Checking valve clearance in two crankshaft positions
1.
Check TDC position of piston in cylinder A1:
• If the rocker arms are unloaded on cylinder A1, the piston is in firing TDC.
• If the rocker arms are loaded on cylinder A1, the piston is in overlap TDC.
2.
Check valve clearance adjustment with engine cold:
• Inlet valves (long rocker arm) = 0.2 mm
• Exhaust valves (short rocker arm) = 0.5 mm
3.
Check all valve clearances at two crankshaft positions (firing and overlap TDC for cylinder A1) as per
diagram.
4.
Use feeler gage 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 gage (3) between valve bridge
and rocker arm.
3.
Using Allen key, set adjusting screw (2) so
that the specified valve clearance is provid-
ed.
Note:
Feeler gage must just pass through the
gap.
4.
Pull feeler gage (3) between valve bridge
and rocker arm.
5.
Tighten locknut (1) to the specified tightening torque, holding adjusting screw (2) firmly.
Name
Size
Type
Lubricant
Value/Standard
Locknut
M16 x 1.5 Tightening torque
(Engine oil)
90 Nm + 9 Nm
6.
Replace or rectify adjusting screws and/or locknuts which do not move freely.
7.
Check valve clearance.
Final steps
1.
Remove barring gear (→ Page 164).
2.
Install cylinder head cover (→ Page 178).
3.
Enable engine start.
MS150069/02E 2014-03
| Task Description | 177
TIM-ID: 0000012224 - 007
