GMC 4000 Series Service Manual page 277

Sec. 6A
Page 266
GASOLINE ENGINES
INSTALLATION
1. Use crane-type hoist to move engine into
position in chassis.
2. Assem ble mountings and bolts, referring
to ENGINE MOUNTINGS (SEC. 6D) for required
information.
3. Install transm ission and fan. Install radiator
and shroud, and connect radiator hose and heater
hose, install rocker arm cover and connect crank­
case ventilation hose.
4. Connect exhaust pipe.
5. Reconnect all wiring and controls and in­
stall item s which were removed or disconnected
during engine removal.
6. Fill crankcase to "FULL" mark on oil level
dipstick. Fill cooling system . Recommendations
regarding engine oil type and viscosity are includ­
ed in LUBRICATION (SEC. 0) in this manual.
7. Start engine and check for oil leaks and
leaks in cooling system .
V 6 ENGINE REPLACEMENT FOR
CONVENTIONAL CAB MODELS
ENGINE REMOVAL
1. Drain radiator.
2. Disconnect battery.
3. Remove hood attaching parts and remove
hood.
4. Remove grille and radiator braces.
5. Remove radiator and heater hoses.
6. Disconnect oil cooler lines from radiator.
(Some engines do not have oil cooler.)
7. Remove grille and radiator. Also, remove
front bumper.
8. Disconnect fuel supply line.
9. On vehicles with air com pressor, discon­
nect air lines.
10. Disconnect engine ground strap.
11. Disconnect exhaust pipes from exhaust
manifolds.
12. Disconnect accelerator and choke controls
from carburetor.
13. Disconnect tachometer drive (when used).
Also disconnect oil gauge pressure line (when used).
14. If vehicle is equipped with power steering,
the power steering pump may be removed from
engine and fluid lines may remain connected dur­
ing engine removal.
15. The hydraulic clutch release cylinder line
(when used) should remain attached to cylinder, the
cylinder mounting bolts removed to permit engine
removal without draining fluid from clutch release
system .
16. Attach lifting sling to overhead hoist and
take weight off front mounting.
17. Remove clutch housing-to-flywheel hous­
ing bolts, then carefully work engine forward to
G M C S E R V I C E M A N U A L
disengage transm ission drive gear from clutch
driven member splines. When free from transm is­
sion, raise engine and remove from vehicle.
ENGINE INSTALLATION
versing "Removal" procedure, meanwhile taking
necessary precautions to maintain cleanliness and
to avoid damaging components.
control linkage. Fill cooling system and check for
leaks.
grade and viscosity, referring to LUBRICATION
(SEC. 0) in this manual.
set ignition timing, and adjust valve lash.
the foregoing adjustments will have been made
previously and need not be repeated.
GENERAL
tilt-cab models with V6 gasoline engine will vary
with the model and optional equipment involved.
Procedure which follows will serve as a guide for
use when engine replacement is necessary. In most
instances the transmission and engine should be
removed as an assembly.
REMOVAL
Cooler lines are attached to fittings at bottom tank
on radiator. Oil will drain from lines and cooler
when lines are disconnected.
starter; also, disconnect engine ground strap.
tach hoses from surge tank. Remove air cleaners
and inlet hoses as necessary to permit removal of
control island assembly.
port.
release lever and flywheel housing. The fluid line
may remain attached to cylinder to prevent fluid
from draining from clutch control system while
engine is removed.
when air-operated brake is used) and speedometer
drive at rear of transmission.
Engine installation is accomplished by re­
After engine is installed, check operation of
Fill crankcase with engine oil of recommended
Start engine, make adjustments at carburetor,
NOTE: If engine has been run in on test stand,
V 6 ENGINE REPLACEMENT FOR
TILT CAB MODELS
The steps required to replace an engine in
1. Drain radiator and disconnect battery.
2. Disconnect oil cooler lines (when used).
3. Disconnect electrical wiring and cables at
4. Disconnect throttle and choke controls.
5. Disconnect transm ission control rods, de­
6. Remove control island, and cab rear sup­
7. Disconnect exhaust pipes from manifolds.
8. Disconnect clutch control cylinder from
9. Disconnect parking brake control (except