Chevrolet 10 Series 1970 Service Manual page 356

ENGINE 6-34
Fig* 13 V — -Tim ing S pro cket M arks
does not com e o ff ea s ily , a light blow on the low er
edge o f the sprocket (with a plastic m allet) should
dislodge the sprocket.
5. If crankshaft sprocket is to be replaced on Sm all V8
engines rem ove s p r o c k e t
(fig . 14V). Install new sprocket using a 7/16" -20 x 5"
bolt and nut (fig. 15V). On M ark IV V8 engines r e ­
m ove sprocket using T o o l J-1619 (fig. 16V). Install
new sprocket using T o o l J-21058 (fig . 15V).
6. Install tim ing chain on cam shaft sprocket. Hold the
sprocket v e rtic a l with the chain hanging down and
align m arks on cam shaft and crankshaft sprockets
(fig . 17V).
NOTE: Do not attem pt to d riv e
cam shaft as w elsh plug at re a r of engine can
be dislodged.
7. Draw camshaft sprocket onto cam shaft, using the
three mounting bolts. Torqu e to specification s.
F ig . 14V —Removing C ra n k s h a ft S pro cket (S m all V 8 )
8. Lubricate tim ing chain with engine oil.
9. Install crankcase front c o ver and torsion al damper
Cam shaft
Measuring Lobe Lift
using T o o l J-5825
1. R em ove the valve mechanism as outlined.
2. Position
3. Rotate
sprocket on
F ig . 15V — In s ta llin g C ra n ksh a ft S procket
as outlined.
NOTE: Proced u re is sim ila r to that used fo r
checking va lve tim ing. If im proper valve o p era ­
tion is indicated, m easure
push rod in consecutive ord er and reco rd the
readings.
indicator with ball socket adapter
J-8520) on push rod (fig. 18V).
NOTE: Make sure push rod is in the lifte r
socket.
the crankshaft slow ly
rotation until the lift e r is on the heel o f the cam
(TO R SIO N A L DAMPER)
F ig . 16V —Removing C ra n ksh a ft S pro cket (M ark IV V 8)
the lift o f each
(T o o l
in the direction o f
W ASHER
CHEVROLET TRUCK SERVICE MANUAL