Sanborn B4900 lower case pressure

by bruce rousseau
(minnesota)

Sanborn 2 stage b4900, removed oil filler tube when running and it's sucking and blowing from fill hole... bad rings?

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Jan 29, 2019
Case pressure
by: Doug in s.d.ca.

If it were a twin, I'd say possible.

But you have two different size pistons changing the volume of the available space in there - so I think that's to be expected.

That doesn't rule out the possibility of bad rings, of course.

Is there some other symptom of trouble?

Jan 29, 2019
Sanborn 2 stage b4900
by: Bill

Yup, that's what it sounds like.

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