turbo problem, high MP and popping when power at idle

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  • #84016

    Hi,

    I am hoping someone has seen something like this before and might be able to shed some like on my specific turbo symptom. Basically, when I fire up my left engine, it immediately wants to run fast, much more than the line guys at the FBO would like. If I pull back to close, the engine dies, after popping and sputtering… when this starts to happen I open the throttle back up, and things are ok, but that is 25″ MP and nearly 2000 rpm. (this is a 1969 T310-P)

    At full power things are fine… at 6,000 MSL I start seeing power reduction, like the left turbo isn’t working… I lose about .5″ of MP for every 1k feet above 6000.

    I tried alt air, which made no difference. I also tried leaning during taxi to see if I could get the engine to idle normally, which made no difference.

    I am attaching a photo of the gauges during taxi at “minimum” idle. Once the engine shuts down, the MP stays high (and I am at sea level.)

    Ideas?

    thanks!

    Graham Street
    N5765m
    Atlanta Ga


    Attachments:

    #97675
    quote GSTREET:

    Hi,

    I am hoping someone has seen something like this before and might be able to shed some like on my specific turbo symptom. Basically, when I fire up my left engine, it immediately wants to run fast, much more than the line guys at the FBO would like. If I pull back to close, the engine dies, after popping and sputtering… when this starts to happen I open the throttle back up, and things are ok, but that is 25″ MP and nearly 2000 rpm. (this is a 1969 T310-P)

    At full power things are fine… at 6,000 MSL I start seeing power reduction, like the left turbo isn’t working… I lose about .5″ of MP for every 1k feet above 6000.

    I tried alt air, which made no difference. I also tried leaning during taxi to see if I could get the engine to idle normally, which made no difference.

    I am attaching a photo of the gauges during taxi at “minimum” idle. Once the engine shuts down, the MP stays high (and I am at sea level.)

    Ideas?

    thanks!

    Graham Street
    N5765m
    Atlanta Ga

    To me it sounds like your waste gate is stuck partially open (or has a limited range of travel). Or perhaps a similar issue with the fuel/air controller. I would check the wastegate first. you can move it thru it’s range of travel on the ground with a tool. Also, mouse milk oil on the wastegate butterfly shaft helps too. You can compare motion left vs right engine.

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