GMC 1982 Light Duty Truck, Руководство по обслуживанию

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6A 1-10 IN-LINE 6
3. Install new engine mount to frame bracket and torque
attaching bolts to specifications.
4. Install engine mount through bolt and torque to 30 lb.
ft. (40 N-m) specifications.
Rear Mount Replacement
1. Support engine weight to relieve rear mounts.
2. Remove crossmember-to-mount bolts.
3. On "P" Series with manual transmission and propeller
shaft parking brake, remove mount attaching bolts
from frame outrigger and clutch housing and remove
rear mounting cushions.
4. Remove mount-to-transmission bolts, then remove
mount.
5. On "P" Series with manual transmission and propeller
shaft parking brake, install new mounting cushions and
bolts.
6
. Install new mount on transmission.
7. While lowering transmission, align and start cross-
member-to-mount bolts.
8
. Torque bolts to 45 lb. ft. (60 N-m) then bend lock tabs
to bolt head as applicable.
M A N IF O L D ASSEMBLY - N O N -IN T E G R A T E D
HEAD
Removal
1
. Disconnect battery negative cable at battery.
2. Remove air cleaner.
3. Disconnect both throttle controls at bellcrank and
remove throttle return spring.
4. Disconnect fuel and vacuum lines at carburetor.
5. Disconnect crankcase ventilation hose at rocker arm
cover.
6
. Disconnect vapor hose at canister.
7. Disconnect exhaust pipe at manifold flange.
8
. Remove manifold attaching bolts and clamps then
remove manifold assembly.
9. Check for cracks in manifold castings.
10. Separate manifolds by removing one bolt and two nuts
at center of assembly.
11. Observe gaskets and packing if necessary to diagnose a
leakage problem.
Installation
1. Clean gasket surfaces on cylinder head and manifolds.
2. Lay a straight edge along the full length of the exhaust
port faces and measure any gaps between the straight
edge and the port faces. If at any point a gap of .030"
(,80mm) or more exists, it is likely that the manifold
has distorted to a point where it will not seat properly.
If a good exhaust seal is to be expected, the exhaust
manifold must be replaced.
3. Assemble intake and exhaust manifolds using a new
gasket by reinstalling the one bolt and two nuts at the
center of the manifold to finger tight.
4. Position a new gasket over manifold end studs on the
cylinder head.
5. Install manifold assembly bolts, clamps and washers
while holding manifold assembly in place by hand.
6
. Clean, oil and torque all manifold assembly to cylinder
head bolts and nuts to 40 lbs. ft. (55 N-m).
7. Complete torquing the inlet to exhaust manifold bolt
and two nuts at the center of the manifold to 45 lb. ft.
(61 N-m).
8
. Connect exhaust pipe to manifold using a new packing.
9. Connect crankcase ventilation hose at rocker arm
cover.
1
0. Connect vapor hoses at canister.
11
. Connect fuel and vacuum lines a carburetor.
12. Connect throttle controls at bellcrank and install
throttle return spring.
13. Install air cleaner, start engine, check for leaks and
adjust carburetor idle speed.
EXH A U ST M A N IF O L D ASSEMBLY - INTEGRATED
HEAD
Removal
1. Disconnect negative battery cable.
2. Remove air cleaner.
3. Remove power steering pump and/or A.I.R. pump
brackets, if so equipped.
4. Remove PAIR pipes as outlined in Section
6
E.
5. Raise vehicle on hoist and disconnect exhaust pipe at
manifold and converter bracket at transmission mount.
6
. Lower vehicle.
7. Remove exhaust manifold bolts.
8
. Remove exhaust manifold, check EFE Valve to see if
free and check manifold for cracks.
Installation
If a new exhaust manifold is being installed, the E.F.E.
valve and actuator and rod assembly must be transferred
from the old component.
1. Clean gasket surface and position new gasket on
exhaust manifold.
2. Install manifold bolts, while holding manifold assembly
in place.
3. Torque all manifold to cylinder head bolts in sequence
to torques shown in figure
6
A 1 -9.
4. Raise vehicle on hoist.
5. Connect exhaust pipe at manifold flange and converter
bracket at transmission mount. Attach exhaust pipe
and align exhaust system. Torque attaching bolts to
specification.
/ l ^ V — 1 8 -2 5 18- 25
t
ft. lbs. \ - /
,
— v ft. lbs.
^ & <
^ %
&
35-40
ft.lbs.
4 0 - 4 5
ft.
ibs.
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T IG H T E N IN G S E Q U E N C E
Fig. 6AT9--C ylinder Head To Exhaust M anifold
Tightening Sequence