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.
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.
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