October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

Check Valves

Warm engine until normal operating temperature is reached. Stop engine and disconnect air hose from check valve connector.
Slowly increase engine speed to 1500 RPM while holding hand over open connection. Check for exhaust leak from check valve. If exhaust gas escapes, replace check valve.