1£
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17 .4.21 valves, checking
300117-10
310437-10
302809-10
17 ENGINE
Remove the valve spring retainer and valve springs.
Mark the valve springs according to their normal built-in posi
tion.
Pull the valve down out of the valve guide.
Remove valve stem seal
8
with the special tool.
I
Valve stem seals plier (77229010000) (
�
p. 291)
Remove valve spring seat
0.
Mark the valves corresponding to their installation position.
Info
Place the valves in a carton corresponding to their
installation position and label them.
Check the valve plate for run-out.
Valve - run-out
At the valve plate
:5 0.05 mm (:5 0.002 in)
If the measured value does not meet specifications:
-
Change the valve.
Check sealing seat
6)
on valve for damage and wear.
If the sealing surface is damaged or worn:
Machine the valve seat.
197