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  1. Scott06

    Sea Ray with MerCruiser MCM 4.3LX coupler temperature

    Were you able to check alignment after the coupler blew? 99 % of the time if the alignment is good and there is no engine sagging due to transom or stringer rot, the coupler will last the life of the boat if greased. I assume it is a somewhat older boat being a 4.3 LX ? might be worth...
  2. Scott06

    Where is the idle mix adjustment on this carb on a 5.7 350 with Thunderbolt IV?

    Common man that can go another couple years... Neighbors boat (VP 4.3 MPI) was lacking in holeshot, she asked me to take a look at it. Had just had the marina that did winterization do a tune up... cap, rotor plugs and wires ... The flame arrestor made this one look clean - completely covered...
  3. Scott06

    Where is the idle mix adjustment on this carb on a 5.7 350 with Thunderbolt IV?

    here is maybe not the best video but shows where the hidden idle m,ix screws are and flex tool needed to adjust
  4. Scott06

    1994 Mercrusier 4.3l engine compatability

    if the 4.3 is out of a truck leave the cam alone. What is your current carb? 2 bbl or 4 bbl? Likely jetting would need to be changed for the vortec heads. If yo have a 2 bbl not a bad time to upgrade to 4 bbl. Your current exhaust manifolds will work but I would be surprised if they aren't...
  5. Scott06

    1994 Mercrusier 4.3l engine compatability

    The 96 and up use vortec heads with an 8 bolt intake. This will provide more power vs the earlier 12 bolt intake heads. Also later blocks will require use of an electric fuel pump. thee are no such thing as marine heads. They are the same as truck heads. Only diff between truck and marine is...
  6. Scott06

    Sea Ray with MerCruiser MCM 4.3LX coupler temperature

    Never checked coupler temp but being on back of engine next to the exhaust I’d say 140 f / 60 c is fine if you have relatively even witness marks in the grease don’t worry about it. When I did my repower I could not get the grease marks perfect, spent a bunch of time back and forth …. drive...
  7. Scott06

    4.3 No Power and No Ignition Advance

    Not only proper cleaning of carb with quality rebuild kit but also make sure fuel system is clean antisiphon valve is working etc. i have found an inexpensive harbor freight ultrasonic cleaner improved my success rebuilding carbs. Pretty amazing what it gets out of a relatively clean looking...
  8. Scott06

    5.0 carb on 4.3

    Mikes is very good and probably can get you the correct jets for a qjet but Cliffs is the guy for q jets- would think he can tell you what jets and step up rods to use for a 4.3 https://cliffshighperformance.com/
  9. Scott06

    Merccarb 2 barrel rebuild

    When I replaced my float I basically eyeballed where it would be on the float when switching to brass vs the dots. If I recall the seam on it is roughly parallel to the lid. You may want to consider getting a ultrasonic cleaner from Harbor Freight- using one has improved my carb rebuild...
  10. Scott06

    350 mpi rebuild questions

    then option 2 your shop prefers with this gasket will get you to the factory quench https://www.summitracing.com/parts/mah-5776?rrec=true I know every one wets their pants over the correct .035 quench but the OEM quench will work just fine for what you are doing
  11. Scott06

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

    No grinder and cutoff wheel? could do it with a sledge hammer/BFH I think just to see wall thickness is not driving this. Drink a few beers then get the BFH going....
  12. Scott06

    Water in Oil

    He pressure tested it so gasket or rot should have shown up then
  13. Scott06

    Water in Oil

    You could try a 160 stat in it if you dont have too much scale in the water. My old 3.0 used a 140 stat, current boat (2004 5.0) came with a 160 stat, no issues with scale
  14. Scott06

    350 mpi rebuild questions

    What is quench with stock set up? I know .035 is ideal quench but don’t what it is from factory. option 2 if thinner head gasket for better quench but again don’t know what stock is
  15. Scott06

    opinions....

    Then that is big red flag as other have mentioned..
  16. Scott06

    Boat Lift Question

    Canteleve lift only has cable pulling up the front
  17. Scott06

    opinions....

    Can t tell if that is caulking or if that is the FAO they are supposed to leave between the outdrive and bottom paint
  18. Scott06

    Mercruiser 5.0 misfire and stalling NEED HELP

    Did you clean the carb or just put the needle and seat back in? If under load is power valve and plunger moving ok? Float level set correctly , clean the carb in an ultrasonic cleaner and rebuild. Have you checked under load with a timing light that it isnt missing?
  19. Scott06

    Water in Oil

    Does the engine get up to temp or run cool? If you dont get it good an hot regularly you can get milk in oil. People who let it idle at the slip to run it can get this... SO looks like you check manifold for leaks, pressure tested the cooling system and verified water is getting into PS system...
  20. Scott06

    Mercruiser 5.0 misfire and stalling NEED HELP

    I would rebuild the one you have with a quality rebuild kit like like from Mike Carb parts. If it is flooding the needle and seat/float are not working or you have too much fuel pressure
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