Series 37-50, 60, 65, 70 And 75 Engines; Series 37-85 And 90 Engines - Cadillac 1937 LaSalle VVI Information

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E N G I N E
cleaner where the high velocity of the air passing
into the carburetor provides the suction to draw
the air from the crankcase.
Cooling System—The water pump, located at
the front of the right hand cylinder bank, is
driven by a belt which also drives the generator,
located in the engine vee. A permanently sealed
ball bearing is used at the outer end of the water
pump shaft, and automatically adjusted chevron
type water pump packing provides a water and
air tight seal around the shaft at the impeller end.
A separate belt is used to drive the fan. It is
adjusted by raising or lowering the fan bracket,
which is mounted to a support on the engine front
cover. The fan rotates on a permanently sealed
ball bearing, and does not require lubrication in
service.
The water pump draws fluid from the bottom
of the radiator and delivers it directly to the right
cylinder bank. T h e water is then by-passed at
the center of the cylinder block where half of the
fluid is forced through a cored passageway to
the left cylinder bank. After circulating through
the blocks, the fluid passes out through an outlet
in the top of each cylinder head leading to the
upper tank of the radiator and repeats the cycle.
Full length water jackets provide an even tem-
perature over the entire length of the cylinder
walls.
A built-in pressure valve type radiator filler
cap with a bayonet safety catch is used to protect
the cooling system from loss of water or anti-
freeze through boiling.
' Ignition System—The ignition system con-
sists of an induction coil, mounted on the forward
side of the dash; a timer which interrupts the
low tension current. from the battery and pro-
duces a high voltage in the secondary circuit of the
coil : ; and a distributor to direct the high voltage
current to the spark plugs.
The distributor is fully automatic in operation.
It is mounted at the rear of the engine and is
•driven by camshaft gearing as shown in Plate 41,
Fig. 53. A single contact a r m is used w i t h an
eight lobe breaker cam which is integral w i t h the
distributor shaft. T h e ignition setting is indi-
cated by. a timing quadrant at the base of the
distributor housing and is controlled by revolving
the housing a few degrees either way from the
zero mark on the scale. T h e automatic spark
advance is controlled b y centrifugal weights.
'Timing marks are stamped on the belt pulley at
the front end of the crankshaft.
Carburetion—All 37-series Cadillac V - 8 en-
gines are equipped w i t h a Stromberg carburetor,
(See Plate 42, F i g . 55) as standard. O n the 37
series L a Salle V - 8 engines, both Stromberg
carburetors and Carter carburetors, (See F i g . 5b)
were used.
A l t h o u g h the fundamental design of these two
makes of carburetors is different, their operation
and performance is quite similar. T h e y are both
duplex downdraft carburetors. In each case,.the
left barrel supplies fuel to the two center cylinders
in the left cylinder bank and the two end cylinders
in the right cylinder bank. T h e right barrel sup-
plies fuel to the remaining cylinders. E a c h barrel
has a separate main metering jet and an adjustable
idling jet.
B o t h carburetors have vented fuel nozzles which
permit any gas bubbles that may form in the
carburetor to escape without forcing gasoline out
of the nozzle. These nozzles are known as "'non-
percolating" jets, and improve the performance
during overheated conditions which might other-
wise cause difficulty in starting the engine.
B o t h makes of carburetors are provided with a
drain in the float chamber cover of the carburetor
to prevent flooding. A n y gasoline overflowing
into the drain is carried*to the ground by a tube
passing to the rear along the engine vee and down
at the side of the flywheel housing.
T h e Stromberg carburetor is equipped with a
fully automatic electric choke. T h i s device
depends for its operation upon a thermostat and
a small electricTneating element that is heated by
electric current when the ignition switch is turned
on to start the engine.
T h e Carter carburetor has a C l i m a t i c Control
choking device. T h e thermostat in this unit is
operated b y heat piped into the control box from
the exhaust manifolds when the engine is started.
A combination fuel p u m p and v a c u u m p u m p
is mounted on the front engine cover directly
behind the fan. T h e pump is driven by a remov-
able eccentric keyed to the front end of the cam-
shaft.
Manifolds—Two separate intake manifolds
made up in a single casting, are use,d on the 37
series V - 8 engines. E a c h .'manifold supplies the
two center cylinders on one side and the two end
cylinders on the opposite side.
T h e exhaust manifolds, like the intake m a n i -
folds, are mounted on top center of the cylinder
groups. There are three exhaust ports i n each
cylinder bank. T h e end cylinders have individual
ports, while the center cylinders are grouped
together i n one part, from which a passage leads
to the heated chamber of the intake manifold.
A cross-over pipe just forward of the rear exhaust
port connects the left hand exhaust manifold
w i t h the right hand manifold.