Rocker Arm Cover Installation; Exhaust Manifold Installation; Coolant Pump Installation; Engine Accessory Installation - Chevrolet 1991 Light Duty Truck Repair Manual

6A5-38 V8 ENGINES
Figure 85—Coolant Pump (5.0L and 5.7L Engines)
front and rear of the block in four places as
shown in figure 79.
2. Seals (23) to the block.
3. Intake manifold (21).
4. Bolts (20).
Tighten
Bolts (20) to 40 N-m (30 ft. lbs.). Use the tight­
ening sequence shown in figure 80.
ROCKER ARM COVER
INSTALLATION
Install or Connect (Figures 81 and 82)
E 3
1. Gaskets (34).
2. Rocker arm covers (32).
3. Bolts.
Tighten
• Bolts to specification:
— 5.0L and 5.7L engines: 10 N-m (90 in. lbs.).
— 7.4L engines: 13 N-m (115 in. lbs.).
EXHAUST MANIFOLD
INSTALLATION
Install or Connect (Figures 83 and 84)
1. Exhaust manifold (1).
2. Spark plug wire heat shields (6), if used.
3. Washers (2), tab washers (3) (5.0L and 5.7L
engines) and bolts or studs (4).
Tighten
Bolts or studs to specifications:
— 5.0L and 5.7L engines:
• Two center bolts: 36 N-m (26 ft. lbs.).
10. Coolant
Pump
11. Gasket
Figure 86-4Coolant Pump (7.4L Engines)
• Outside bolts: 28 N-m (20 ft. lbs.).
• Bend the tab washers against the bolt
heads.
— 7.4L engines: 54 N-m (40 ft. lbs.).

COOLANT PUMP INSTALLATION

[»*■[ Install or Connect (Figures 85 and 86)
1. Gaskets (11).
2. Coolant pump (10).
3. Bolts (12).
• Bolts (12) to 40 N-m (30 ft. lbs.).
ENGINE ACCESSORY
INSTALLATION
Install the engine accessories (TBI unit, distributor, oil
filter, generator, etc.) as directed in the proper Service
Manual Section. Connect all vacuum hoses and electri­
cal equipment the same way as removed.

ENGINE SETUP AND TESTING

1. After overhaul, the engine should be tested before
installation in the vehicle. If a suitable test stand is
not available, the following procedure can be used
after the engine is installed in the vehicle.
2. Fill the crankcase with the proper quantity and
grade of oil.
Important
S
• If a new camshaft or hydraulic lifters were
installed, add Engine Oil Supplement
no. 1051396) or equivalent to the engine oil.
3. Fill the coolant system with the proper coolant.
4. With the ignition " OFF," or disconnected, crank
the engine several times. Listen for any unusual
noises or evidence that any parts are binding.
5. Start the engine and listen for unusual noses.
12. Bolt
13. Plug
F9349
part
(GM