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    Volvo Penta 5.7 1996 TBI Low compression and steam out of crank breathers

    Just an update here.. Got a new manifold and new risers installed. Engine runs rough at idle with hissing sound from throttle body and sometimes when RPMs brought up it starts knocking and stalls. Also fuel priming bowl gets very soft after a bit of running. Where do I test fuel pressure? I...
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    Merc 9.9 2006 won't revv up and excessive smoke

    This is 4 stoke. Im not sure if your external oil method is applicable. Plugs been cleaned. Pump is as hard as can get🤷 Wish I could send a video..
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    Volvo Penta 5.7 1996 TBI Low compression and steam out of crank breathers

    *Got it started and ran for about 10 min. Retested compression and 150 in both cylinders 🤙 I guess oil and carbon was washed out along with all the rust and thats why I had no compression. Was running rough after got warmed up, I assume cause manifold leaks water into starboard side. I got...
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    Merc 9.9 2006 won't revv up and excessive smoke

    Hey folks! I have Mercury 2006 9.9 kicker and it just won't rev up. It seems like running rich with lots smoke coming from exhaust when revved up then often dies when released throttle. So far I cleaned carburator multiple times and checked all the orifices. Replaced accelerator pump diaphragm...
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    Volvo Penta 5.7 1996 TBI Low compression and steam out of crank breathers

    Just an update.. I've soaked all the cylinders with deep creep for 5-6 days and now good cylinders have higher compression (175-180) and two bad ones dropped to around 20 and with some oil to 50. Is it because carbon was actually sealing it?🤔 Any other guesses?
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    Volvo Penta 5.7 1996 TBI Low compression and steam out of crank breathers

    Are Sierra or Chinese manifolds any good? I would prefer to do these on budget if possible. We didnt plan for extensive parts list unfortunately. Im gonna use this boat maybe 20-30 hours a year on fresh water only.
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    Volvo Penta 5.7 1996 TBI Low compression and steam out of crank breathers

    Thank you @louc. This is really comprehensive explanation. I dont know why I didnt think of stuck piston rings🤷 I've had 3.7L Mercs, Volvo AQ131 4 cyl and 351 on ski boat before but somehow got away from doing any major work. I guess its not the case now. Interesting they replaced port side...
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    Volvo Penta 5.7 1996 TBI Low compression and steam out of crank breathers

    Hello everyone! Sorry for starting a new tread.. I'm sure it has been discussed here more than a dozen times.. I just bought this boat and seller said "something wrong with starter" so I never heard it running before purchasing. After fixing wiring and then new fuel pump it runs, but first...
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