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

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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Air Injection Check Valve: Testing and Inspection

Whenever a hose is removed from a check valve it should be inspected. Replace check valve if the hose shows signs of exhaust gas contamination. Little or no air should be felt comming from check valve with engine running at idle. Air should flow freely through the valve towards the engine cylinder head.