Diagram for 16V engines – Two
crankshaft positions
Diagram for 20V engines – Two
crankshaft positions
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 under load on cylinder A1, the piston is in overlap TDC.
2.
Check valve clearance adjustment with cold engine:
• Inlet valves (long rocker arm) = 0.2 mm ±0.05 mm
• Exhaust valves (short rocker arm) = 0.5 mm ±0.05 mm
3.
Check all valve clearances in two crankshaft positions (firing TDC and overlap TDC of cylinder A1) as per
diagram:
1 Cylinder A1 is in firing TDC
2 Cylinder A1 is in overlap TDC
I Inlet valve
X Exhaust valve
4.
Use valve setting gauge or feeler gauge to determine the distance between valve bridge and rocker arm.
5.
If the deviation from the set value exceeds 0.1 mm, adjust valve clearance.
166 | Valve Drive | MS150047/05E 2018-08
TIM-ID: 0000000922 - 016
Summary of Contents for 12V4000M93 series
Page 1: ...Operating Instructions Diesel engine 12V4000M93x 16V4000M93x MS150047 05E...
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