Search results

  1. Scott06

    Carb tuning

    one or both throttle plates may be upside down and not closing. Are you setting idle speed with the throttle cable disconnected? Are the throttle blades exposing the transfer slot? This could add fuel that the mix screw will not control. normally this is seen on hot rod engines with big cams...
  2. Scott06

    Mercruiser 3.0L choke adjustment

    The mercarb is a descendant of the rochester 2 jet so yes uses a vacuum piston in the choke element housing. Very similar to the holley electric chokes
  3. Scott06

    Carb tuning

    I found the same thing with the base gasket. Your edlebrock has the same square and spread bore mounting that my intake does. There is very little sealing surface in a couple spots on the secondary side with webber/eddy carbs. I found this when installing a phenolic insulating spacer. The...
  4. Scott06

    Started out as a good day on the water. 4.3 mercruiser

    The TB module is either mounted to the dist or on the exhaust elbow. Both are black boxes, sometimes with a knock module. just google 4.3 delco est. there are original Delco units and aftermarket knock offs. Sierra has units that are considered good. if I was in your shoes I would look for a...
  5. Scott06

    Mercruiser 3.0L choke adjustment

    choke pull off on a mercarb is inside the choke element housing. Its a piston behind the element vs a separate diaphragm with hose like a qjet or divorced choke to the op this like shows the adjustment of the choke by bending the linkage
  6. Scott06

    Mercruiser 3.0L choke adjustment

    you may need to bend the linkage to get it to the correct opening amount not just adjust the element which is more for the amount of time it stays closed. Did they properly set the idle mix and speed ? In warm weather it should really not need much choke anyways if properly set up.
  7. Scott06

    Started out as a good day on the water. 4.3 mercruiser

    It seems to be hit or miss with the est modules , also finding an actual delco est is not as easy anymore. Mich Motorz no longer carries actual Delco for the 4.3 and 5.7, only the 3.0. When I bought my repower partial engine from them in 2015 they normally supply them with the EST. I had them...
  8. Scott06

    Started out as a good day on the water. 4.3 mercruiser

    friggin auto correct... I meant the Merc TB (thunderbolt) is a great system, Merc just screws the owner by NLA or insane ignition module prices... so when the module dies a actual Delco Est (not cheap knock offs) is a good relatively drop in replacement. Yes the trigger sensor is not a bad...
  9. Scott06

    Started out as a good day on the water. 4.3 mercruiser

    Why would you replace the ignition system if it’s working? The atB is a great system until the ignition module needs to be replaced $$$. Then typical replacement is a delco est. this isn’t any better except module rEllacement cost. Both are OEM quality systems.
  10. Scott06

    1981 120 mercruiser rough idle

    not that it matters but the Iron Duke engine is a 151 CID Pontiac engine from the 80's, the marine 2.5 are Chevy based 153 CID engines that debuted in the chevy II in 1962, which was later made into the 3.0 marine and industrial engine. Good news is if you do need a new engine you could swap...
  11. Scott06

    Tinkering on the 4.3l this winter...

    25 would make sense as the 4.3 2 bbl is rated at 190 hp, the reman 4.3 with 4 bbl webber eddy is rated 225. I had heard somewhere on here that it takes 10 hp per 1 mph but can only assume the hull has something to say about it. I found the midrange throttle response on the 4 bbl to be way...
  12. Scott06

    I/O (Sterndrive) Conversion to Outboards

    A lot of tire kickers? I just went through selling on of our cars on marketplace, older vehicle for not much money, go so sick of it I gave it to a friends son who just totaled his car on a deer.
  13. Scott06

    3.0L mercruiser compression

    worth doing as in dash tachs tend to drift over time. if its off you may be hitting correct WOT rpm already.
  14. Scott06

    3.0L mercruiser compression

    Again find a different mechanic. Ask them to show you the published compression numbers in the mercruiser manual, it’s 150 psi… please do not spend any more money with these guys have they verified your tach against a shop tach ?
  15. Scott06

    3.0L mercruiser compression

    100% 150 is new , get a different mechanic. 3.0 is a great motor for economy of ownership and reliability, not speed. Yes you should be able to get it to 4600-4800 rpm but that is probably prop related. When I had a 3.0 I ran a 16” prop for skiing etc , may need to drop in pitch.
  16. Scott06

    Valve Lubricant

    Looks like lead substitute they recommended when leaded went away , decades ago… that part number and the superseded part numbers are NLA. A1996 will have hardened valve seats from the factory so not sure if you are using the correct manual for your engine
  17. Scott06

    2005 Mercruiser 5.0L MPI (bravo 3) suddenly started overheating

    my merc with raw water cooling (160 thermostat) generally indicates 170 on the gauge as well.
  18. Scott06

    MCM 7.4 oil

    was thinking bearing clearances.
  19. Scott06

    outdrive question

    Agreed hold it on with a rope or bungee.
  20. Scott06

    Dark colored drive shaft and black looking grease

    I usually use Lucas red N Tacky and it always comes out black. The grease you are using now may not be the same formulation despite the product being the same label, also yo may have gotten more hours in. As long as the alignment is good and keep it greased it will last decades.
Top