Air Injection Tube Installation; Flywheel Installation; Engine Accessory Installation; Engine Set-Up And Testing - GMC 1990 Light Truck Repair Manual

AIR INJECTION TUBE
INSTALLATION
Install or Connect (Figure 5)
1. Air injection tube (76).
2. Nut (75).
Tighten
Air injection tube to 34 N m (25 ft. lbs.).
Nuts (75) to 25 N m (18 ft. lbs.).

FLYWHEEL INSTALLATION

Install or Connect
1. Flywheel.
2. Retainer (automatic transmission only).
3. Bolts.
Tighten
• Bolts to 70 N m (52 ft. lbs.).
ENGINE ACCESSORY
INSTALLATION
Install the engine accessories (distributor, TBI unit, oil
filter, generator, etc.) as directed in the proper Truck
Service Manual. Connect all vacuum hoses and electrical
equipment the same way as removed.

ENGINE SET-UP 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.
Figure 44— Exhaust Manifold Installation
8
9.
2.8 LITER V-6 6A2-27
Important
• If a new camshaft or hydraulic lifters were
installed, add Engine Oil Supplement (GM
Part No. 1051396) or equivalent to the engine
oil.
Fill the cooling system with the proper coolant.
With the ignition " OFF," or disconnected, crank the
engine several times. Listen for any unusual noises
or evidence that any parts are binding.
Start the engine and listen for unusual noises.
Run the engine at about 1000 RPM until the engine
is at operating temperature.
Listen for improperly adjusted valves or sticking
lifters, and other unusual noises.
Check for oil and coolant leaks while the engine is
.
running.
Using the proper Truck Service Manual or Emission
Control Label for specifications, adjust the ignition
timing and idle speed.