Chevrolet 70 Series 1970, Service Manual

Page: 463 / 841

ENGINE MOUNTINGS 6D-4
w ith flat w ash ers (4) downward through bracket (3),
cushions (5), and c ro ssm em b er (
8
).
5. Lower the engine onto m ountings, then in ­
s ta ll mounting bolt nut and lock w asher (7) and
tighten in accordance w ith "Engine Mounting B olt
Torque Chart."
CONVENTIONAL AND ALUM. TILT
CAB MODELS (WITH 8V-71 ENGINE)
NOTE: Key num bers in follow ing text r e fe r to
figu re 5.
1. R em ove mounting b olts (
6
), p la te (7), and
low er in su lator (5), then r a ise front of engine high
enough to p erm it rem oval of upper insulator (5).
2. R em ove upper in su lator and in sp ect engine
bracket assem b ly (
1
).
3. If replacem ent of engine bracket (1) is r e ­
quired, rem ove b olts and w ash ers (
2
) to detach
bracket from engine.
4. R e v e r se rem oval procedures given p r e v i­
ou sly to in sta ll bracket (1) an d /or in su lators (5),
re ferrin g to "Engine Mounting B olt Torque Chart"
fo r proper torque valu es for tightening b olts and
nuts.
IN-LINE DIESEL ENGINE
DI AND F I -90 WITH AIR CONDITIONING
NOTE: Key num bers in follow ing text refe r to
figu re
6
.
1. R em ove nut and w ash ers (7,
8
, and 4) from
both mounting b olts (5).
1 Crossmember
6
Mounting Bracket
2 Mounting Cushion (Bolted to Engine)
3 Upper Washer 7 Nut
4 Plain Washer
8
Lower Washer
5 Mounting Bolt 9 Engine Front Cover
Figure 6—Engine Front Mounting on DI, FI90
IVehicles with Air Conditioning)
2. R efer to "TRANSMISSION ON-VEHICLE
SERVICE OPERATIONS" (SEC 7B) of this manual,
for inform ation on tra n sm issio n rear support
on v e h ic le s so equipped, and disconnect a s n e c e s­
sa ry to allow rear end of tra n sm issio n to move
downward. A lso loosen cap b olts at engine rear
mountings (fig.
1 1
).
3. R aise front end of engine to take weight off
front mountings, then rem ove mounting p a rts.
4. If engine front mounting bracket (
6
) r e ­
qu ires replacem ent, the pulley and damner m ust
be rem oved f ir s t. When in stallin g bracket, torque
b olts to 85 foot-pounds, and torque damper hub
retaining bolt to 300 foot-pounds.
5. Lubricate mounting cushions with sp e c ia l
rubber lubricant, in se rt the cushions (
2
) through
openings in bracket (
6
), then low er the front of
engine so w eight is on mounting cushions.
6
. Install b olts and w ash ers a s shown in figure
8
and tighten mounting bolt nuts and rear mounting
cap b olts to torques indicated on "Engine Mounting
B olt Torque Chart."
DI AND F I-90 (WITHOUT AIR CONDITIONING)
NOTE: Key num bers in following text refer to
figu re 7.
1. If support bracket (5) req u ires rep lace­
m ent, rem ove drive b elts from crankshaft pulley,
then rem ove s ix b olts attaching pulley to crankshaft
and rem ove pulley.
2. R em ove bolts attaching damper to flange
on crankshaft hub, then rem ove damper.
3. Support front of engine and rem ove two
b olts (
8
) which sec u r e mountings (2) to support (5).
4. R a ise front of engine to rem ove weight
from support and provide clearan ce for rem oving
mountings (
2
).
5. R em ove bolts and w ash ers (9 and 10) which
attach support to cro ssm em b er (
1
), then rem ove
support (5).
6
. Turn mountings (2) counterclockw ise to
thread the mounting studs out of engine co v er , and
rem ove mountings (and sh im s (3), if used).
7. R ev erse the rem oval procedure to in sta ll
new mountings an d /or support, referrin g to "En­
gine Mounting B olt Torque Chart" for c o rrect bolt
torque.
NOTE: When installing front mountings (2),
u se sh im s (3) as required to a ssu r e that mounting
studs are tight in engine cover when locating pins
are aligned with locating h oles in support (5).
ALUM. TILT SERIES WITH
CUMMINS DIESEL ENGINE
NOTE: Key numbers in follow ing text refer to
figure
8
.
1. Safely support front of engine, then rem ove
CHEVROLET SERIES 70-90 HEAVY DUTY TRUCK SHOP MANUAL