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

Compression Test

- Warm engine to normal operating temperature.
- Remove spark plugs.
- Connect compression tester, special tool 001 589 77 21 00.
Crank engine several times by pressing the contact switch on compression tester, in idle speed position with handbrake applied, to expell residues and soot. See Cranking Engine With Starter.