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  1. Scott06

    Mercruiser 3.0 1988

    https://www.marineengine.com/parts/mercruiser-stern-drive/index.php that splash page you can put your serial number in on left side or search by engine type and year. you can buy all parts that are still available there. Not the best place to buy internal engine components but you can get...
  2. Scott06

    1985 Starcraft porpoising issue. Prop??

    The rpm numbers don’t add up as you go down in pitch wot rpm will be higher not lower unless prop is blowing out Is the tach correct Scott has pointed you correct trim up when it starts proposing trim back in or add weight to front Were these different pitches of same prop ? So not go up in...
  3. Scott06

    No Spark, feels like I’ve tried everything.

    10 dropping to 5 volts isn't going to work. Also remember that the 12v goes from engine thru engine harness, into boat harness, up to helm and back. So in addition to the battery cable (do the ground cable too) there are potential voltage loss points in the cannon plug (engine to boat harness...
  4. Scott06

    No Spark, feels like I’ve tried everything.

    I would check to see if it’s there when cranking
  5. Scott06

    No Spark, feels like I’ve tried everything.

    and the 12v you are measuring at purple wire going to coil is while cranking or at rest when ignition is on?
  6. Scott06

    Bent push rods….calling engine builders

    X2 on this one
  7. Scott06

    No Spark, feels like I’ve tried everything.

    not sure that may be why. As a sanity check is the distributor rotor turning when the engine cranks?
  8. Scott06

    No Spark, feels like I’ve tried everything.

    https://marineengines4less.com/content/EST%20Ignition%20Instructions%20-%20ME4L.pdf?srsltid=AfmBOooZQwEi1W7uouEXyz6n6IJZgyV36X7RphghERpUw9PjdbgjUyFc in these instructions they show the white wires of the timing loop being connected - not 100% sure if they are cut when putting in base mode -...
  9. Scott06

    No Spark, feels like I’ve tried everything.

    grounding the coil wire works , if the coil fires but plugs dont that is a diff issue(s) than if the coil wont fire. spark gap tester is one of the best trouble shooting tools you can have. Inexpensive and can tell the strength of the spark by how much gap it can jump. So when you get it...
  10. Scott06

    Proper positioning of U-joint bellow

    you are correct general top and general forward . yes flats at 9 and 3 When I did my bellows 2-3 years ago they were 18 year old OEM bellows and still were water tight. No sense using anything else
  11. Scott06

    No Spark, feels like I’ve tried everything.

    exactly like that and you are testing for spark off the coil or one of the plug wires?
  12. Scott06

    No Spark, feels like I’ve tried everything.

    Ok still the troubleshooting in factory manual for a 3.0 EST will tell you what isnt working, or prove you have a defective unit
  13. Scott06

    No Spark, feels like I’ve tried everything.

    I would get a hold of a factory manual for your engine and there should be a troubleshooting guide - probably the pick up coil (inside dist that triggers the spark) or the module is bad. I'll look and see if I have a copy electronically tonight
  14. Scott06

    Mercruiser 3.0 1988

    yes they are hydraulic flat tappet. the lifters are accessed behind the two panels. You can pull the rocker cover and see if there is any play in the rockers arms. They can be mal adjusted or rocker stud can pull out or nut can loosen. noise doesn't sound like that to me. I did see one time...
  15. Scott06

    Mercruiser 3.0 1988

    ok thanks. it seems to be coming from rear of engine. I would think its either in gimbal bearing , ujoints or something in flywheel area is loose and rattling or flywheel and or coupler is loose. The latter will require pulling the engine or at least lifting it so you can get the flywheel...
  16. Scott06

    Mercruiser 3.0 1988

    still not sure if the drive is up or not.... if up just trim the drive down and run it at that speed first see if the noise goes away. re the comment about timing chain - the 3.0 uses a timing gear set
  17. Scott06

    Mercruiser 3.0 1988

    Read bondo post above if outdrive is all the way up and you run above idle speed the ujoints will make noise. before you spend too much time and money if you haven’t make sure your stringers and transom are solid. would also pull the drive and inspect the bellows gimbal and ujoints, pressure...
  18. Scott06

    Mercruiser 3.0 1988

    yes needs to idle a bit lower. Not sure if something is loose inside the flywheel cover or flywheel is loose (or the metal cover on front side of flywheel cover) ? I would be inclined to pull the drive and run it ( connect water by jamming hose in bellhousing or connect to hose up from...
  19. Scott06

    Mercruiser 3.0 1988

    yes shift interrupt should not trip while out of the water and no load is on the prop. If it does usually indicative of worn shift cable or corroded linkage in bellhousing. 625-650 is a decent SWAG idle speed. Best place for info is the factory Mercruiser service manual which exact manual...
  20. Scott06

    A-team HEI distributor upgrade shift interrupter wire connection

    I belive they make marine rated or at least listed as marine...
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