Hudson 63 1936, Mechanical Procedure Manual

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SECTION 4
Page 30
MECHANICAL PROCEDURE MANUAL
Fuel Pump Installation
It is important that the correct gasket and spacer be used
between the crankcase and pump to obtain the correct stroke.
1934-35 and 36 models use only a single gasket. The spacer for
the 1937 standard pump is composed of five layers and is .275"
thick, compressing to .250" when installed. The spacer for the
1937 combination fuel and vacuum pump is composed of six
layers and is .312" thick, compressing to .281" when installed.
These spacers are identical in outside shape and location and
size of bolt holes.
The interior openings in the spacers differ as shown in
Figures 449 and 450.
FUEL PUMP FLANGE
Figure 449
Note in Figure 449, that the spacer is placed next to the
standard fuel pump, then the baffle is placed with the flat side
against the spacer, then the gasket between the baffle and the
crankcase. In this installation two insulating sleeves and insu-
lating washers are used over the attaching cap screws.
The baffle for the combination fuel and vacuum pump as
shown in Figure 450 is shaped to fit into the opening of the
pump mounting flange. This is inserted with the flat side
toward the pump and the small tongue over the return drain
hole at the bottom. If this baffle is reversed, the flange at the top
of the center opening will strike the pump arm. Also the flapper
over the drain hole will prevent oil from returning to the
crankcase. Improper installation will permit oil loss from the
breather hole in the pump body.
The spacer is placed between the pump and the crankcase,
also acting as a gasket.
When installing either of these pumps, be sure the operating
lever is placed between the camshaft and the right side of the
crankcase before attempting to insert the mounting screws.
The 1937 standard fuel pump can be installed on earlier
model cars by using the spacer, baffle gasket and insulating
sleeves and washers also specified for the 1937 installation.
This pump is recommended for all replacement purposes. The
larger capacity of this pump will give greater reserve and fuel
pump will give greater reserve and supply fuel under condi-
tions which may cause vapor lock in the smaller pumps.
The 1937 Combination Fuel and Vacuum Pump can not be
installed on earlier car models as the cam of the earlier
models is not wide enough nor of sufficient stroke to give a
proper drive to the pump.
There have been a few cases in early production 1937
models where a noise developed similar to one noisy tappet.
This has been traced to upper end of the pump operating
lever striking the right side of the crankcase on the suction
stroke. This can be corrected by filing the back of the lever
near the end. Usually a bright spot on the lever will indicate
the point at which this contact is made.
Testing Vacuum Pump
If the windshield wiper does not operate at proper speed or
not at all on a car equipped with the combination fuel and
vacuum pump, the vacuum of the pump should be checked
with a vacuum gauge. The line leading from the pump to the
intake manifold should be disconnected. The vacuum gauge
should then be connected to the line leading to the wind-
shield wiper.
At cranking speed, the vacuum gauge should read 8M" of
mercury and 11" of mercury at 1800 R.P.M. which is equal
to 35 M.P.H. car speed.
This same check, as well as a check of proper baffle and
spacer installation as previously covered, should be made in
any cases of excessive oil consumption. If the vacuum pump
diaphragm becomes punctured, the manifold vacuum will
draw oil through from the crankcase, pass it into the intake
manifold, through the engine and out the exhaust,
thus depleting the engine oil supply leaving no signs of
leakage.
I S S U E D M A Y , 1 9 3 7 Printed in U. S. A.