Re: the earlier discussions on this subject, I happened to be perusing
my 1957 Technical Service Bulletins, and observed the following
information. (BTW, the TSB's refer to the Neutral 'Safety' Switch, @ the
transmision, as being the Neutral "Starter" Switch; 'this' TSB refers
to the small, 2-pronged vacuum-switch, which is screwed-into the intake
manifold) :
TSB: #D-43 ; " ELECTRICAL ; TorqueFlite Vacuum Safety Switch" (2/15/57)
"If difficulty is encountered in starting the 1957 Dodge V-8 Engines
(TorqueFlite equipped), especially when the engine is fully warmed, it
possibly could be traced to the faulty operation of the vacuum safety
switch.
This switch, which is mounted at the left rear of the intake manifold,
can be quickly tested by wrapping a soft piece of wire around the bottom
of both terminals to by-pass the switch and complete the circuit. If the
engine starts, with the switch by-passed, it would indicate the fault is
in the switch assembly.
In most cases, switch failures have been caused by the heat of the
engine expanding the trapped air above the diaphram and forcing the
switch to break contact when the engine is stopped.
If this condition exists, it can be correcrted by incorporating a vent
hole ( not over 1/32') in the cap section of the switch just below the
fiber insulating washers. This hole can be punched anywhere in the outer
diameter of the cap , with a sharp pointed tool similar to an ice pick.
"
(the TSB shows a small hole 'punched' into the side of the switch,
below its fiber-insulating base , and above the 'wide' , upper
'shoulders' , on the switch. )
Neil Vedder
57 D-500
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