Question about Craftsman 3 gal. Air Compressor, 1 hp, Tank

1 Answer

I have a craftsman 921.153101 air compresser .It builds about 60 lbs and contines to run .

It holds pressure in the tank overnight . and no back pessure out thr intake. It has a lot of crankcase pressure I think it is blow by .Can the rings be bad without looking bad ? The cylinder looks and feels good.

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  • 80 Answers

Might be the valve plate is worn or has a broken reed.

Posted on Jan 16, 2013

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Posted on Jan 02, 2017

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SOURCE: lack of pressure

My air compressor builds up to 40 psi and just keeps running, i have a craftsman 5 GAL, 1HP, 125 PSI and pressure goes up to 40 psi and dose not go any higher and on the other hand engine keeps running and dose not stop. Please advise?
Thanks.
Kia

Posted on Nov 25, 2008

  • 1388 Answers

SOURCE: Will not build up pressure

If this compressor is dry type with no oil needed, then it may have a worn cylinder and/or piston ring. With flashlight in hand, look under cylinder with piston in upper most position. If you see scratches most likely it needs cylinder / piston kit. Not to worry, not too expensive. If you compressor has a crankcase with oil, then you may have problems with valves in the head. Cracked or dirt under headvalves will prevent pressure from building. Finally there may be one or several leaks in the tubing, check leaks with soapy water. enjoy

Posted on Nov 29, 2008

  • 89 Answers

SOURCE: tank will not build pressure beyond 25 lbs. Just runs

IS YOUR AIR FILTER CLOGGED. SOUNDS LIKE THE VALVES IN YOUR HEAD ARE NOT CLOSING ALL THE WAY. THEY ARE MOST LIKELY REED VALVES, THIN STRIPS OF METAL THAT OPEN AND CLOSE WHEN THE PISTON MOVES. MAKE SURE THEY ARE CLOSING ALL THE WAY (NOT CARBONED UP). DID YOU REMOVE THE HEAD AND DID YOU PUT BACK LIKE YOU FOUND IT - NOT TURNED OR FLIPPED OVER. SEE IF YOUR FINGER WILL GET SUCKED UP TO THE INTAKE HOLE.

Posted on Apr 12, 2009

protek480
  • 1714 Answers

SOURCE: WILL NOT BUILD UP AIR PRESSURE PAST 20 LBS.

Check to see if air is leaking past 'pressure relief' valve. It's probably leaking and that's where all the air is going.

Posted on Sep 11, 2009

wiringlunati
  • 576 Answers

SOURCE: Air pressure does not go over 25 psi I have taken

Does it shut off at 25 psi or just keep running and never build more pressure than that? Also, did this come on gradually or suddenly? Also, was it being used regularly when it happened or had it been sitting for a while?

Posted on Mar 07, 2010

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