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

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Compression Check: Specifications

AllData Editors Note - Ford does not provide a cranking pressure specification, only an acceptable range.

NOTE: Compression pressure should be checked at normal operating temperature with spark plugs removed and throttle plate wide open. Cylinder compression pressure is considered within specification if lowest cylinder reading is at least 75 percent of highest cylinder reading.