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    Frost Plugs

    Can't say I've had any break but it's possible. They should be stainless so hopefully not stuck with rust
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    New rebuilt OMC 3.0l Overcooling no matter what!

    Put the thermostat in a pot of water on the stove with a thermometer and check it
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    Frost Plugs

    remove the exhaust manifold. use a socket exactly the same size as outer rim of the plug or use a flat piece of steel or brass the completely covers the plug and whack on it with a hammer. a piece of hard wood might even work
  4. I

    Frost Plugs

    Core plugs are not designed to prevent damage to an engine from freezing but can pop out due to freezing or other conditions, like high pressure in the water jacket, or expansion of the block due to overheating. You can get a replacement plug or set of them from an auto parts store, just get...
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    MerCruiser 5.7L Low-ish Compression

    4 years isn't terribly long for an engine to sit. With the compression numbers you have, the valves are at least mostly sealed. There could be stuck rings as well. I personally would run it for 20 or 30 minutes at a time, varying rpms (don't get too carried away) with a few quick revs to build...
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    MerCruiser 5.7L Low-ish Compression

    Here's my 2 cents, take it for what it works. If it runs, and you don't want to invest a lot of time and money in it, run it. Do what you need to do to make it as safe and reliable as you need to ie tune up including ignition, charging, cooling and fuel and exhaust systems. Change the oil and...
  7. I

    '86 Cobra - Delay Before Impeller Sprays Out, Muffs

    The water pressure is supposed to but a lot leaks out so you have to turn it all the way up and I like to help it along. The barb/hole is supposed to let air out so it primes easily.
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    '86 Cobra - Delay Before Impeller Sprays Out, Muffs

    I always squeeze or clamp the muffs to force water up to the impeller until it starts to pump. When in the water, the impeller is submerged. Not the case running on muffs.
  9. I

    locking distributor down

    Is the bolt loosening or just not provided adequate clamping force? Is the gasket under the distributor missing or damaged?
  10. I

    Trying to reprop, but how can I tell if my engine gets to WOT?

    Drive trimmed up definitely will cause bow to rise. Do you have a trim gauge or trim senders? Calibrate them if you do
  11. I

    locking distributor down

    Has the distributor clamp been removed for any reason? They have a bend in them and won't work if upside down. Also make sure it is slid over the distributor base fully
  12. I

    Help with Caravelle 209 Volvo 5.0 PFES

    You can check the part numbers on the injectors when you take them off. They are likely GM parts than can be purchased much cheaper from an auto parts store than a boat dealer.
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    Help with Caravelle 209 Volvo 5.0 PFES

    I agree you are not getting even fuel spray from both injectors. Take apart, inspect, clean, and swap postitions to troubleshoot before throwing parts at it
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    Help with Caravelle 209 Volvo 5.0 PFES

    If you are seeing the injectors not spraying evenly, it could be a bad injector or it could be a blockage in the throttle body. Remove throttle body and injectors. Disassemble as much as you dare and thoroughly clean it. Make sure all fuel passages are open, spraying carb/throttle body cleaner...
  15. I

    OMC 5.0 no start

    What do you mean by swapped bad fuses? Did you have blown fuses? Are they all good now? Why did they blow to begin with?
  16. I

    Post for flame arrestor broke off!!!

    Can you remove the top and use the alumiweld brazing rods?
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    Trying to reprop, but how can I tell if my engine gets to WOT?

    when you move the shifter/throttle lever at the helm it moves two cables that connect to a linkage on the engine. 1 cable goes the the shift linkage that puts the drive in forward neutral or reverse. the other goes to the carburetor and opens and closes the throttle. when you push the...
  18. I

    Trying to reprop, but how can I tell if my engine gets to WOT?

    with the engine off and the cover removed, push the shifter forward until you see the linkage move and fully engage forward gear. then watch the linkage on the carburetor until you see it start moving. it should start moving very soon after the gear shift linkage is fully engaged. then continue...
  19. I

    Mercrusier 350 MAG MPI - RPM issue under a load

    The 6.2 uses the same block as the 5.7 so the original motor could have possibly been a 6.2 and you didn't know that. It would make sense if it had a 6.2 e c m. It could also explain why you can't get the 5.7 to run properly using all the components for the 6.2
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    Mercrusier 350 MAG MPI - RPM issue under a load

    Ok tell us a little bit more of the backstory. You state you have a rebuilt engine in the boat now. Completely rebuilt or short block? Did you rebuild it or buy it that way. Was it installed when you got it? Did you install it? Did you have it installed? Is it the same engine that had the 6.2...
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