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  1. Scott06

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

    Absolutely can’t figure it either.
  2. 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
  3. 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...
  4. 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...
  5. 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...
  6. 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
  7. 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...
  8. 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
  9. Scott06

    What does HEI / D.U.I. replace

    good catch - run a 12 v jumper to coil see if the issue goes away.
  10. 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 ?
  11. 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...
  12. Scott06

    Mercruiser 7.4 Carburetor 9777s needs repair kit

    I think yes but might be worth a email to edlebrock to confirm.
  13. Scott06

    Mercruiser 7.4 Carburetor 9777s needs repair kit

    Also can go to mikes carb parts for a kit floats etc
  14. Scott06

    Should I redo the pink RV antifreeze that I already used last week to winterize Merc 5.0?

    Raw water hose on yours is the 1.25” diameter hose that comes along the intake to the rh side of thermostat housing. If you follow it back behind the distributor the ps cooler is on the back of the block/ flywheel cover . mine never holds water what i do is pull the hose off the thermostat...
  15. Scott06

    I got a boat...help needed!

    First what are you working on year and engine or better yet serial number off the engine. Did you test the boat out before you bought it? You need to determine if you are getting spark, getting gas, and have compression. Do a compression test before you waste a bunch of time trying other...
  16. Scott06

    Mercury Demand, Demand Linear, Demand Guardian

    That is pretty impressive. Does it alter the trim based on conditions that day or what it was set to for WOT?
  17. Scott06

    I/O (Sterndrive) Conversion to Outboards

    Your brothers old boat had the 4.5/250 hp correct ? How did that do in a 20-21 ft boat . My current boat is 21 ft with a 5.0 with 4 bbl edlebrock on paper 260 hp… like the size but when I have 8 ppl one of which is one the rope wondering if 4.5/250 hp cuts it
  18. Scott06

    I/O (Sterndrive) Conversion to Outboards

    Never bought one either for the same reason, just using it as an indicator of reapair costs
  19. Scott06

    I/O (Sterndrive) Conversion to Outboards

    on larger boat like yours I could give up swim deck space because there is more seating/lounging area. On a 21 ft the swim deck is prime real estate. All of it is a far cry from the old days - I remember stepping on the outdrive to get back in out neighbors boat (1969 Starcraft IO- 18 ft) didnt...
  20. Scott06

    I/O (Sterndrive) Conversion to Outboards

    Much smaller boats that I have had, but I have been very happy with the two Sea Rays we have had over the last 30 years- 1991 170 BR, and currently 2004 200 sport. On the 04 I had the first non-human stupidity induced fabric tears on back bench. Gel coat still looks good with occasional buff and...
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