Special tools required:
- 11 3 160
- 11 4 400
- 11 5 100
For identification of special tools, refer to ENGINE- SPECIAL TOOLS .
Remove cylinder head. Refer to 11 12 100 Removing and installing/sealing cylinder head (S54) .
Remove fan clutch with fan impeller and fan cowl. Refer to 11 52 020 Removing and installing/replacing fan clutch (S52 / S54 / M52 / M52TU / M54 / M56) .
Remove spark plugs. Refer to 12 12 011 REPLACING ALL SPARK PLUGS (S54) .
With cams pointing upwards, measure valve clearance with special tool 11 3 160.
Note down measured values.
Compare measured valve clearance with prespecified ventil clearance. Refer to 11 34 VALVES WITH SPRINGS S54 .
If the measured valve clearance is outside the stipulated valve clearance tolerance:
Place a clean cloth underneath the valve to be adjusted.
Seal oil return and vent holes.
Seal opening to timing case cover at first cylinder.
Seal spark plug bores.
Carefully detach retaining clip (1) from rocker arm shaft.
Carefully slide rocker arm to one side.
Remove adjustment plates with special tool 11 4 400.
Measure removed adjustment plates.
Insert required adjustment plates with special tool 11 4 400.
When the rocker arm is pushed back, there is the risk that the adjustment plate will also be pushed out.
Carefully push rocker arm back and check correct position of adjustment plates.
Install retaining clip (1).
Check valve clearance. Refer to 11 34 VALVES WITH SPRINGS S54 .