The valvetrain on the N52 introduced in 2006, used 5 mm valve stems on both
the intake and exhaust. To
increase durability, the exhaust valve stems were increased to 6 mm from 6/06
production.
All of the new NG6 engine have adopted the 6 mm valve stem for the exhaust, the
intake stem remains at
REMOVING AND INSTALLING/REPLACING TANK LEAK DIAGNOSIS MODULE
(PETROL/GASOLINE CARS WITH US DMTL VERSION)
Necessary preliminary tasks:
Remove carbon canister.
Unlock and disconnect quick-connect coupling (1).
Unfasten hose clip (2) and remove hose.
Installation:
If necessary, replace hose clamp.