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Checking valve clearance at two
crankshaft positions
1.
Check TDC position of piston in cylinder
A1:
• If the rocker arms are unloaded on cylin‐
der A1, the piston is in firing TDC.
• If the rocker arms are under load on cyl‐
inder A1, the piston is in overlap TDC.
2.
Check valve clearance with cold engine:
• Inlet valves (long rocker arm) = 0.2 mm
• Exhaust valves (short rocker arm) =
0.5 mm
3.
Check all valve clearances in two crank‐
shaft positions (firing TDC and overlap TDC
of cylinder A1) as per diagram.
1 Cylinder A1 is in firing TDC
2 Cylinder A1 is in overlap TDC
I Inlet valve
X Exhaust valve
4.
Use feeler gauge to determine the distance
between valve bridge and rocker arm.
5.
If the deviation from the set value exceeds
0.1 mm, adjust valve clearance.
Adjusting valve clearance
1.
Release locknut (1).
2.
Insert feeler gauge between valve bridge
and rocker arm.
3.
Using Allen key, set adjusting screw (2) so
that the specified valve clearance is provid‐
ed.
4.
Feeler gauge 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 tool (→ Page 63).
2.
Install cylinder head cover (→ Page 75).
74 | Task Description | MS150064/01E 2011-11
Size
Type
M16 x 1.5 Tightening torque
Lubricant
Value/Standard
(Engine oil)
90 Nm +9 Nm
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