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 the engine cold:
• 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.
4.
Use feeler gage to determine the distance between valve bridge and rocker arm.
5.
If the deviation from the reference value exceeds 0.1 mm, adjust valve clearance.
Adjusting valve clearance
Position
Cylin-
der
1
2
3
4
5
6
7
8
Firing TDC in
cylinder A1
Bank A “E”, “A”
“A”
“A”
“E”
“A”
“E”
-
-
Bank B “E”
“A”
-
“E”
“E”, “A”
“E”
“E”, “A”
“A”
Overlap TDC
in cylinder A1
Bank A -
“E”
“E”
“A”
“E”
“A”
“E”, “A”
“E”, “A”
Bank B “A”
“E”
“E”, “A”
“A”
-
“A”
-
“E”
1.
Loosen locknut (1) and unscrew adjusting
screw (2) by a few threads.
2.
Insert feeler gage between valve bridge and
rocker arm.
3.
Readjust adjusting screw (2) so that the
feeler gage just passes through the gap.
4.
Tighten locknut (1) with torque wrench to
the prescribed tightening torque of 50 Nm
while holding the adjusting screw (2) with
an Allen key.
5.
Insert feeler gage between valve bridge and
rocker arm to verify that the gage just
passes through the gap.
Result:
If not, adjust valve clearance.
Final steps
1.
Remove barring gear.
2.
Install cylinder head cover (→ Page 76).
3.
Install air filter (→ Page 94).
78 | Task Description | MS150119/00E 2014-08
TIM-ID: 0000055242 - 001
