TM 9-4910-730-14&P
OPERATING INSTRUCTIONS
b. Position the distributor in the clamp with the
vacuum chamber pointing to the left. Tighten the
4-2. To facilitate the identification of the instru-
clamp arms on the machined surface of the distribu-
ments and controls, the nomenclature used in this
tor body.
section corresponds with the tester nomenclature.
c. Using the elevation crank lower the distributor
See figure 4-1 and table 4-1.
shaft into the chuck for about 3/4". Do not try to bot-
tom the shaft in the chuck.
4-3. OPERATION
d. Tighten the chuck, making sure that the shaft is
4-4. The following instructions are general and do
positioned in the center of its up and down end pIay
not contain specific test parameters. Refer to the
travel. Tighten the elevation clamp lock screw.
manufacturers handbook or the military distributor
manual for specific test procedures and the require-
ments for the distributor being tested.
(Not applicable to electronic pulse generators)
4-7. This test indicates the resistance of the dis-
tributor circuit from the terminal through the
a. Using the elevation crank (Item 4, Fig. 4-1),
points to the distributor body. Excessive resistance
raise the clamp arms high enough to permit the dis-
in the points circuit will degrade the coil operation
tributor shaft to clear the chuck.
Table 4-1. Operating Instruments and Controls
Description
Function
Instrument
Index No.
Or Control
1
Vacuum Gauge
Gauge
Measures vacuum created by tester pump applied
to distributor under test.
Measures speed of distributor under test.
Meter
2
Measures distributor dwell angle when distributor
Dwell meter
Meter
3
is rotating.
Handwheel
Raises elevating mechanism to position clamp arms
Elevation crank
4
to accommodate different size distributors.
Std. Dist.
Testlead
Connection point to distributor under test for stan-
5
dard breaker point distributors.
Pulse Gen.
Testlead
Connection point for electronic pulse generator
6
type distributors.
7
Dwell
Testlead
Connection for measuring dwell.
Vacuum connection to distributor under test.
Vacuum hose
Rubber hose
8
Regulates vacuum applied to test item.
9
Regulator
Control valve
Vacuum On/Off
Switch
Starts and stops vacuum pump.
10
Adjusts dwell meter.
Potentiometer
11
Dwell Calibrate
Tach range High/Low
Selects tachometer range 0 to 2500 or 0 to 500 rpm.
12
Switch
Starts and stops tester in either direction of rota-
Main power switch
Switch
13
tion.
CW-OFF-CCW
Speed adjust
Handwheel
Increases and decreases speed of tester.
14
Indicates the point of ignition established by the
Stroboscope
Disc assembly
15
unit under test.
drives the shaft of the unit under test.
3 jaw chuck
16
Chuck
Hold distributor in position for testing.
Distributor clamp
Clamp arms
17
Switch
Selects internal circuits for type of distributor
18
Standard distributor/
Pulse generator
being tested.
Storage compartment for adapters and accessories
Accessory compartment
Metal door
19
