Air compressor ?

Olen (TN) · Feb 2, 2017

What would cause oil to leak out of this hole?

Bob · Feb 2, 2017

It appears to be an oil pressure operated "unloader" that vents air stuck between the compressor and tank check valve at shutdown, making for a much easier "start".

There's either a diaphragm in there that's sprung a leak or a little piston on which sealing rings have failed.

Olen (TN) · Feb 2, 2017

Thanks I took the top part off and there's a piston in it. I'll check to see about an o ring.

gab · Feb 2, 2017

Think that might be called a hydraulic unloader.

jeffcat · Feb 2, 2017

Also make sure you have the oil level at the correct mark. Some have a dip stick, some you fill to the top, and some you fill to the BOTTOM of the threaded hole where that dip stick goes. I have all three. Also follow what the others have suggested.

Air compressor ?

Olen (TN)

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Bob

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Olen (TN)

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gab

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jeffcat

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