Chevrolet 10 1971 Series Chassis Service Manual page 212

ENGINE 6-34
Fig. 1I V — Installing O il Seal (Cover Removed)
Without Cover R em oved
1. With torsional damper removed, pry seal out of
cover from the front with a large screw driver,
being careful not to damage the surface on the
crankshaft.
2. Install new seal so that open end of seal is toward
the inside of cover and drive it into position with
Tool J-23042 on Small V8 engines or Tool J-22102
on " Mark IV V8,; engines (fig. 12V).
Timing Chain and/or Sprockets
Replacement
1. Remove torsional damper and crankcase front cover
as outlined.
2. Crank engine until marks on camshaft and crankshaft
sprockets are in alignment (fig. 13V).
3. Remove camshaft sprocket to camshaft bolts.
4. Remove camshaft sprocket and timing chain together.
Fig. 12 V — Installing O il Seal (Cover Installed)
5. If crankshaft sprocket is to be replaced on Small V8
6. Install timing chain on camshaft sprocket. Hold the
7. Draw camshaft sprocket onto camshaft, using the
J-5825
Fig. 13V— Timing Sprocket Alignment Marks
Sprocket is a light press fit on camshaft. If sprocket
does not come off easily, a light blow on the lower
edge of the sprocket (with a plastic mallet) should
dislodge the sprocket.
engines remove sprocket using Tool J-5825 (fig.
14V). Install new sprocket using bolt and nut from
J-23523 (fig. 15V). On Mark IV V8 engines remove
sprocket using Tool J-1619 (fig. 16V). install new
sprocket using bolt and nut from Tool J-23523 (fig.
15V).
sprocket vertically with the chain hanging down and
align marks on camshaft and crankshaft sprockets
(fig. 17V).
Do not attempt to drive sprocket on
NOTE:
camshaft as welsh plug at rear of engine can
be dislodged.
three mounting bolts. Torque to specifications.
Fig. 14 V — Removing Crankshaft Sprocket (Small V8)
10-30 CHEVROLET TRUCK SERVICE MANUAL