GMC 4000 Series Service Manual page 318

DESCRIPTION
Cushion-type mountings are used at all engine
mounting points. A single front mount is used with
all V6 engines; whereas, dual front mounts are
used with all In-line engines.
The various types of mountings are illustrated
in figures 1 through 4.
GENERAL MAINTENANCE
Engine mountings should be inspected period­
ically and replaced if found damaged or deterior­
ated.
IMPORTANT: Broken or deteriorated mounts
can cause misalignment and eventual destruction
of certain drive train components. Also, when a
single mounting failure occurs, the remaining
mounts are subjected to abnormally high str esses.
BOLT TORQUES (FT.-LB.) GIVEN UNLESS OTHERWISE SPECIFIED
ENGINE FRONT MOUNTINGS
Mounting Bracket
Models
To Engine Bolts
LV, LA-4000
PS-4500
DLV, DLA-4000
EG, EM,
SG, SM-5500;
EG, SM-6500
EM-4500; EM-6500
ES-4500; ES,
SS-5500;
*Nut Torque.
G M C S E R V I C E M A N U A L
SECTION 6D
£*taine M ountuu^i
ENGINE M O U N TIN G TORQUE CHART
Mounting
Bolts
60 - 70 50 - 60
40 - 50 55 - 75
60 - 70 50 - 60
60 - 70
95 - 105
60 - 70
95 - 105
25 - 30 40 - 50
When inspecting engine mounts, check all at­
taching bolts and nuts for tightness. Refer to Torque
Chart shown below:
M O UNTING CUSHION REPLACEMENT
IMPORTANT: When supporting engine to re­
place a mount, raise engine only to height required
to replace the mount. If raised beyond this height,
possible damage to wiring, lines and control link­
age could occur.
When replacing either rear mount it is n eces­
sary to raise only that particular side of engine.
1. Before lowering engine onto new mounting
cushion, make sure cushion, bolts and bolt spacers
(if used) are positioned properly. Refer to applic­
able illustration.
NOTE: If an alignment dowel is used at mount­
ing make certain that it engages the locating hole
in mating part.
ENGINE REAR MOUNTINGS
Mounting Bracket Mounting
To Engine Bolts Bolts
55 - 75
-
-
55 - 75
45 - 55 120 - 130
55 - 65 130 - 140
- 55 - 65
-
55 - 75
Sec. 6D
Page 307
Mounting Bracket
To Frame Bolts
*40 - 50
*40 - 50
-
*40 - 50
*40 - 50
*45 - 55