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  1. Scott06

    New 5.7l Vortec safety oil pressure switch for electric fuel pump issues.

    You are losing voltage during cranking or have a weak battery - by removing yellow res from the key you are removing the load, something down stream of this point is losing voltage during cranking. If youy just replaced the starter and cable double check the connection on the big starter lug is...
  2. Scott06

    New Mercruiser 5.7 with oil/water mixing

    It seemed tlike this is what he was talking about. Its a compolete remanufactured bobtail from Merc and yes it does have a 4 bbl carb. None of the reman engines use the 2 bbl for some reason. https://www.michiganmotorz.com/5-7l-complete-engine-package-357-magnum-alpha-4v-mercruiser-applications
  3. Scott06

    New Mercruiser 5.7 with oil/water mixing

    Looks like manifolds replaced last summer when he dropped in a complete motor.
  4. Scott06

    New Mercruiser 5.7 with oil/water mixing

    How did u winterize? I would be worried for a cracked block intake water crossover, or exhaust manifolds
  5. Scott06

    engine replacement ?

    I think the flywheel change is 85 and earlier, this is related to switch from to piece to one piece rear main seal
  6. Scott06

    Out drive oil

    I also had an older gen one , issue you run into is if you have an input shaft leaking oil into the bellow you would never know And your upper will be running dry. just fill it with the lube pump to the top plug, then put the plug in and keep pumping until the oil is seen in the reservoir . This...
  7. Scott06

    Serial Number Help

    I dont know where the SN will be on a 3.0 but usually there is a mercruiser tag riveted to the flywheel cover area of the block, a tag on the flam arrestor cover, and if the original owenrs manual etc is in there there is usually a mercruiser book that came with the power package that I think...
  8. Scott06

    1993 MerCruiser 4.3L V6 RAN OUT OF OIL

    If you lost oil pressure and now with oil have a knock I'd pull it and inspect bearings etc. Even if it was by change a lifter or cam issue as suggested there is still likely metal in the engine that needs to be cleaned out.
  9. Scott06

    not shifting into forward gear

    in layman‘s terms a big F’ing piece of wood that will mess up your boat if you hit it. lumber used for floor joists in typical US construction,40 mmx 215 mm x 4 m long...
  10. Scott06

    Exhaust Bellows

    Yes a bunch of people on the stern or swim platform would increase the risk. I think this is built into the calulation from mercruiser, but I did notice on my boat (2004 Sea Ray 200) that Sea Ray adds a couple extra inches to the clearnace. They use no riser on this boat with a 4.3, but the 5.0...
  11. Scott06

    What is the effect of decreasing Prop diameter?

    The mirage is a fairly big prop and yes will drop yiur rpms compared to the black max type aluminum. it will fit the alpha drive. Prop selction requires a lot of trials.
  12. Scott06

    Need a new block!!! 1990 fourwinns 4.3

    This should run through what years are interchangeable. you may want to consider getting a newer vortec long block either as a reman complete base engine or from a truck at a wrecking yard https://forums.iboats.com/threads/complete-history-of-the-4-3-liter-with-casting-numbers.693935/
  13. Scott06

    4.3l MerCruiser sluggish performance

    check the fuel filter contents for any thing but clean gas . Verify fuel pressure what do your spark plugs look like ? My guess would be rebuild carb, ensure ignition components are good, set timing
  14. Scott06

    Exhaust Bellows

    https://www.perfprotech.com/blog/articles/marine-exhaust-riser-height shows a diagram remember the exhaust goes up then does a series of 90s above the water line
  15. Scott06

    Exhaust Bellows

    The height of the exhaust riser and elbows above the water line. Typically the boat manufacturer will install an engine such that there is 14-15” from water line to top of the exhaust elbows . This height difference keeps water from backflowing into engine... but it can happen in certain situations
  16. Scott06

    1985 Chris craft inboard no spark

    Check for 12 v at positive side of coil while cranking Look at the kill switch disconnect shift interrupt switch verify that it isn't killing the ignition
  17. Scott06

    Need instructions how to remove merc 2000 3.0 L Engine from Boat

    Loosen the Bolts first to make sure you dont break one in the rear transom mounts or have a rotten front stringer where those lags go in. if yiu are trying to go in and out in one day you want to be ahead of any issues
  18. Scott06

    Trim hose to pump

    My thoughts as well or find a hydraulic or forklift repair shop can probably set you up with the right fittings or put new fittings on your hoses.
  19. Scott06

    Possibly Purchasing 70s Mercruiser 140... Overheated

    Very true, even if the engine/drive was newer and the interior was redone, its a 40 year old boat
  20. Scott06

    Possibly Purchasing 70s Mercruiser 140... Overheated

    Would agree with other comments that a 140 merc is a reliable engine parts available and cheap, also agree a 29 ft pontoon and a 140 you aren't going anywhere fast... it will be underpowered. Doesnt mean it cant provide fun I just think you wont be skiing behind it. Bigger issue is a water pump...
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