11 34 004 Adjusting valve clearance (S54)

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Special Tools Required:

11 3 160
11 4 400
11 5 100
Remove cylinder head cover. Refer to 11 12 000 Removing And Installing, Sealing Cylinder Head Cover (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) and 17 11 031 REPLACING FAN COWL (S54) .

Remove spark plugs. Refer to 12 12 011 REPLACING ALL SPARK PLUGS (S54) .

NOTE: Fit special tool 11 5 100 on four screws on vibration damper and crank engine.

Fig 1: Identifying Adapter With Socket Wrench

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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 ENGINE - TECHNICAL DATA .

Fig 2: Measuring Valve Clearance With Holder With Feeler Gauges

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If the measured valve clearance is outside the stipulated valve clearance tolerance:

CAUTION: It is very easy for the adjustment plates to fall down.

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.

CAUTION: Do not damage sealing surface for cylinder head cover.

Carefully detach retaining clip (1) from rocker arm shaft.

Fig 3: View Of Retaining Clip From Rocker Arm Shaft

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CAUTION: It is very easy for the adjustment plates to fall down. Carefully slide rocker arm to one side.

Fig 4: Aligning Rocker Arm

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NOTE: Special tool 11 4 400 is magnetic.

Remove adjustment plates with special tool 11 4 400.

Fig 5: Removing Adjustment Plates With Holder With Magnet

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Measure removed adjustment plates.

Fig 6: Measuring Removed Adjustment Plates

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CAUTION: It is very easy for the adjustment plates to fall down.

Insert required adjustment plates with special tool 11 4 400.

Fig 7: Inserting Required Adjustment Plates With Special Tool

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CAUTION: Incorrect installation possible!

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.

NOTE: If necessary, check correct position of adjustment plates with a mirror.

Fig 8: Aligning Rocker Arm

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CAUTION: Do not damage sealing surface for cylinder head cover.

Install retaining clip (1).

CAUTION: Retaining clip (1) must snap into place on left and right over rocker arm shaft (2).

Check valve clearance. Refer to ENGINE - TECHNICAL DATA .

Fig 9: Installing Retaining Clip

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