7.3 Valve Drive
7.3.1 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.
Valve clearance gauge
Y4345893 1
Barring device
F6792910 1
Ratchet
F30006212 1
Double-head box wrench
F30002800 1
Angular screw driver
F30453001 1
Socket wrench
F30030450 1
Torque wrench, 20-100 Nm
F30026582 1
Measuring instrument
Y4348409 1
Preparatory steps
1. Install barring tool (→ Page 102).
2. Remove cylinder head cover (→ Page 108).
Move piston of cylinder A1 to
TDC position (without marking
on flywheel)
Note: With cylinder head and valve gear installed.
1. Insert preloaded measuring gauge (2) into
measuring device (4) and secure using
screw (1).
2. Install measuring device (4) in cylinder head
and secure using knurled screw (3).
3. Set dial gauge (2) to zero.
4. Turn engine using barring device until piston
A1 reaches firing TDC.
Result: The piston is at firing TDC when both rocker
arms are unloaded, i.e. have clearance.
Moving piston of cylinder A1 to TDC position (with marking on flywheel)
1. Unscrew plug screw on B-side of flywheel housing.
2. Turn engine in direction of rotation until marking on flywheel is visible in center.
Result: The piston is at firing TDC when both rocker arms are unloaded, i.e. have clearance.
MS15054/00E 2015-09
| Task Description | 105
TIM-ID: 0000060301 - 002
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