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

Crank the engine and read the gauge.
Standard value 1,200 kPa (170 psi)
Limit 1,050 kPa (149 psi)

The pressure difference for each of the cylinders is:
Limit Max. 100 kPa (14 psi) between cylinders