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6.4.2 Valve clearance – Check and adjustment
Preconditions
☑
Engine is stopped and starting disabled.
☑
Engine coolant temperature is max. 40 °C.
☑
Valves are closed.
Special tools, Material, Spare parts
Designation / Use
Part No.
Qty.
Feeler gauge
Y20098771
1
Angular screw driver
F30452765
1
Torque wrench, 60–320 Nm
F30452768
1
Socket wrench, 24 mm
F30029815
1
Engine oil
Preparatory steps
1.
Remove cylinder head cover (→ Page 148).
2.
Install barring device (→ Page 129).
3.
Rotate crankshaft with barring tool in en-
gine direction of rotation until marking
“OT” and pointer are aligned.
Diagram for 20 V engines - two crankshaft positions
Position
Cylin-
der
1
2
3
4
5
6
7
8
9
10
20 V
Firing TDC in cylinder A1
Bank A
I X
– X
– –
I –
– X
I –
– X
I X
I –
– –
Bank B
I –
– X
– –
I –
I X
– –
– X
I X
I –
– X
I
Inlet: Valve clearance adjustment of inlet valve is permitted
X
Exhaust: Valve clearance adjustment of exhaust valve is permitted
–
Valve clearance adjustment is not permitted
MS150108/02E 2015-03
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