6.4.3 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 169).
2.
Install barring device (→ Page 150).
3.
Rotate crankshaft with barring tool in en-
gine direction of rotation until marking
“OT” and pointer are aligned.
Diagram for 12/16 V engines – Two crankshaft positions
Position
Cylinder
1
2
3
4
5
6
7
8
9
10
12 V
Firing TDC in cylinder A1
Bank A
I X
I – – X I – – X – –
Bank B
– X I X
I – – X – –
I –
Overlap TDC in cylinder A1
Bank A
– –
I – – X – X I –
I X
Bank B
I –
– – – X I –
I X – 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
MS15027/02E 2015-04
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