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  1. Lou C

    4.3 fuel problem?

    If it’s a Rochester style carb it’s gotta be the Mercarb which is a slight modification of the old Rochester 2GV 2 bbl. I think testing for fuel pressure when it fails to start is the way to narrow this problem down. This is one reason why I’m reluctant to give up my old pre vortec 4.3. Simple &...
  2. Lou C

    Alpha 1 Gen 2 Weak Link

    Or lack of maintenance
  3. Lou C

    Volvo Penta 5.0 GL-H loss of rpm

    I would gap them to spec the ACs are fine
  4. Lou C

    Four Winns Vista 248 Bilge Fuse

    Try going on the actual Four Winns site, they may have wiring schematics, the fuse box isn't labeled? Even the old one on my '88 Horizon is labeled.
  5. Lou C

    MerCruiser 4.3 Clutch/Neutral

    The old style OMC factory controls have no button but you just pull the whole control outward and you have throttle only and can manually set fast idle. So yours is probably like that.
  6. Lou C

    Volvo Penta 5.7 gxi overheating

    Are you sure all the ports in your stat housing are open? Including the bypass? PS the impeller will never pull water from a tub . The water level would have to be nearly up to the top of the drive. You need hydrostatic pressure to fill all the passages in the drive and the full length of that...
  7. Lou C

    Volvo Penta 5.7 gxi overheating

    Good point Bruce!
  8. Lou C

    Looking for bare engine block with pistons

    With it set right and engine idle at 600 in gear in the water it should shift really easily like in and out with 2 fingers. Besides the shift system adjustment the trick is getting the throttle cable adjustment right so the engine reliably returns to idle every time….other wise it tends to drift...
  9. Lou C

    Volvo Penta 5.7 gxi overheating

    Ok now correct me if I missed something: Not overheating till you replaced impeller It will run on the flush hose and not overheat, this by passes the normal raw water intake system You put it in the water it overheats Correct? So that leaves: Impeller not pumping an adequate volume of water or...
  10. Lou C

    Parasitic Battery Drain

    You may just have to do that to flip off each one, one at a time till you find the one that eliminates the draw. Anything added on after the boat was built?
  11. Lou C

    Rotor Distributor Cap 4.3L EFI 1998

    I'd love to know whose brilliant idea that was lol.
  12. Lou C

    SWITCH FROM QJET4MV TO EDELBROCK

    The issue with QJets is Rochester quit making them in 1990 which is a long time ago, if you have an original unmolested core that was original to the boat and it’s not corroded inside it can be rebuilt to work as well as it was when new. However some vendors are selling what’s called Franken...
  13. Lou C

    SWITCH FROM QJET4MV TO EDELBROCK

    I went thru the same thing thinking that the QJet was just too old to rebuild. I tried replacing it with the exact same Holley 4160 that was used after GM quit building Qjets but I had no end of trouble with that carb even though it was brand new. I pulled out the Qjet, carefully rebuilt it and...
  14. Lou C

    Volvo Penta 5.7 gxi overheating

    Then go back to the last thing that was changed, the impeller.
  15. Lou C

    Volvo Penta 5.7 gxi overheating

    I do agree based on what you say either the impeller isn’t pumping, or water is not getting to it, or the thermostat is stuck closed. If it overheats that fast there must be no water circulation at idle. Have you verified that the engine is actually overheating? You can use an IR temp gun to...
  16. Lou C

    Volvo Penta 5.7 gxi overheating

    OK you have 2 bellows, the upper is the driveshaft bellows, there should never be water in that one, if there is it is cracked or torn and must be replaced, and you likely will have to replace the gimble bearing and maybe the u joints due to corrosion The lower one, is the exhaust bellows, that...
  17. Lou C

    Volvo Penta 5.7 gxi overheating

    Before putting it back on, you should check aligment with an alignment tool, and using the jack helps get it at exactly the right height. Engine alignment is a whole topic unto itself, once set right it usually doesn't change unless you have a boat with rot in the transom or engine mount pads...
  18. Lou C

    Volvo Penta 5.7 gxi overheating

    Yes it is DYI but the drive is heavy and if you're older it can be tough on your back to get it back on. I use a drive jack to make it easy. The upper bellows has the driveshaft and u joints inside, the lower nothing, its just to quiet the exhaust, to change the bellows the drive has to be off...
  19. Lou C

    Volvo Penta 5.7 gxi overheating

    What year and what specific drive do you have? Is it an SX or SX-A? I would try to find a document titled “Volvo Penta Overheat Diagnosis”, it is a PDF that is right from V/P and gives all the trouble shooting steps needed to narrow down the problem. Have you checked the thermostat (removed it...
  20. Lou C

    2008 4.3 ltr. TKS diesels when turning off

    I think Merc had a service bulletin on this problem, see if you can find it. I have the 4bbl Quadrajet on my 4.3 (pre-vortec) and never had dieseling even with the old cyl heads that I replaced 4 years ago. I wonder if gas is dribbling out of the main boosters or idle transfer slots as you shut...
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