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

Valve Guide: Service and Repair

1.Remove carbon and varnish deposits from inside of valve guides with a reliable guide cleaner.








2.Using a small hole gauge and a micrometer, measure valve guides in 3 places top, middle and bottom. Replace guides if they are not within specification.





3.Check valve guide height.