Checking valve clearance ‒ Variant (A)
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 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.
Checking TDC position of piston in cylinder A1 – Variant (B)
1.
Install barring device, variant (B), on starter, B side (→ Page 34).
A Cylinder A1 is in firing TDC
B Cylinder A1 is in overlap TDC
2.
Bar engine manually in direction of rotation of the engine until the straight surface (arrow) points up-
wards and the angle between the adjustment aid and the cylinder head is 90° (Figure A).
3.
Continue to turn the crankshaft until the rounded surface (arrow) points upwards and the angle be-
tween the adjustment aid and the cylinder head is 90° (Figure B).
Checking valve clearance ‒ Variant (B)
1.
Check valve clearance with cold engine:
• Inlet = 0.3 +/- 0.05 mm;
• Exhaust = 0.6 +/- 0.05 mm.
2.
Check all valve clearances in two crankshaft positions (firing TDC and overlap TDC of cylinder A1) as
per diagram.
3.
Use feeler gauge to determine the distance between valve bridge and rocker arm.
4.
If the deviation from the reference value exceeds 0.1 mm, adjust valve clearance.
84 | Task Description | MS15033/02E 2015-02
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