Table of Contents
Advertisement
EXHAUST SYSTEM
69
General Description
The arrangement of the exhaust systems on
the Cadillac V-8 and the LaSalle cars is the
same.
The exhaust manifolds are connected at
the top to the manifold header to which is con-
nected a single exhaust pipe leading to the muffler.
The
exhaust gases pass from the cylinders
through the manifolds to the header and out
through the exhaust pipe.
The flow of hot gases
through the header heats the fuel mixture quick-
ly to assist in more thorough vaporization of
the fuel.
Two
entirely separate
exhaust systems are
used on both the Cadillac 370-B and 452-B, one
system for each block of cylinders.
Each of
these exhaust systems includes an exhaust mani-
fold, an exhaust pipe, a muffler and a tail pipe.
The 370-B exhaust manifolds are in two sec-
tions and the 452-B manifolds are in three sec-
tions to allow for expansion.
These sections are
connected by tight fitting leak-proof sleeves.
The front section of the 370-B exhaust mani-
folds carries the upper part of the intake header.
The center section of the 452-B manifolds con-
tains part of the heat chamber for heating the
gases passing from the carburetor to the intake
manifold.
AH mufflers have an asbestos lining between
two shells which are welded together at the ends.
The purpose of the asbestos lining is to enable
the muffler to stand the extreme heat.
A tuning chamber is built into the 370-B and
452-B mufflers to reduce exhaust noises.
This
chamber acts on the same principle as the tun-
ing chamber in the carburetor intake silencer.
In addition to the muffler on the 345-B, 355-B
cars, a silencing chamber consisting of a piece of
pipe about two feet long is mounted above and
connected to the tail pipe as shown in Fig. 2,
Plate 36.
This chamber acts on the same prin-
ciple as the tuning chamber in the 370-B and
452-B muffler.
This tuning chamber is also used
on the 452-B tail pipe in addition to the tuning
chamber already in the muffler.
The exhaust pipe on the 345-B and 355-B is
covered with a heavy asbestos insulation to pre-
vent excessive heat under the hood and in the
body.
Rubber cushions are used between the muffler
support brackets and the frame on all models to
prevent the
exhaust
vibrations
being
trans-
mitted to the body.
Service Information
1.
C r a c k l i n g Noises i n M a n i f o l d s
Some 452-B engines when new, give out a crackling noise
after a long run when the ignition is shut off.
This noise will
be heard only in some new engines and is caused by the con-
traction of the manifold sections as the exhaust manifolds
cool.
This condition will not injure the engine and is auto-
matically eliminated after the manifolds and blocks have taken
a permanent set.
T o correct this condition smooth up the faces and corners
of the manifold flanges with emery paper and spread thinly a
paste made up of graphite and oil, over the contacting surfaces.
Finally pull up the flange nuts tightly but without excessive
strain.
2.
I n s t a l l i n g E x h a u s t M a n i f o l d Gaskets
Exhaust manifolds are subject to such extreme variations
in temperature that the metal expands and contracts to a
considerable degree.
This results in "creeping" on the mani-
fold gaskets which has no undesirable effect unless the bolts
are drawn up too tight.
The manifold bolts should be tightened while the engine is
running and should be drawn up just enough to stop all ex-
haust Teaks.
If the bolts are tightened too securely,
the
"creeping" of the manifold may rip the copper of the gasket
and permit the gasket to burn out.
The possibility of V-12 and V-16 intake and exhaust gaskets
blowing out can be greatly reduced by coating them with
graphite before installing.
Coating the gaskets with graphite
makes it easier for the manifold to expand and contract without
pulling or wrinkling the gasket which may in some cases
cause the gasket to blow out.
August 1933
Advertisement
Chapters
Table of Contents
