Hudson 1948 - 1952, Service Manual

Page: 161 / 333

ELECTRICAL SYSTEM 6 - 25
FIGURE 23
The heat range of a spark plug is determined by the
distance from the tip of the insulator to the internal gasket
through which the heat passes from the plug to the head.
Plug A, Figure 23, is a hot plug; plug B, with a shorter heat
transfer path, is a cold plug.
CONDENSER
A six volt condenser is used in conjunction with the
distributor breaker points to prevent arcing at the contacts.
The condenser is mounted in the distributor, and the
condenser lead is connected to the breaker arm spring by
the same clip attaching the primary lead. The condenser
body is grounded to the breaker plate by the mounting screw.
Contact pitting will result if a condenser of incorrect
capacity is used. The breaker con t a c t should be examined,
and if the pit mark is on the breaker arm (negative), the
condenser is under capacity. If the pit is on the stationary ,
contact (positive), the condenser is over capacity. .21 to .25
micro-farad for 6 cylinder; .20 to .25 microfarad for 8 cylin-
der.
CONDENSER TEST
1. Block distributor points open with a piece of fibre.
Disconnect the primary lead wire at the distributor.
FIGURE 24
2. Check condenser lead to see that it is not frayed or broken
and is connected securely to breaker arm clip. Condenser
mounting screw must make tight ground to breaker plate.
Ground wire from breaker plate to sub-plate must be se-
curely connected.
3. Connect the two condenser test leads together.
4. Turn the condenser control knob to the "Microhm" posi-
tion and allow the tester to warm up for one minute. Then
turn the control knob to read on the set line.
5. Connect the red lead to the distributor primary terminal
and connect the black lead to the condenser shell, Figure 24.
6. With the control knob turned to the "Microhm" position,
the meter should read in the blue bar marked "MIC" at the
right side for satisfactory condenser circuit resistance.