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Read the book. Look In the -24 manual. The Listter- Peter engine has negative crankcase pressure. There are instructions on how to build a simple water manometer.

Smokin!!!

Good job mepgen!!

The army does not run synthetic oil. Or didn't when I worked contracting. HDO-15W30, or what ever was directed in the LO.

The water manometer is easy. look at the picture. I made one in about 45 minutes. Drilled holes in a board. Used zip ties to secure the clear plastic hose. Drew some lines across the board and Wah La!! High speed, low drag water manometer. Easy, simple and precise!

Indeed, it has a pressure relief valve.

3-5. CRANKCASE VACUUM.3-5.1. General. The value depends to some extent on the type and size of air cleaner installed on the engine.Regardless of type air cleaner used, vacuum with a clean air cleaner must not be less than a minimum of 0.79 in. (20mm) water gage (WG). The vacuum is measured with...