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Checking valve clearance at two
crankshaft positions
1 Cylinder A1 is in firing TDC
2 Cylinder A1 is in overlap TDC
I Inlet valve
X Exhaust valve
1.
Check TDC position of piston in cylinder A1:
• The piston is at firing TDC when the rockers are unloaded at cylinder A1.
• The piston is at overlap TDC when the rockers are loaded at cylinder A1.
2.
Check valve clearance with cold engine:
• Inlet = 0.4 mm;
• Exhaust = 0.6 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 reference value exceeds 0.1 mm, adjust valve clearance.
Adjusting valve clearance
1.
Loosen locknut (1) and unscrew adjusting
screw (2) slightly.
2.
Insert feeler gauge between valve bridge
and rocker arm.
3.
Readjust adjusting screw (2) so that the
feeler gauge just passes through the gap.
4.
Tighten locknut (1) to 50 Nm, holding ad‐
justing screw (2) firmly with screwdriver.
5.
Check whether the feeler gauge just passes
through between valve bridge and rocker
arm.
Result:
If not, adjust valve clearance.
Final steps
1.
Remove barring tool.
2.
Follow reverse sequence of working steps for installation.
96 | Task Description | MS150025/02E 2012-10
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