Chevrolet Light Duty Truck 1973 Service Manual page 386

6 - 5 0 E N G IN E
3. Remove distributor cap and mark rotor position
with chalk, then remove distributor.
4. Remove (as required) oil filler bracket, air cleaner
bracket, air compressor and bracket, coil, accelera­
tor return spring and bracket, and accelerator
bellcrank.
5. Remove manifold attaching bolts, then remove
manifold and carburetor as an assembly. Discard
gaskets and seals.
6. If manifold is to be replaced, transfer:
• Carburetor and carburetor mounting studs.
• Temperature sending unit.
• Water outlet and thermostat (use new gasket).
• Heater hose and water pump by-pass adapters.
• EGR Valve (use new gasket).
Installation
1. Clean gasket and seal surfaces on manifold, block,
and cylinder heads.
2. Install manifold seals on block and gaskets on
cylinder heads (fig. 7V). Use sealer at water
passages and where seals butt to gaskets.
3. Install manifold and torque bolts to specifications in
the sequence outlined on the torque sequence chart.
4. Install (if removed) oil filler bracket, air cleaner
bracket, air compressor and bracket, coil, accelera­
tor return spring and bracket and accelerator
bellcrank.
5. Install distributor, positioning rotor at chalk mark,
then install distributor cap.
6. Connect:
REAR SEAL
GASKETS
FRONT SEAL
Fig. 7V—Intake Manifold Gasket and Seal Location
• Spark advance hose and governor line (if so
equipped) at distributor.
• Crankcase ventilation lines (as required).
• Fuel line and choke cable at carburetor.
• Accelerator linkage at pedal lever.
• Water pump by-pass at water pump (use new
gasket).
• Battery cables at battery.
7. Adjust choke cable and accelerator linkage as
outlined.
8. Install air cleaner.
9. Fill with coolant, start engine, adjust ignition
timing and carburetor idle speed and check for
leaks.
Exhaust Manifold
Removal
1. On vehicles so equipped, remove carburetor heater.
2. On right exhaust manifold, disconnect and remove
Delcotron.
3. On "Mark IV V8" engines, remove spark plugs.
4. Disconnect exhaust pipe from manifold and hang
exhaust pipe from frame with wire.
5. Remove end bolts then remove center bolts and
remove manifold.
Installation
1. Clean mating surfaces on manifold and head, then
install manifold in position and install bolts (finger-
tight).
2. Torque manifold bolts to specifications in the
sequence shown on torque chart at end of section.
3. Connect exhaust pipe to manifold. Use new gasket
or packing.
4. On "Mark IV V8" engines, install spark plugs.
Torque plugs to specifications.
5. On right exhaust manifold, install and connect
Delcotron. Adjust belt as outlined in Engine Tune
Up.
6. On vehicles so equipped, install carburetor heater.
7. Start engine and check for leaks.
Rocker Arm Cover
Removal
1. Remove air cleaner.
2. Disconnect crankcase ventilation hoses at rocker
arm covers.
3. Disconnect temperature wire from left rocker arm
clips.
4. On vehicles so equipped, remove carburetor heater
from right exhaust manifold.
LIGHT DUTY TRUCK SERVICE MANUAL