Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la
If it fails: lemon-manuals.org.ua

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Vacuum Check Valve: Testing and Inspection

Vacuum Check Valve:






Apply 54 kPa (16 in Hg) vacuum to "check" side of the valve and trap. If vacuum remains above 50 kPa (15 in Hg) for 10 seconds, the valve is acceptable.