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  1. Scott06

    Affordable fuel injection intriguing

    Id look closely before laying down the cash. On the hit rod forums you see a lot of quality issues in terms of component of reliability on these systems be it sniper , fitech, etc. not sure if any of the aftermarket system are OEM fuel injection quality like you see in automotive OEM systems...
  2. Scott06

    4.3 vortec Mercruiser..lots of questions

    No you just need compressed air. Basically you block off the cooling system hoses T in an air line quick disconnect and pressure gauge , put 15 psi in and it should hold indefinitely . Since the PO wasnt that bright would just verify before you get too excited.
  3. Scott06

    4.3 vortec Mercruiser..lots of questions

    yeah sounds like you are cleaning up after a idiot... If it were mine I would pressure test cooling system, do a cold compression test, and look in cylinders with bore scope before dropping time and money into it
  4. Scott06

    4.3 vortec Mercruiser..lots of questions

    Did water get down the intake into the engine combustion chambers? Look for signs of freeze damage if you are in a northern climate. If not winterized you will typically see freeze cracks on exhaust manifolds, outside of block by oil pan rail, and in lifter valley. Might be worth pressure...
  5. Scott06

    2002 5,7 Mercruiser exhaust manifold keeps cracking - 5 times this summer

    For a sanity check have you cut the cracked manifold in half to see if the wall thickness ok. Would find it odd from two manufacturers you would get this many bad manifolds but might be worth checking out before you drive yourself nuts...
  6. Scott06

    Outdrive failure?

    Buying used would be nice to see what comes out with the gear lube- water / metal pieces vs clean gear lube. Would pop the top cap see what it looks like, and should pass a pressure test. Look on the side of your current drive ratio should be stamped in it if not legible yes count teeth in...
  7. Scott06

    Very difficult to shift into Neutral

    Ok misread it but it means the same thing (nothing). Totally different out of vs in the water. Yes get your idle speed down. Not sure how it is running so nice if it wont idle at proper idle speed.... did you adjust the idle mix when you got it running? If you keep track of how many turns you...
  8. Scott06

    Very difficult to shift into Neutral

    with no propeller on the water doesn't mean anything. the load of the propeller with the back cut angle on the dog clutch teeth is what holds it in gear. Same as how you lock it in fwd by holding the prop CCW with a bungee on land... same as water pushing against prop blade... the too high idle...
  9. Scott06

    No fuel at rail with KO/EO merc 350 mag mpi tow sport (02 centurion)

    Serial number will get you there marine engine and mercruiser parts.com among other have it via serial
  10. Scott06

    2002 5,7 Mercruiser exhaust manifold keeps cracking - 5 times this summer

    Absolutely can’t figure it either.
  11. Scott06

    No fuel at rail with KO/EO merc 350 mag mpi tow sport (02 centurion)

    Do you order by engine serial number? https://www.marineengine.com/parts/mercruiser-stern-drive/index.php
  12. Scott06

    Carburetor switch

    yeah usually although they are he same carb things like the venturi cluster primary jets and power valve are different sizes for different engines... so it might work or may not work well at all. One other potential hiccup willing to bet the choke on the 1970 carb is heated off the exhaust vs...
  13. Scott06

    Old Mercruiser 120 3000rpms WOT rated for 3900-4300

    if you are getting spark I would leave it alone for now. People switch out point for electronic to avoid filing the points, setting dwell, and setting timing annually. At this point I would use your neighbors timing light to make sure timing is set correctly and you are getting the correct...
  14. Scott06

    What does HEI / D.U.I. replace

    ok you have a factory fuel pump then. your issue is loosing volts between the key and the coil. On some boats the purple wire when it leaves the key can daisy chain through the gauges which is dumb from a loose connection/corroded connection standpoint. then it goes through the man...
  15. Scott06

    2002 5,7 Mercruiser exhaust manifold keeps cracking - 5 times this summer

    Yeah was thinking if there is air being sucked in either on inlet side of water pump (supply to engine) or if say a head gasket is putting combustion gasses into the cooling and it is allowing that manifold to get hot
  16. Scott06

    What does HEI / D.U.I. replace

    not sure if that originally had a mechanical or was Gen II engine that came with an electric pump from the factory. the LX from 88-92 used a mechanical pump from factory. The LX 92 and up used an electric pump... Being a cross over year could be either way. the factory wiring for electric fuel...
  17. Scott06

    What does HEI / D.U.I. replace

    what engine are you working on (model preferably serial number)? fuel pump should not be wired straight to key, as if you leave the ignition on by mistake fuel pump will be running
  18. Scott06

    What does HEI / D.U.I. replace

    good catch - run a 12 v jumper to coil see if the issue goes away.
  19. Scott06

    2002 5,7 Mercruiser exhaust manifold keeps cracking - 5 times this summer

    Have you put a section of clear hose in water into engine line to look for bubbles ?
  20. Scott06

    What does HEI / D.U.I. replace

    Yes the DUI has the coil in the dist cap top and the module is inside the dist. DUI is based off GMs HEI that is similar all in one dist another way to do is the Delco EST. The Est is more common In marine applications and is used as OEM on some mercruiser and volvo penta engines. Main diff is...
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