17
ENGINE
135
17.4.22 Removing valves
300115-10
–
Take shims
1
out of the valve spring retainers and lay them to one side according
to their normal built-in position.
300116-10
–
Pretension the valve springs using the special tool.
Valve spring compressor (59029019000) (
p. 216)
Valve spring mounting device (78029060000) (
p. 222)
–
Remove valve keys and release tension on the valve springs.
–
Remove spring retainers and spring.
–
Pull the valve down and out of the valve guide, remove the valve stem seal and
valve spring retainer.
300117-10
–
Mark the valves according to their normal built-in position.
Info
Place the valves into a box according to the installation position and label
the box.
17.4.23 Checking valves
200193-10
–
Check the run-out at the valve plate.
Valve - run-out
On the valve plate
≤
0.05 mm (
≤
0.002 in)
» If the measured value does not equal the specified value:
–
Change the valve.
0
0
A
A
400373-10
–
Check the sealing seat
A
on the valve.
Valve - sealing seat width
Intake
1.60 mm (0.063 in)
Valve - sealing seat width
Exhaust
2.00 mm (0.0787 in)
» If the sealing area is not in the center of the valve seat or deviates from the
specified value:
–
Machine the valve seat.