On Vehicle Service; Engine Mounts; Intake Manifold - Chevrolet 1980 Light Duty Truck Service Manual

ENGINE M O UNTS
Engine mounts (fig. 6A4-3 - 6A4-8) are the non-
adjustable type and seldom require service. Broken or
deteriorated mounts should be replaced immediately,
because of the added strain placed on other mounts and
drive line components.
Checking Engine Mounts
Front Mount
Raise the engine to remove weight from the mounts
and to place a slight tension in the rubber. Observe both
mounts while raising engine. If an engine mount exhibits:
a. Hard rubber surface covered with heat check
cracks;
b. Rubber separated from a metal plate of the mount;
c. Rubber split through center
replace the mount. If there is relative movement
between a metal plate of the mount and its attaching points,
lower the engine on the mounts and tighten the screws or
nuts attaching the mount to the engine, frame, or bracket.
Fig. 6A4-3 ~"P " Series Engine M o u n t Bracket

ON VEHICLE SERVICE

Rear Mount
on
transmission mount. If the rubber separates from the metal
plate of the mount or if the tailshaft moves up but not down
(mount bottomed out) replace the mount. If there is relative
movement between a metal plate of the mount and its
attaching point, tighten the screws or nuts attaching the
mount to the transmission or crossmember.
Front M ount Replacement
mounting bracket.
bolts and remove mount.
place.
specifications.
Rear M ount Replacement
propeller shaft parking brake, remove mount attaching bolts
from frame outrigger and clutch housing and remove rear
mounting cushions.
mount.
3 5 0 C U . IN .
R IG H T SIDE O N L Y
propeller shaft parking brake, install new mounting
cushions and bolts.
crossmember-to-mount bolts.
to bolt head as applicable.
INTAKE M A N IFO LD
Removal
with chalk, then remove distributor.
SM ALL BLOCK
Raise the vehicle on a hoist. Push up and pull down
the transmission tailshaft
1. Remove mount retaining bolt from below frame
2. Raise front of engine and remove mount-to-engine
Raise engine only enough for sufficient
NOTICE:
clearance. Check for interference between rear of
engine and cowl panel which could cause distributor
damage.
3. Replace mount to engine and lower engine into
4. Install retaining bolt and torque all bolts to
1. Support engine weight to relieve rear mounts.
2. Remove crossmember-to-mount bolts.
3. On "P" Series with manual transmission and
4. Remove mount-to-transmission bolts, then remove
5. On "P" Series with manual transmission and
6. Install new mount on transmission.
7. While lowering transmission, align and start
8. Torque bolts to specifications then bend lock tabs
1. Drain radiator and remove air cleaner.
2. Disconnect:
• Battery negative cable at battery.
• Radiator upper hose and heater hose at manifold.
• Accelerator linkage at carburetor.
• Fuel line at carburetor.
• Crankcase ventilation lines.
• Spark advance hose at distributor.
3. Remove distributor cap and mark rotor position
6A 4-5
while observing the
LIG H T T R U C K SER V IC E M ANUAL