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

Test Values
- Normal compression pressure - 9-10 bar (130-145 psi)
- Min. compression pressure - 7.5 bar (109 psi)
- Max. difference between individual cylinders - 1.5 bar (22 psi)

Special Tools

Compression Pressure Recorder With Accessories:





Remote Starter Switch - PN 001 589 46 21 00:





NOTE: Check compression with engine at operating temperature coolant at 80°C (176°F). Remove ALL spark plugs before testing.





Fig. 1:





Fig. 2: