Intake And Exhaust Manifold Installation; Air Manifold Installation; Flywheel Installation; Engine Accessory Installation - Chevrolet 1988 Light Duty Truck Repair Manual

INTAKE AND EXHAUST
MANIFOLD INSTALLATION
0
Install or C o n n e c t (F ig u re 4)
• The m anifold attaching bolt (39) and nuts (32) must
be finger tight ONLY. Do not tighten the manifold
attaching bolt and nuts until the m anifold to head
bolts and nuts (30 and 35) have been tightened.
1. Gasket (27).
2. Intake and exhaust manifold assembly.
3. C lam ps (34), washers (29), bolts (35) and nuts (30).
T ig h te n
• Nuts (30) and bolts (35) to 52 N m (38 ft. lbs.).
• Nuts (32) and bolts (39) to 60 N m (44 ft. lbs.).

AIR MANIFOLD INSTALLATION

- n - Install or C o n n ect (F ig u re s 7 and 8)
1. Air injection tubes (183).
2. A ir manifold (182).

FLYWHEEL INSTALLATION

C lean (F ig u re 5)
M ating surfaces of the flywheel (118) and crankshaft
(154).
Install or C on n ect (F ig u re s 5 and 18)
0
1. Flywheel (118) to the crankshaft (154). Align the
marks made at disassembly. Make sure the dowel
holes in the crankshaft and flywheel are aligned.
2. Bolts (122).
Tig h ten
• Bolts (122) to 150 N m (110 ft. lbs.).
3. Dowel pins (134).
• T he in te rfe re n c e fit d o w e l p in s m u s t be
replaced with an oversized dowel pin when
installing the flywheel.
• Ream the dowel pin holes to the proper size
(0.4510-0.4517-inch).
• Tap the dowel pins into place, flush with the
flywheel retaining bolt surface.
ENGINE ACCESSORY
INSTALLATION
Install the engine accessories (distributor, carburetor, oil
filter, generator, etc.) as directed in the proper Truck
Service Manual. Connect all vacuum hoses and electrical
equipm ent the same way as removed.
4.8 LITER L6 6A4-31

ENGINE SET-UP AND TESTING

1. A fter overhaul, the engine should be tested before
installing 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. Refer to the proper Truck S ervice
Manual or O w ner's and D river's Manual for this
inform ation. If a new cam shaft or hydraulic lifters
were installed, add Engine Oil S upplem ent (GM part
no. 1051396 or equivalent) to the engine oil. Fill the
cooling system with the proper coolant.
3. W ith the ignition " OFF," or disconnected, crank the
engine several times. Listen for any unusual noises
or evidence that any parts are binding.
4. Start the engine and listen for unusual noises. Run
the engine at about 1000 rpm until the engine is at
operating tem perature.
5. Listen for im properly adjusted valves or sticking
lifters, and other unusual noises.
6. C heck for oil and coolant leaks while the engine is
running.
7. Using the proper Truck Service Manual or Emission
Control Label for specifications, adjust the ignition
tim ing, and idle rpm and mixture.