Checking valve clearance at 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 under load on cylinder A1, the piston is in overlap TDC.
2. Check valve clearance with cold engine:
• Inlet = 0.3 +/- 0.05 mm;
• Exhaust = 0.6 +/- 0.05 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) by a few threads.
2. Insert feeler gauge between valve bridge
and rocker arm (3).
3. Readjust adjusting screw (2) so that the
feeler gauge just passes through the gap.
4. Tighten locknut (1) with torque wrench to specified torque, holding adjusting screw (2) firm with Allen
screw.
Name Size Type Lubricant Value/Standard
Nut M10 x 1 Tightening torque 43 Nm +4 Nm
5. Check if the feeler gauge just passes through between valve bridge and rocker arm (3).
Result: If not, adjust valve clearance.
Final steps
1. Remove barring device.
2. Install cover.
3. Install cylinder head cover (→ Page 39).
38 | Task Description | MS15025/00E 2011-12
TIM-ID: 0000035352 - 001
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