TM 9-1829A, April 1944
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2021-07-07
Figure 11: Front and rear of King-Seeley speedometer
Figure 12: Rear of Stewart-Warner Speedometer
Figure 13: Waltham speedometer
4. Bench test procedure
a.
General:
The following test procedure covers all makes of magnetic-type speedometers and tachometers in
this manual. Instruments made by the different manufacturers are located in the manual as follows:
(1)
“AC”: chapter 3.
(2)
Auto-Lite (Motometer): chapter 4.
(3)
King-Seeley: chapter 5.
(4)
Stewart-Warner: chapter 6.
(5)
Waltham: chapter 7.
Refer to applicable chapter for detailed tests, which in some cases are special to each make of instrument.
b.
Test for tight mechanism:
First check to determine whether or not the speedometer or tachometer turns
freely. This may be done by using a short piece of inner core (3 to 4 inches long) with proper tip to fit the
drive position at the neck of the instrument being tested. Insert the short piece of core in instrument socket
and turn slowly 15 to 20 turns (fig. 14). Tightness may be noticeable in one spot, or over a complete
revolution. If tightness or binding is apparent, the instrument should be completely disassembled, and the
defective parts repaired or replaced.