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  • Re: EXHAUST MANIFOLD ISSUE

    by » 9 years ago


    Well Gentleman, The issue still there 3400RPM-and I got me 4800RPM when I awitched the carburator feed lines,and that only for a couple minutes,
    I do have am auxilary electric fuel pump and when activated nothing happen just an increase on the fuel presure from 3 to 6Lbs,
    I have changed the plunger type primer with primer bulb while ago as the plunger was leaking fuel any time I activate the Electric fuel pump,
    There was some bubles on the line that was coming from the cock pit shut off valve, there was also bubles on the bulb primer just befor the carburator's line, which I flush them all ou,
    But stil same problem 3400 RPM,
    I don't think I have any problem with the sending unit of the EGT sensor as it still reads 130 on the cylinder that is not runing and up to 800 on the one that is running when I turn on the motor for a minute or 2.
    Any more duggestions???
    Reagards
    Yanis

  • Re: EXHAUST MANIFOLD ISSUE

    by » 9 years ago


    Also carburator floats are floating, fuel level normal and main jet orofice clear on both curbs.
    Yanis

  • Re: EXHAUST MANIFOLD ISSUE

    by » 9 years ago


    Yanis,

    Sorry the easy fixes didn't work.

    Sounds like the Ignition circuits are OK. Check the compression on both cylinders. they should be nearly the same. If the compression in one cylinder is much lower than the other, You could have stuck rings, burned piston, or other things wrong in that cylinder. It's not likely a bearing. When they go, it's usually terribly obvious. Compression should be somewhere between 110 psi and 140 psi. The important thing is that they are about the same.

    The fact that it all started so suddenly still makes me think it might be a carb. It takes a little work, but if you switch positions with the carbs and one is bad, the dead cylinder will follow the bad carb. Just take the top off the carbs and pull out the slides, Pull the fuel lines off and reverse the carb bodies. then put the slides and fuel lines back in the reversed bodies. If the dead cylinder has changed positions, you know its the carb.

    Are you using the chokes on the carbs? If so it could be that. They are not really chokes, but enrichener circuits. If one is stuck open, it could be flooding the carb. (some use them, some don't. Mine were disconnected and I just used the primer)

    1. check the compression, if thats OK:

    2. reverse the carbs. If the problem moves with the carb, a carb teardown and complete inspection and cleaning is in order.

    If the compression is too low, you can pull the exhaust manifold off and inspect the cylinder wall and the rings. Look for scoring and aluminum deposits on the walls. It's hard to see the ring clearance but if you put oil on your finger and rub it on the exposed rings, you can see the oil squeezing in and out of the rings as you move the piston slightly up and down. This usually indicates that they are not stuck.

    I'm still hoping its a carb problem

    Bill.

  • Re: EXHAUST MANIFOLD ISSUE

    by » 9 years ago


    Thank you Bill, I trealy do apreciate your input, I have a friend coming tomorrow to assist he got some experties, I print out your last advices and will go through,
    I will report as soon as I got some news (hope good ones)
    Regards to all
    Yanis

  • Re: EXHAUST MANIFOLD ISSUE

    by » 9 years ago


    Yanis,

    One other quick and easy thing to check is the head gasket. Look in the radiator and see if you have any oil floating on the water. Also check the plugs and see if there is any water on the plugs in the dead cylinder. Head gaskets rarely go bad but if they do, they are easy to replace. It's not really a gasket, but a rubber O ring.

    Bill.

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