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Position
16 V
Firing TDC in cylinder A1
Overlap TDC in cylinder A1
Inlet: Valve clearance adjustment of inlet valve is permitted
I
Exhaust: Valve clearance adjustment of exhaust valve is permitted
X
Valve clearance adjustment is not permitted
–
Table 39: Scheme for valve clearance adjustment
Checking valve clearance at two crankshaft positions
1.
Check TDC position of piston in cylinder A1:
• If rocker arms on cylinder A1 are unloaded, the piston is in firing TDC.
• If rocker arms on cylinder A1 are loaded, the piston is in overlap TDC.
2.
Check valve clearance adjustment with cold engine:
• Inlet valves (long rocker arm) = 0.3 mm
• Exhaust valves (short rocker arm) = 0.5 mm
3.
Check all valve clearances in two crankshaft positions (firing TDC and overlap TDC of cylinder A1) as
per diagram.
4.
Use feeler gauge to determine the distance between valve bridge and rocker arm.
5.
If the deviation from the specified value exceeds 0.1 mm, adjust valve clearance.
Adjusting valve clearance
1.
Release locknut (1).
2.
Insert feeler gauge (3) between valve
bridge and rocker arm.
3.
Using angular screw driver, set adjusting
screw (2) so that the specified valve clear-
ance is provided.
4.
Feeler gauge (3) must just pass through
the gap.
5.
Tighten locknut (1) with torque wrench to the specified tightening torque, holding the adjusting
screw (2) to prevent it from turning.
Name
Locknut
6.
Replace or rectify adjusting screws and/or locknuts which do not move freely.
7.
Check valve clearance.
Final steps
1.
Remove barring device (→ Page 150).
2.
Install cylinder head cover (→ Page 170).
168 | Task Description | MS15027/02E 2015-04
Cylinder
Bank A
Bank B
Bank A
Bank B
Size
Type
M16
Tightening torque
1
2
3
4
5
I X
– X
I –
– X
I –
I –
I –
– – – X – – – X
– –
I –
– X
I –
– X – X – –
– X – X
I X
I –
I X
Lubricant
(Engine oil)
10
6
7
8
9
I –
I X
– –
I X
– X
I X
I –
– –
I –
Value/Standard
90 Nm +9 Nm
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