Operation and maintenance manual

Overhead Set QSB4.5 and QSB6.7
Page 8-4 Section 8 - Maintenance Procedures at 5000 Hours or 4 Years
Align the vibration damper/crankshaft speed indicator ring
so the TDC indicator is at the 12 o'clock position. If both
number 1 cylinder rocker levers are loose, move to the
following steps. If both number 1 cylinder rocker levers
are not loose, rotate the crankshaft 360 degrees.
NOTE: If no TDC mark is present on either the vibration
damper or the crankshaft speed indicator ring, align the
large gap in the crankshaft speed indicator ring to the 5
o'clock position (2). The dowel pin will be visible in the 9
o'clock position (1). Check that both number 1 cylinder
rocker levers are loose. If they are not loose, rotate the
crankshaft 360 degrees and check again.
With the engine in this position, lash can be checked on
the following rocker arms:
(E = exhaust, I = Intake)
Four-cylinder 1I, 1E, 2l, and 3E
Six-cylinder 1I, 1E, 2I, 3E, 4I, and 5E.
Lash Check Limits
mm in
Intake 0.152 MIN 0.006
0.381 MAX 0.015
Exhaust 0.381 MIN 0.015
0.762 MAX 0.030
NOTE: Checking the overhead setting is usually
performed as part of a troubleshooting procedure, and
resetting is not required during checks, as long as the
lash measurements are within the above ranges.