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

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

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Non-Linear Vacuum Regulator (NLVR)





1. Connect a vacuum gauge to distributor port (Dist.) of NLVR.
2. With engine idling, a vacuum reading of 7 in. Hg. should be indicated.
3. Gradually, open throttle. As engine speed increases, ported vacuum from the carburetor should be indicated on the vacuum gauge.