Mercedes-Benz OM 904-926 LA BlueTec Operating Instructions Manual page 67

X
Clean very dirty cylinder head covers
before removal.
X
Remove engine ventilation hose : from
cylinder head cover ;.
X
Remove cylinder head cover ;.
X
Remove seal A between the cylinder head
cover and the cylinder head.
X
Clean the sealing surfaces of the cylinder
head cover and the cylinder head.
Example: flywheel inspection hole
X
Unscrew the cap from the inspection hole
in the flywheel housing.
X
Fit the cranking device 904 589 04 63 00
( Y page 64) to the flywheel housing inspec-
tion hole. Tightening torque: 25 Nm.
Valve clearance setting
Valve clearance setting OM 904/924 LA
Crankshaft Cylinder/valves to be
position adjusted
1
4th cylinder I/
valve over- E
lap
1st cylinder -
valve over-
lap
2 3 4 5 6
I A -
A I I/
E
I – inlet valve
E – exhaust valve
Valve clearance setting OM 906/926 LA
Crankshaft Cylinder/valves to be
position adjusted
1
6th cylinder I/
valve over- E
lap
1st cylinder -
valve over-
lap
I – inlet valve
E – exhaust valve
Adjust all valve clearances at two crankshaft
positions.
X
Use the cranking device to turn the crank-
shaft until cylinder no. 6 / cylinder no. 4 is
at TDC valve overlap (cylinder no. 1 at igni-
tion TDC).
X
Turn cylinder no. 1 to TDC valve overlap
(cylinder no. 6 at ignition TDC).
X
Check and adjust the valve clearance of all
valves in accordance with the table above.
Checking and adjusting the valve clear-
ance
Work schedules
2 3 4 5 6
I A I A -
A I A I I/
E
65
Z