Durango 4WD V6-3.9L VIN X (1998)
Valve: Testing and Inspection
Intake And Exhaust Valves
Inspect the remaining margin after the valves are refaced. Valves with less than 1.190 mm (0.047 inch) margin should be discarded.
Clean valves thoroughly. Discard burned, warped, or cracked valves.
Remove carbon and varnish deposits from inside of valve guides with a reliable guide cleaner.
