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Valve clearance at two crankshaft positions – Check
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 set value exceeds 0.1 mm, adjust valve clearance.
Valve clearance – Adjustment
1.
Release locknut (1).
2.
Insert feeler gauge (3) between valve
bridge and rocker arm.
3.
Use angular screw driver to set adjusting
screw (2) so that specified valve clearance
is provided.
4.
Feeler gauge (3) must just pass through
the gap.
5.
Use torque wrench to tighten locknut (1) to 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 129).
2.
Install cylinder head cover (→ Page 149).
146 | Task Description | MS150114/01E 2015-03
Size
Type
M16
Tightening torque
Lubricant
Value/Standard
(Engine oil)
90 Nm +9 Nm
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