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Air compressor won't run

I replaced the piston, rod and cylinder(kit from Sears) on my craftsman air comp but it won't run. It sticks about 3/4 the way through the cycle

craftsman air comp model 919.165400

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Don't run it with the head off! the cylinder will just up and down with the piston and ruin the seals again. I have three Craftsman compressors in my shop and I've torn them all down at least twice. Rather than pay for the kit, I went to NAPA and got a roll of cork gasket material and made my own seals. They don't last as long but they work great.

I'd be willing to bet your seal it just too tight. I made this mistake the first time around too. it's not a very good design as the piston tilts through the stroke. I would try putting a light coat of heavy weight oil on the cylinder wall and move the piston by hand to lube the seal.

Posted on Dec 17, 2008

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Hi your problem may be that you have fitted the con rod the wrong way around on the crankshaft
although i am not familliar with this model
allso does the unit turn ok with the head off ?

Posted on Dec 06, 2008

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