Chevrolet 10 Series 1970 Service Manual page 354

3INE 6-32
F ig . 7 V —Removing O i l Seal (U pper H a lf)
at parting line do
4. T o rem ove the upper half o f the seal, use a sm all
ham m er to tap a b ra ss pin punch on one end o f seal
until it protrudes fa r
p lie r s (fig. 7V).
NOTE: A lw ays wipe
b efo re in stalling a new seal.
5. Lu bricate the lip of a new seal with engine o il. Keep
o il o ff the parting line su rface. G radually push with
a ham m er handle, w hile turning crankshaft, until
seal is ro lle d into p lace.
main b earing). Be carefu l that seal tangs at parting
line do not cut bead on back o f seal.
6. Apply s ea ler to cylin d er block in seal area
8V).
7. Install the re a r main b earing cap (with new seal)
and torque to sp ecification s.
Torsional Dam per
Removal
1. Rem ove fan belt, fan and pulley
2. R em ove the ra d iator
outlined in Section 13.
NOTE: If additional operations (such as cam ­
shaft rem oval) a re not being p erform ed , the ra-
F ig . 8 V —S ealing Bearing Cap
not cut bead on back o f seal.
enough to be rem oved with
crankshaft surface clean
(Sim ilar to installing a
and shroud assem bly
Fig . 9 V —Removing To rsiona l Damper
diator rem oval w ill not be n ecessary on veh icles
using the M ark IV V8 engines.
3. Rem ove a ccessory d rive pulley then, if so equipped,
rem ove dam per retaining bolt.
4. Install T o o l J-6978 on dam per then, turning pu ller
screw , rem ove dam per (fig . 9V).
NOTE: Tool J-6978 has holes form in g two pat­
terns. A two bolt and a three bolt pattern. The
holes fo r the two bolt pattern must be elongated
fo r use on the M ark IV V8 engines.
Installation
CAUTIO N:
torsional dam per is assem bled to the hub with
a rubber type m ateria l.
cedures (with p roper tool) must be follow ed or
movement o f the in ertia weight section on the
(fig.
hub w ill d estroy
dam per.
1. Coat front cover seal contact area (on dam per) with
engine oil.
2. Install dam per on crankshaft as follow s:
a. P la ce dam per in position o v e r key on crankshaft.
b. Pull torsion al damper onto crankshaft (fig. 10V)
as
as follow s:
c. On Mark IV engines use T o o l J-21058.
NOTE: If radiator has not been rem oved from
the veh icle a l/ 2 "-2 0 x 5" bolt and a l/ 2 "-2 0
nut may be used in place o f the bolt and nut
from T o o l J -2 1058.
CAUTIO N:
ficien t thread engagement (min. 1/2").
d. On Small
7/16"-20 x 5" bolt and nut in place of bolt and
nut furnished with J - 2 1058.
e. R em ove tool from crankshaft then install damper
retaining bolt and torque to specifications.
3. Install a ccesso ry d rive pulley.
4. Install radiator and shroud as outlined in Section 13.
5. Install fan and pulley to w ater pump hub and tighten
secu rely.
6. Install fan belt and adjust to specification s using
strand tension gauge.
7. F ill cooling system , start engine and check fo r leaks.
The inertia weight section o f the
The installation p ro ­
the tuning o f the torsion al
Install bolt in crankshaft with suf­
V8 engines install damper using a
CHEVROLET TRUCK SERVICE MANUAL