Blowing Out Of Manifold Gaskets And Correction - Cadillac 1937 LaSalle VVI Information

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F U E L T A N K A N D E X H A U S T
Fig. 2. Removing Gasoline Tank
The reverse of this procedure should be followed
when installing the gasoline tank.
Note: A piece of Scotch Tape should be placed
over the mouth of the filler neck to insure
that no dust or dirt enters the filler neck
and tank during installation.
2. Crackling Noises in Manifolds
Some V - 1 6 engines when new.give out a crack-
ling 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 contraction of
the manifold sections as the exhaust manifolds
cool. T h i s condition will not injure the engine
and is automatically eliminated after the m a n i -
folds and blocks have taken a permanent set.
T o correct this condition, smooth up the faces
and corners of the manifold flanges w i t h emery
paper and spread t h i n l y a paste made up of
graphite and o i l , over the contacting surfaces.
F i n a l l y pull up the flange nuts tightly but without
excessive strain.
3. Installing Manifold Gaskets
Exhaust manifolds are subject to such extreme
variations i n temperature that the metal expands
and contracts to a considerable degree. F o r this
reason, care should be exercised not to draw the
manifold bolts up too tight.
The manifold bolts should be tightened while-
the engine is running and should be drawn up
just enough to stop all exhaust leaks. . Also, the
bolts attaching the exhaust system brackets to
the mufflers or pipes should be so located in the
slots of the brackets that expansion can take
place rearward.
4. Blowing Out of Manifold Gaskets and
Correction
In case of persistent blowing out of the m a n i -
fold gaskets, the bearing surfaces of the manifolds
should be carefully checked for warpage w i t h a
straight.edge.
The most satisfactory remedy for correction of
this trouble, if found, to be due to excessive warp-
age, is replacement of the manifolds.
Specifications
Series
Subject and Remarks
37-50, 60 37-65, 70,
75, 85
37-90
Gasoline tank capacity
22 gal.
25 gal.
30 gal.