Chevrolet Light Duty Truck 1973 Service Manual page 394

6 5 8 E N G IN E
Fig. 22V—Installing Oil Seal (Cover Installed)
7. Draw camshaft sprocket onto camshaft, using the
three mounting bolts. Torque to specifications.
Fig. 2 4 V — R em o v in g C ra n k s h a ft S p ro c k e t (S m a ll V 8 )
Fig. 25V—Installing Crankshaft Sprocket
J-23042
8. Lubricate timing chain with engine oil.
9. Install crankcase front cover and torsional damper
Camshaft
Measuring Lobe Lift
1. Remove the valve mechanism as outlined.
2. Position indicator with ball socket adapter (Tool
3. Rotate the crankshaft slowly in the direction of
4. Set dial indicator on zero, then rotate the
5. Compare the total lift recorded from the dial
6. Continue to rotate the engine until the indicator
Fig. 23V—Timing Sprocket Alignment Marks
as outlined.
NOTE: Procedure is similar to that used for
checking valve timing. If improper valve
operation is indicated, measure the lift of
each push rod in consecutive order and
record the readings.
J-8520) on push rod (fig. 28V).
NOTE: Make sure push rod is in the lifter
socket.
rotation until the lifter is on the heel of the cam
lobe. At this point, the push rod will be in its lowest
position.
crankshaft slowly, or attach an auxiliary starter
switch and "bump" the engine over, until the push
rod is in fully raised position.
Whenever the engine is cranked
CAUTION:
remotely at the starter, with a special jumper
cable or other means, the distributor primary
lead must be disconnected from the negative
post on the coil.
indicator with specifications.
LIGHT DUTY TRUCK SERVICE MANUAL