919.167620 won't build air. Piston ring damaged

by Raymond
(Wellsville ks)

I have a craftsman model 919.167620 less than an hour on it. Won't build pressure. Took out the piston and the ring is damaged. Could this be my problem ? Thank you.

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Mar 19, 2016
by: Doug in s.d.ca

It looks like they don't sell the piston ring by itself, so you may want to look for a ring independent of the application. It'll probably be cheaper than the piston assembly.

Also, can you elaborate on the nature of the ring damage? Did it fold over the edge of the piston or is it just worn all over or?

Mar 19, 2016

by: Bill

Yes, a damaged piston ring would prevent the compressor pump from driving air into the tank.

I believe this is a factory lubed compressor. If so, no added lube is necessary.

Assuming that the factory actually lubed it when the compressor pump was built, then the only other thing I can think of is that running it too long overheated it.

In a delightfully ambiguous statement, the manual says that the "air compressor pump is capable
of running continuously" however, not really. :-)

The manual goes on to say "However, to prolong the life of your air compressor, it is recommended that a 50%-75% average duty cycle be maintained; that is, the air compressor pump should not run more than 30-45 minutes in any given hour."

I wouldn't run any lower end compressor for more than 15-20 minutes before allowing it to sit at least that long to cool down.

Since the compressor has only one hour use, can you return it under warranty?

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