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Wont build pressure over 25 psi after rebuild

I have a 15 gal 3hp craftsman compressor model 919.167243 and it started to make a higher pithced noise and stop building pressure over 20-25. i replaced the headgasket , the oring in the tube, new rod kit, rod,sleeve,ring. i put back together with new parts and same thing. i checked the check valve and it moves freely. unhooked the tube to the check valve and it is pushing air. the motor doesn't stop running at at but i think because of the low pressure. please please help with any ideas or anything

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  • cagey_rider_ Feb 20, 2009

    air builds to about 33 psi and thats it. could it be rings?

  • transam_388 Feb 26, 2009

    how would i check for belt slippage? the belt has teeth and looks good shape. but i will try anything. inlet valve? how do i check that is this built into the top of the head? i soaked the head in carb cleaner.

  • transam_388 Feb 26, 2009

    well the compressor never broke sort of say it just started whine when i was using it and would build pressure. i have exp. with air compressors but i natural assumed the ring and sleeve need replace. i am gonna try un bolting the rod from the motor and see if the whine remains.

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Sounds like the belt is slipping have you checked the inlet and discharge valves also could be bad and leaking or stuck or installed wrong

Posted on Feb 26, 2009

  • Joe Garcia
    Joe Garcia Feb 26, 2009

    i have read elsewhere that the bearings in the motor tend to have a short life and fail .when the compressor failed the first time could some broken parts made their way somewhere in the head or check valve there should be a valve plate with valves on it Im not too sure of the exact design of this without looking at it but I sure ive seen em all.let me say from experience that almost all craftsman air compressors are junk and especially oil less ones the best compressors are ones made from cast iron and lubricated.

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Cagey here i took mine in to be fixed and it was the piston and rings. they couldn't hold over 33psi of pressure.

Posted on Feb 26, 2009

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