8.4 Valve Drive
8.4.1 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 gage
Y4342013 1
Torque wrench, 20–100 Nm
F30026582 1
Ratchet adapter
F30027340 1
Engine oil
Preparatory steps
1. Remove cylinder head cover (→ Page 83).
2. Install barring tool (→ Page 70).
3. Bar crankshaft with barring tool in engine di-
rection of rotation until TDC pointer and TDC
mark on the flywheel are aligned.
Checking valve clearance at two crankshaft positions
1. Check TDC position of piston in cylinder A1:
• The piston is at firing TDC when the rocker arms at cylinder A1 are unloaded.
• The piston is at overlap TDC when the rocker arms at cylinder A1 are loaded.
2. Check valve clearance with cold engine:
• Inlet = 0.4 mm;
• Exhaust = 0.6 mm.
80 | Valve Drive |
MS15018/03E 2016-02
TIM-ID: 0000000018 - 006
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