30/ENGINE - WORK ON THE INDIVIDUAL PARTS
143
302711-10
–
Pre-tension the valve spring using the special tool.
Valve spring compressor (59029019000) (
Insert for valve spring lever (77229060100) (
–
Remove the valve keys and unload the valve spring.
302712-10
–
Remove the valve spring retainer and valve springs.
–
Pull the valve down out of the valve guide.
–
Remove valve stem seal
4
with the special tool.
Pliers for valve stem seals (77229010000) (
–
Remove valve spring seat
5
.
300117-10
–
Mark the valves corresponding to their installation position.
Info
Place the valves in a carton corresponding to their installation position and
label them.
20.21
Checking the valves
200193-10
–
Check the valve plate for run-out.
Valve - run-out
At the valve plate
≤
0.05 mm (
≤
0.002 in)
» If the measured value does not meet specifications:
–
Change the valve.
302809-10
–
Check sealing seat
A
on the valve.
Valve - sealing seat width
Intake
1.40 mm (0.0551 in)
Valve - sealing seat width
Exhaust
1.40 mm (0.0551 in)
» If the sealing seat is not centered on the valve seat or deviates from the specifi-
cation:
–
Rework the valve seat.