SERVICE MANUAL
CYLINDER HEAD & VALVES
Section 3
CHECKING ENGINE GEAR TRAIN TIMING
METHOD TWO USING A DIAL INDICATOR
1.
Adjust the No. 1 intake valve with the No. 1
piston
set
at
TDC
(Top
Dead
Center)
compression stroke as specified in Engine Gear
Train Timing Specification Chart located under
Method One.
2.
Position the dial indicator fixture magnetic base
on the valve cover fence rail with the indicator
shaft on the No. 1 intake valve rotator.
3.
Set dial indicator at zero.
4.
Rotate the engine approximately one full
revolution either direction to a position of 360’
from starting point.
5.
Read the dial indicator. The following readings
indicate proper gear train timing:
300 Series Engines
4.5 mm to 6.0 mm
(.180 in. to .240 in.)
400 Series Engines
3.9 to 5.5 mm
(.155 to .220 in.)
6.
If dial indicator readings are outside the specified
range, the engine’s front cover must be removed
and punch mark and gear tooth position adjusted
as specified in Figure 39.
IMPORTANT: Engine Gear Train Timing and Valve
Lash Adjustment Procedure must be performed as
described
in
this
section.
Following
these
procedures will assure proper valve and piston
relationship and prevent pistons from striking
valves.
CGES-185-3
PRINTED IN UNITED STATES OF AMERICA
Page 33
