Chevrolet Light Duty Truck 1973, Service Manual

Page: 757 / 979

FUEL T A N K S A N D EXHAUST 8 -2 7
EXHAUST SYSTEM
IMPORTANT: Make sure that exhaust system components have at least
3/4 inch clearance from the floor pan to avoid possible overheating of
the floor pan and possible damage to the passenger compartment
carpets.
SERVICE IN FO R M A T IO N
When installing a new exhaust pipe, muffler or tailpipe,
on any model, care should be taken to have the correct
alignment and relationship of the components to each
other. Particular care should be given to the installation
of the exhaust pipe and crossover pipe assembly on V-8
engine single exhaust systems. Incorrectly assembled
parts of the exhaust system are frequently the cause of
annoying noises and rattles due to improper clearances
or obstructions to the normal flow of gases. Leave all
clamp bolts and muffler strap bolts loose until all parts
are properly aligned and then tighten, working from
front to rear.
NOTE: When reinstalling exhaust pipe to
manifold, always use new packings and nuts.
Be sure to clean manifold stud threads with a
wire brush before installing the new nuts.
C O M P O N E N T PART REPLACEMENT (FIGS. 3 7 -4 3 )
(REFER TO ILLUSTRATIONS)
EXHAUST SYSTEM PIPES AND RESONATORS
REARWARD OF THE M UFFLERS MUST BE
REPLACED WHENEVER A NEW MUFFLER IS
INSTALLED.
Truck exhaust systems vary according to series and
model designation. Series 10-30 trucks use a split-joint
design system in which the exhaust pipe-to-muffler are
clamped together and muffler-to-tailpipe connections are
welded together. All mufflers and tailpipes are welded
assemblies (no clamps) in 1973.
NOTE: All 10-20-30 Series exhaust have been
aluminized. Always use the correct replace­
ment parts when servicing these systems.
When installing a new exhaust pipe or muffler and
tailpipe, on any model, care should be taken to have the
correct alignment and relationship of the components to
each other. Particular care should be given to the
installation of the exhaust pipe and crossover pipe
assembly on V-8 engine single exhaust systems.
Incorrectly assembled parts of the exhaust system are
frequently the cause of annoying noises and rattles due
to improper clearances or obstructions to the normal flow
of gases. Leave all clamp bolts and muffler strapbolts
loose until all parts are properly aligned and then
tighten, working from front to rear.
NOTE: When reinstalling exhaust pipe to
manifold, always use new packings and nuts.
Be sure to clean manifold stud threads with a
wire brush when installing the new nuts.
LIGHT DUTY TRUCK SERVICE MANUAL