7.5 Valve Drive
7.5.1 Valve clearance – Check and adjustment
Preconditions
☑ Engine is stopped and starting disabled.
☑ Engine coolant temperature is max. 40 °C.
☑ Valves are closed.
Special tools, Material, Spare parts
Designation / Use
Part No.
Qty.
Feeler gauge
Y4345893
1
Barring tool
F6783914
1
Ratchet
F30006212
1
Double box wrench
F30002800
1
Angular screw driver
F30002816
1
Socket wrench
F30030450
1
Torque wrench, 10-60 Nm
F30510423
1
Preparatory steps
1.
Remove air filter (→ Page 91).
2.
Remove cylinder head cover (→ Page 76).
Positioning A1 piston at TDC
1.
Remove cable from sensor B13 (→ Page 25).
2.
Remove sensor B13.
3.
Using ratchet and barring tool, rotate crankshaft in engine direction of rotation until the marking on the
flywheel is aligned with the center of the sensor seat.
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 loaded on cylinder A1, the piston is in overlap TDC.
2.
Check valve clearance with cold engine:
• Inlet (E) = 0.3 mm;
• Exhaust (A) = 0.4 mm.
3.
Check all valve clearances at two crankshaft positions (firing TDC and overlap TDC) according to the
table below.
8V2000
Position
Cylinder
1
2
3
4
5
6
7
8
9
Firing TDC in cylinder A1
Bank A
E A
- A
E -
- A
Bank B
E -
E -
- -
- A
Overlap TDC in cylinder A1
Bank A
- -
E -
- A
E -
Bank B
- A
- A
E A
E -
“E” = inlet valve clearance adjustment permitted, “A” = exhaust valve clearance adjustment permitted
M015700/06E 2012-06 | Task Description | 73
TIM-ID: 0000004363 - 003
