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)

Or, hide this message: temporarily or permanently

Load Test

1. Connect a vacuum gauge to engine.
2. Start engine and depress pedal with a force of 44 lb.
3. When vacuum reading is 19.7 in.Hg., stop engine. Observe vacuum gauge for 15 seconds, if gauge shows 18.7-19.7 in.Hg., the unit is operating.