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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 not under load on
cylinder 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 the engine cold:
• Inlet = 0.4 mm;
• Exhaust = 0.6 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.
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) applying the specified tightening torque, holding adjusting screw (2) firmly with screw‐
driver.
Name
Locknut
86 | Task Description | MW15407/14E 2012-02
Size
Type
Tightening torque
Lubricant
Value/Standard
50 Nm
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