Question about Craftsman Air Tools & Compressors

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I have 12 gal.1hp craftsman mod.921-166400 won,t build up air,air blows out of the oil fill hole.checked reed valves there good help please????

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I would have to say if you are blowing oil out the crankcase that you have a piston or rings problem

Posted on Dec 11, 2009

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1 Answer

Compressor will run, but only builds to 20 lb pressure. Line to tank gets hot.


Very hot air is an indication of leaking /broken head gasket or reed valve. Before you remove any parts, with compressor running, check all fittings for leaks with soapy water. If no leaks, remove head and examine parts. If reed valve is broken replace as needed or do creative repair. Some valve plates have multiple reeds and only one reed is broken. Depending on your skill level, you can thread the hole and seal with piece of bolt (finished repair must not be any thicker than the plate). Good luck

Jan 29, 2011 | Craftsman 1 hp Air Compressor, 4 gal. -...

1 Answer

Compressor will run but not build pressure. Air is coming out of compressor inlet filter. What could be my problem


You have a broken reed valve(s) in the pump. Without knowing your model number I don't know if it's repairable nor can I recommend a replacement part. If the head is removable, take it off and check the valve plate under it. There should be two or more reeds on each side. If they are chipped or broken or warped from heat they won't seal the valve holes and the system can't build pressure.

Jan 05, 2011 | Craftsman 1 Hp, 4 Gal. Air Compressor

1 Answer

I have a Craftsman 919.165610 2 stage oil free air compressor. It will not build pressure? I have replaced the check valve, checked the filter and still no luck? Help


Problem sounds like valve plate /reed valves or worn cylinder /vinyl ring. Easy to check, push piston to top position and examine cylinder neer top looking for scratches. If scratched, most likely vinyl piston ring/s are worn and allowing pressure to leak past. If cylinders look good /shiney all the way up to top, remove head/s and examine reed plate/s for missing/broken reeds and or torn gasket/s. If your reed plate is missing one reed and your are good at being creative, you can seal individual hole by threading and plugging with thin piece of bolt. Good luck and good holidays

Dec 30, 2010 | Craftsman 25 gal Air Compressor 3 12 hp...

1 Answer

I have a 5 gal, i hp craftsmen compressor, 3 years old, used once a year to blow down sprinkler system. Compressor ran up to 120 lbs upon turn on, would not cycle off. manually shut off unit and turned...


Oil free pumps do tend to blow the piston ring (not too expensive) available at searsparts.com. Remove covers to pump and manually turn crank until piston is at top and look at the condition of the cylinder neer top, If it looks scratched, order cylinder kit with piston ring. If it looks good and shiney, could be the valve plate in the head. There are reed valves that tend to break. Run pump however with covers removed and check with soapy water for air leaks and repair as needed (air leaks under the cover will prevent unit from filling). Good luck

Nov 13, 2010 | Craftsman 15 gal Air Compressor 3 hp UMC...

1 Answer

I have a dewalt air compressor model d55155 will not bulte up any presure changed the cold start valve and the reed valves but not the reed valve plates it seemes like like now i have air coming out the...


If you have oil coming out of the oil fill and dip stick you most likely installed the reed plate upside down. Usually it says this side up or there is an arrow pointing up on the reed plate.
This is a good sketch of compressor and reed valve assy.
http://www.about-air-compressors.com/images/1055.gif

Usually the reeds are on top of the plate facing downward. If you have just a reed disc.. then the disc will need to be inverted.

Thanks for Choosing FixYa.

Kelly

Aug 18, 2010 | Dewalt 2 Hp 4 GAL Air Compressor

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I have a Craftsman 3 gallon 1HP air compressor that will only build pressure up to 25psi. The check valve was checked and looks ok. The pressure regulaor appears to be working ok. Bled off tank.The...


Sounds like the compressor has failed -- probably the valve -- tear down and rebuild is probably the solution, or replace compressor, or just buy another unit. My nature would be to tear it down and see what's going on.

Mar 22, 2010 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

2 Answers

I have a craftsman 1hp 4 gal compresor. It's not building pressure and air is pumping out of the air filter not in???


sounds like reed valves are bad,sometimes you can take the reed valves and flip them over for short fix,best to put new one in unit.

Jun 27, 2009 | Craftsman 1 Hp, 4 Gal. Air Compressor

1 Answer

The air is coming out of the filter instead of intake . Craftsman Air Compressor 12-gal 1hp model 921.166400


if acualy exhaust / engine pressure is coming out of filter it likely to be a bad valve...does engine blow smaoke or oil? is there also pressure coming out of oil crankcase?....let me know , we'll diagnose it! good luck, marty

Jun 14, 2009 | Craftsman Air Tools & Compressors

1 Answer

WILL NOT BUILD PRESSURE


Many craftsman compressor are built by champbell hausfeld using a dry type of cylinder and piston (no oil, no crankcase). If dry type, check for worn cylinder and piston ring. Pieces of the vinyl ring can jamb between the reed valves in the head causing air to escape from the intake. If your compressor has a crankcase and oil, check for broken reed valves in head. Spray soap solution on hoses, checkvalve, drainvalve, and fittings to check for leaks. Most likely problem is reed valves broken or open. Parts are available from sears or match parts to chpower.com. enjoy

Nov 26, 2008 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

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