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)

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Compression Check

Pressure/Variation



Start the engine and wait until the engine coolant temperature reaches 80 - 95°C (176 - 205°F).



Standard value 1,200 kpa (12.2 kg/cm2, 170 psi)
Limit 1,050 kpa (10.7kg/cm2, 149 psi)
Max between cylinders 100 kpa (1.0 kg/cm2, 14 psi)