Chevrolet 10 1971 Series Chassis Service Manual page 210

ENGINE 6-32
b. Torque bolts to specifications.
6. Install converter housing under pan (if removed).
7. Install exhaust crossover pipe (if removed).
8. Install oil dip stick tube and dip stick.
9. Fill with oil, start engine and check for leaks.
Oil Pump
Removal
1. Remove oil pan as outlined.
2. Remove pump to rear main bearing cap bolt and re­
move pump and extension shaft.
Installation
1. Assemble pump and extension shaft to rear main
bearing cap, aligning slot on top end of extension
shaft with drive tang on lower end of distributor
drive shaft.
2. Install pump to rear bearing cap bolt and torque to
specifications.
Installed position of oil pump screen is
NOTE:
with bottom edge parallel to oil pan rails.
3. Install oil pan as outlined.
Oil Seal (Rear Main)
Replacement
Always replace the upper and lower
NOTE:
seal as a unit. Install seal with lip facing front
of engine.
The rear main bearing oil seal can be replaced (both
halves) without removal of the crankshaft. Extreme care
should be exercised when installing this seal to protect
the sealing bead located in the channel on the outside
diameter of the seal. An installation tool (fig. 5V) can
be used to protect the seal bead when positioning upper
half of seal between crankshaft and block as follows:
1. With the oil pan and oil pump removed, remove the
rear main bearing cap.
2. Remove oil seal from the bearing cap by prying from
the bottom with a small screw driver (fig. 6V).
3. To remove the upper half of the seal, use a small
hammer to tap a brass pin punch on one end of seal
Fig. 6 V — Removing O il Seal (Lower Half)
until it protrudes far enough to be removed with
pliers (fig. 7V).
4. Clean all sealant and foreign material from cylinder
case bearing cap and crankshaft, using anon-abrasive
cleaner.
5. Inspect components for nicks, scraches burrs and
machining defects at all sealing surfaces, case as­
sembly and crankshaft.
6. Coat seal lips and seal bead with light engine oil -
keep oil off seal mating ends.
7. Position tip of tool between crankshaft and seal seat
in cylinder case.
8. Position seal between crankshaft and tip of tool so
that seal bead contacts tip of tool.
Make sure that oil-seal lip is positioned
NOTE:
toward front of engine.
9. Roll seal around crankshaft using tool as a ' 'shoe­
horn'' to protect seal bead from sharp corner of seal
seat surface in cylinder case.
Installation tool must remain in posi­
CAUTION:
tion until seal is properly positioned with both
ends flush with block.
10. Remove tool, being careful not to withdraw seal.
11. Install seal half in bearing cap, again using tool as a
"shoe-horn" , feeding seal into cap using light pres­
sure with thumb and finger.
12. Install bearing cap to case with sealant applied to the
cap-to-case interface being careful to keep sealant
off the seal split line (fig. 8V).
13. Install the rear main bearing cap (with new seal) and
torque to specifications.
Torsional Damper
Removal
1. Remove fan belt, fan and pulley
2. Remove the radiator shroud assembly as outlined
in Section 13.
If additional operations (such as cam­
NOTE:
shaft removal) are not being performed, the
radiator removal will not be necessary.
3. Remove accessory drive pulley then remove damper
retaining bolt.
Fig. 7 V — Removing O il Seal (Upper Half)
10-30 CHEVROLET TRUCK SERVICE MANUAL