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 or lemon-manuals.org.ua

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Air Injection Check Valve: Testing and Inspection


Fig. 7 - Air Manifold Check Valve Test:






1. Remove check valve from air injection manifold.

2. Blow through the intake side of the valve, then the outlet side, Fig. 7.

3. Air should pass through the valve from the intake side only. If air passes from the outlet side, replace the check valve.