Search results

  1. I

    Swapping 88' 454 Truck Engine to Replace 93' Mercruiser 454

    I agree with Scott. Just helped a buddy swap a Mark IV in place of a Gen VI. A lot of the bolt holes were different sizes, and sensors had to be relocated as well. A lot more work that wasn't worth it in my opinion
  2. I

    Stalling at headway

    More info, please. Engine serial # if possible. 2 or 4 barrel? What year? What maintenance has been done.
  3. I

    5.7L rebuild and upgrade to vortec heads

    As Scott said it's just heads and intake. Get a set from the junkyard and go through them yourself or have a machine shop do it. You'll likely find pitted exhaust valves that will need replacement but you might be able to lap them smooth. Machine or lap them flat and put in new valve seals. If...
  4. I

    Stalling at headway

    Carb or tbi or mpi?
  5. I

    Mercrusier 350 MAG MPI - RPM issue under a load

    I was just wondering if it read voltage or TPS%. Trying to isolate variables. Thanks
  6. I

    Mercrusier 350 MAG MPI - RPM issue under a load

    Your pic shows throttle position sensor at 0% but throttle position voltage at 0.6V TPS should read some % at idle I would think. Does the ECM use TPS voltage or position? Did you get a chance to check TPS reading at different throttle amounts?
  7. I

    Rebuilt 5.7 vortec wil not turn over

    Do you still have the old starter? If it still worked you could put it on and try it. Might be a bad new starter. Or take the starter in and have it tested
  8. I

    Mystery Bolt!?

    I'm guessing it's a 3/8-16 bolt which could be a number of things from front accessory to motor mounts to flywheel housing. Take a look around and see if anything is missing. If you're worried about it take it back to the shop and have them check. If you have evidence of poor workmanship, it's a...
  9. I

    1998 Mercruiser 5.0 Intake manifold gasket mismatch issues

    You might not want to do it but if you pull the intake off the other motor and compare the fit, it would let you know if there is a casting defect in one or both manifolds.
  10. I

    1998 Mercruiser 5.0 Intake manifold gasket mismatch issues

    I don't think the silicone molded into the gasket is needed for the intake port dividers but there does appear to be an issue with the manifold casting on the edge of the runner. It might be a casting defect. Is it OEM or aftermarket? Probably need to replace the intake. I have used inexpensive...
  11. I

    new 5.7 vortec parts

    If original motor had 1 piece rear main seal, old oil pan should fit just fine. 1985 was when these came out. Maybe a year or two later. 1988 should be a match
  12. I

    Help! 2nd Fuel Line Failure

    You either have low quality fuel lines, too much pressure, or it is bent sharply causing strain
  13. I

    Lubricating throttle/shift cables

    The cables are pre-lubed and not designed to have lubricant added. If you were able to add any lubricant it would be a minimal amount and likely not help anything for any appreciable length of time
  14. I

    2012 Mercruiser 4.3 MPI fuel system problem/wiring diagram

    Please start your own thread. This thread is 5 years old
  15. I

    Gear Ratio?

    It should be on the tag on the Sterndrive
  16. I

    OMC cobra outdrive drops out of gear

    It it was a spun prop you likely wouldn't ne able to get up on plane at all. With load on the gears it shouldn't come out of gear but it might be your dog clutch is rounded off or barely engaged. With the engine off and engine cover removed, put it into gear watching the shift cables on...
  17. I

    27ft Boat Prop recomendation

    And what is the gear ratio?
  18. I

    27ft Boat Prop recomendation

    What were the previous props?
  19. I

    Thermostat location on 2020 Volvo Penta 4.3L V6 280HP I/O Forward Drive

    pictures look like it's on port side directly in front of valve cover
  20. I

    Thermostat location on 2020 Volvo Penta 4.3L V6 280HP I/O Forward Drive

    I can't answer that but perhaps it's in a similar location as the automotive applications. Perhaps look up 4.3 direct injection or lv3 thermostat location
Top