- unscrew the valve cap;
- apply liquid to the valve so that it fills the cavity of the valve;
- when a bubble forms, tighten the valve core with the back of the cap;
- recheck the valve in the specified manner, if bubbles continue to form and if it is impossible to tighten the valve, replace the valve;
- screw the cap onto the valve.
This article is a copy from the website (FordBook)