3z170b - middle cyl wants to whistle after pressere up

by douglas newton
(mansfield,tx., usa)

3z170b Speedaire compressor

3z170b Speedaire compressor

3z170b Speedaire compressor

3z170b, 3 cyl, pumps fine till pressure gets up, then middle seems to want to start whistling, dump a little oil down middle cyl and it stops.

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Mar 29, 2017
whistle
by: Doug in s.d.ca.

I'd guess blow-by at either the valve or rings.

Do you have a check valve at the tank?

If so, does it stop after a while?

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