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 Check



Cylinder Compression Pressure At 300 RPM
Standard 1,275 kPa (13.0 kg/cm2, 185 psi)
Minimum 981 kPa (10.0 kg/cm2, 142 psi)
Differential limit between cylinders 98 kPa (1.0 kg/cm2, 14 psi)