Craftsman 919. 165610 7HP 60 gal oil less won't build pressure past 30psi

by Michael
(Ft Collins CO)

I have a Sears Craftsman professional 7hp 60 gal #919165610 I don't know how old it is, it has been running fine for almost a year and a half and then it took longer to fill tank than normal.

I use it to run air tools in the garage and occasionally paint, doing a restoration on my camaro.

I have replaced both cylinder pistons and rings, gaskets and o-rings, no broken reeds, all the air lines are clear, the intake is strong, and I even replaced the intake check valve on the tank.

It will run and run and never get above about 30 psi .... there are no leaks that the compressor is trying to overcome.

Please help, I need my compressor!

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Apr 03, 2015
by: Doug in

I feel ya...

Assuming you're sure there's no debris in the o-ring grooves, did you torque the head bolts 7-10 ft/lbs? If at the low end, maybe go toward the high end?

Did you replace the piston sleeves as well?

Apr 01, 2015
by: Michael

I put in the gaskets and the o-rings that came in the kit .... when I tore it down again to check the reed and the lines, everything looked ok!

There were no visible signs of a bad gasket, there were impressions on the gasket where the head and block were bolted together. The o-rings were still seated, no rollover or anything like that.

This is frustrating .... as it should work! Is there a better gasket material I could try?

Apr 01, 2015
by: Doug in

From what you say, there must be a leak somewhere.

Given that the intake is strong, I'd go with the head gasket. It's probably not sealing between the intake and and output sides.

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