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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
Feeler gauge
Barring tool
Ratchet
Double box wrench
Angular screw driver
Socket wrench
Torque wrench, 10-60 Nm
Preparatory steps
1.
Remove air filter (→ Page 92).
2.
Remove cylinder head cover (→ Page 77).
Positioning A1 piston at TDC
1.
Remove cable from sensor B13 (→ Page 26).
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
Firing TDC in cylinder A1
Overlap TDC in cylinder A1
"E" = inlet valve clearance adjustment permitted, "A" = exhaust valve clearance adjustment permitted
74 | Task Description | MS150063/01E 2012-01
Cylinder
1
2
Bank A
E A
- A
Bank B
E -
E -
Bank A
- -
E -
Bank B
- A
- A
Part No.
Y4345893
F6783914
F30006212
F30002800
F30002816
F30030450
F30510423
3
4
5
6
E -
- A
- -
- A
- A
E -
E A
E -
Qty.
1
1
1
1
1
1
1
7
8
9
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Troubleshooting
