Chevrolet 10 Series 1968, Service Manual

Page: 532 / 713

FUEL TANK AND EXHAUST SYSTEMS 8-7
F ig . 9 —In stalling Fuel Line Retainer
EXHAUST SYSTEM
COMPONENT PART REPLACEMENT
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 and
muffler-to-tailpipe connections are clamped together.
The series 40-60 models use basically a welded system
in which all muffler and tailpipe connecting points are
welded. Regardless of which production system, all
service muffler, exhaust pipe and tailpipe unions are se­
cured with clamps.
NOTE: Exhaust systems on vehicles equipped
with A.I.R. assemblies incorporate special ma­
terials, such as stainless steel and heavier
gauge metals. These materials are necessary
because of the increased heat generated by the
burning of the exhaust gases. A ll 1968 1/2 tons,
plus people carrying 3/4 tons, incorporate stain­
less steel exhaust systems. Always use the
correct replacement parts when servicing these
systems.
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 strapbolts loose until all parts
are properly aligned and then tighten, working from front
to rear.
NOTE:
When reinstalling exhaust pipe to mani­
fold, always use new packings and nuts. Be sure
to clean manifold stud threads with a wire brush
before installing the new nuts.
CHEVROLET TRUCK SERVICE MANUAL