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Thread: M135 Engine Power Issue

  1. #11
    Colonel DUUANE's Avatar
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    These 302's are governed are they not? Could there be an issue there? Im not too familliar with them other than they are vaccuum operated/related..torn diaphram or broken spring allowing it to close early? I usually disconnect them or remove all together as i can drive and watch a tach at the same time.
    Whats the big book of do's and dont's say Ploughboy?

  2. #12
    4 Star General rustystud's Avatar
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    Quote Originally Posted by DUUANE View Post
    These 302's are governed are they not? Could there be an issue there? Im not too familliar with them other than they are vaccuum operated/related..torn diaphram or broken spring allowing it to close early? I usually disconnect them or remove all together as i can drive and watch a tach at the same time.
    Whats the big book of do's and dont's say Ploughboy?
    The governor can cause poor engine performance if it is malfunctioning. Usually it will not go much above idle though.

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    DUUANE (10-05-2018)

  4. #13
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    Yes truck idles fine and starts right up. Yes can get a full RPM range when sitting still and truck is parked. Motor sounds strong but stumbles like accelerator pump in carb is sticking. We are choosing to rebuild the carb at this point. Will report back when we get that done. Ordering carb kit today. And yes checking the compression is on our list also . Th.nks for the suggestions and help/

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    m1010plowboy (10-05-2018)

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    You could run your choke out a little when accelerating engine in park and it should rev up. You could at least do that and see if there is a change. Also the accelerator pump wouldn't cause you to not get above 30mph over a long stretch in the interstate I wouldn't think. That's my two cents. Could be wrong.

    Im with plowboy, a compressor test would be great to see what your valvetrain is doing. If that checks out you can also do a cylinder leak down test to see the condition of your engine. I realize the average guy doesn't have a cylinder leakage tester but they are invaluable for troubleshooting. In the end a carb rebuild is never a bad idea.
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    Colonel CMPPhil's Avatar
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    Hi

    Can you refresh my memory does this engine have manual or self adjusting valves? Reason I ask is that one of straight six engines in my CMPs went from full power to no power in 30 miles when one of the exhaust valves went to zero clearance. Engine running at full power cut away third of the value head.

    The compression test as suggested should rule out or ID the problem.

    Keep us posted on what you find.

    Cheers Phil

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    4 Star General snowtrac nome's Avatar
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    don't rule out a worn cam bumper on the points. the wrong point gap will change timing and improper coil saturation will equate to a loss of power. also a bad condenser can cause the points to arc.

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    DUUANE (07-23-2019)

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    Well guys here's what we found out. Got a carb kit pull the carb apart. Found several things wrong with the carb, least of which was the governor was stuck open. One of the screws on a governor had fallen out and wedged it open. Rebuilt the carb put it back on adjusted it and the truck runs very well. To all those that put in a few cents thank you very much!

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    1944mb (07-19-2019), CMPPhil (07-19-2019), DUUANE (07-23-2019), m1010plowboy (07-19-2019)

  12. #18
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    Hi

    Thanks for letting us know the end of the story. I hate when you read all the way through a mystery only to find that the last page with the big reveal is missing.

    Cheers Phil

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