newer 5.7

    If the hole is not drilled do not panic. I have drilled and tapped the extra inboard hole. With the engine on a stand flip it over, mount the 2 bolt starter using the outboard hole tightly so it will not move. Square up the starter lining it up with the rear block surface. With a piece of...
  14. K

    1987 Merc 180 (“470” 3.7 litre) won’t idle

    A compression test should be done on the engine in question.
  15. K

    Mercruiser 3.7/470 Overheat Problem

    There is 1 other thing you need to check. With the engine running on a flushout or in the water remove the hose from the drive pump and try to stop the flow with your hand. You should not be able to, If you can stop it then the plastic water pocket cover in the upper section of the drive shaft...
  16. K

    Mercruiser 3.7/470 Overheat Problem

    You have a head gasket leak. What you are describing is a common problem. Have a valve job done and get the head resurfaced. You will never see where the gasket is leaking. The cylinders have no lateral support and over time they tend to “walk” from side to side. I guaranty changing the head...
  17. K

    Mercruiser 165 6cyl inline dies when boat is in the water

    In that case try the 6 gallon outboard method. This is a tried and true way to locate fuel problems, or rule it out.
  18. K

    Timing mod: running or not running engine

    For me to keep from having to turn on & off the water & jumping in and out the boat I also set the dwell like SD. I then attach the spark plugs to the wires and leave them grounded on the manifold, spin the engine to set the timing.
  19. K

    Mercruiser 165 6cyl inline dies when boat is in the water

    In post#4 you said that with an electric fuel pump the engine runs. Am I wrong the way I am interpreting that? Have you ever tried by passing the tank by using an outboard tank directly to the fuel pump with the primer bulb? If your engine is running out of fuel you may have a crack in the...
  20. K

    Mercruiser 3.0 won't "lock in"

    If the splines completely went away there has to be a alignment problem. sierra #18-2321 looks like the coupler that you need Mercruiser # 12632A6 sierra#18-4442 alinement tool. Every Mercruiser owner needs this.
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