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Diagram 8V-Two crankshaft
positions
1 Cylinder A1 in firing TDC
2 Cylinder A1 in overlap TDC
I Inlet valve
X Exhaust valve
Checking valve clearance at two crankshaft positions
1.
Check TDC position of piston in cylinder A1:
• The piston is in firing TDC if the rocker arms on cylinder A1 are unloaded.
• If the rocker arms on cylinder A1 are loaded, the piston is in overlap TDC.
2.
Check valve clearance 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 reference 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.
Turn adjusting screw (2) with Allen key until
appropriate valve clearance is set.
4.
Feeler gauge must just pass through the
gap.
5.
Tighten locknut (1) to 90 +9 Nm, holding
adjusting screw (2) firm.
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 48).
2.
Install cylinder head cover (→ Page 66).
MS150032/02E 2012-07 | Task Description | 61
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