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  1. Scott06

    Mercruiser 120 poor starting

    If you are talking about an IAC or idle air control valve there isn’t one on this carbed engine
  2. Scott06

    Mercruiser 120 poor starting

    True if points haven’t been cleaned and dwell set start there
  3. Scott06

    Mercruiser 120 poor starting

    Not sure which style yours has but you can disconnect the wires to it and see if you have spark . It grounds the coil to momentarily kill the spark so the dog clutch in outdrive can unload and pop out of gear good to rule out the switch isn’t killing it
  4. Scott06

    Mercruiser 120 poor starting

    Have you ruled out the shift interrupt switch as possible spark killer?
  5. Scott06

    Help me set up my new edelbrock 1409

    I've never hooked a vacuum gauge to my boat, car for sure) I do it mostly by ear. On my 5.0 w a 1409 I find it likes it about 1.75 turns out
  6. Scott06

    Over heat alarm

    Bravoitis where it comes through the transom? Pretty common issue , pretty common solution
  7. Scott06

    Crank driven vs block mounted raw water pump pros/cons

    Would think how close the bulkhead/ Engine compartment is to the front of the crank would dictate this. If belt driven it would be behind the plane of balancer pulley
  8. Scott06

    Manifold Change

    Take the hose off the thermostat housing that brings water up from the outdrive. Should get 3-4 gpm. If not it’s from there back to outdrive. Also make sure the muffs are not impeding the water flow to the drive.
  9. Scott06

    2002 Mercruiser 3.0 - No Oil? Engine Swap?

    Then WTF did it go... I mean I haven't started drinking yet. take out the sender and hook up a mechanical gauge ($25 at autoparts store). When hot if it has 10 psi for every 1000 rpm of engine speed your bearing clearances are good. Very easy to run and engine on the ground
  10. Scott06

    2002 Mercruiser 3.0 - No Oil? Engine Swap?

    Was thinking the dipstick was broken or wrong one ... You put 5 qts in the engine (its a 4 qt motor) and there is nothing in the pan? You pulled the oil pan drain plug and there is no oil? Not sure where it would go unless it leaked out somewhere ?? Cant conceive a situation where the head wad...
  11. Scott06

    2002 Mercruiser 3.0 - No Oil? Engine Swap?

    #1 - block wouldnt crack like that from over heat only from not winterizing - also need to check if manifold is cracked as well. it is worth starting it on the hose and seeing if you get water into the oil . Sometimes will just crack externally and people slap JB weld on it and call it good...
  12. Scott06

    1990 mercruiser 4.3 no spark

    do the compression test as a sanity check other than that would think you are not on compression stroke.
  13. Scott06

    1990 mercruiser 4.3 no spark

    and you have checked the strength of spark with gap tester? basically confirm you are getting spark Was intake recently off and there is possible vacuum leak or just chasing down the no start condition ?
  14. Scott06

    Manifold Change

    I think they use a longer down turn after the elbows to match the riser which arent cheap as I looked into it a few years back. your bolts wont be long enough either so you are probably best to return and get the same size as you took out (assuming they were the correct height above waterline...
  15. Scott06

    Hotter than normal temps. I just replaced the impeller on the sterndrive, and pulled the circulator pump.

    Was the old impeller missing pieces? If so they can get caught in the system in places like power steering cooler. Otherwise wonder if hose came of transom housing or possible new impeller failed have seen some after,Arlen ones where metal core spins within impeller
  16. Scott06

    07 mercruiser 4.3 no start

    No get a volt meter and find out where you have 12 vac as outlined. Based on what you say in start you will have 12 v on positive terminal of the coil, hence the spark and running. In run you are losing it hence why it dies. It’s between the key switch and coil you are loosing 12 v . Start at...
  17. Scott06

    Choke valve position cold engine

    Typo dwell, ignition points dwell. Set dwell then timing. yes any tune up is done once it gets to operating temp. Get a factory service manual for your engine. Merc manuals have great detail on specs and procedures. If you have a modicum of mechanical knowledge a manual will help dramatically
  18. Scott06

    replace Mercruiser 2.5L 1989 with Mercruiser 3.0 1994

    that sounds right fully dressed (exhaust accessories etc) there is no real weight dif between a 2.5 and 3.0 they are essentially the same engine
  19. Scott06

    Hotter than normal temps. I just replaced the impeller on the sterndrive, and pulled the circulator pump.

    they usually last the life of the boat in fresh water. have never changed one even on 30 yr old boats. replace it if you want but that is not your issue here
  20. Scott06

    Hotter than normal temps. I just replaced the impeller on the sterndrive, and pulled the circulator pump.

    you probably were missing adequate water supply from the hose circ pump looks fine did you verify the gauge is accurate
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