1928 Cadillac - GM Heritage Center

OPERATION 11
ordinarily stay in the position it had before the ignition was switched
off. At such times, therefore, the reading of the gauge is not a true
reading. A true reading is given only when the ignition is switched on.
As filling station rules forbid running the engine while the gasoline tank
is being filled, on such occasions the ignition should be switched off until
the engine stops and then switched
on again, and left on while the
tank is being filled.
If the fuel supply should give out
on the road, so that the vacuum
tank on the dash becomes empty,
it will be necessary after refilling
the gasoline tank to prime the
vacuum tank. To do this, close
the throttle and hold the starter
pedal down for 20 to 30 seconds.
. ¾
circuit.
bfcu^t" froTthe 3 i^n "» throttle must be closed uMe this
is done.
Temperature Indicator
The gauge at the extreme right of the instrument panel (Fig. 4) is a thermometer
for indicating the temperature of
the engine, and takes the place of a temperature
indicator on the radiator. The
bulb end of the thermometer is inserted
in the water jacket at the rear end of the
right-hand cylinder head, and is connected
by a small tube to the dial on the instrument
board.
The normal engine temperature after the Figure 4. The temperature of the
„„• . u__„_,__ .., -.„ ;„ i/r>° . iA-,o water in the cylinders should ranee
s
engine becomes warm is 160 to 190 .
from 16Qo to ^ o
Throttle Control
Fipm 2. The new driver should familiarize himself with the instruments and controls befor<
attempting to drive.
(10;
The power and speed of the engine are controlled by opening and closing
a throttle valve in the carburetor. This throttle is operated both by a hand
lever and a foot pedal.
The foot pedal, or accelerator, is at the right of the brake pedal (Fig. 2).
The hand control is the upper lever above the steering wheel. Both controls
operate the same throttle; the hand lever, however, remains in the