Checking the ambient air temperature surroun-ding the voltage regulator (Refer to Fig. 13).
Ambient air temperature refers to the temperature of the air beneath the bonnet of the car. To measure the air temperature, first clip the voltage regulation setting-thermometer onto the regulator cover.
Note:—When checking or adjusting the voltage regu-lators, observe the temperature Indicated by the thermo-meter and refer to the General Data Section for the correct voltage setting.
Run ‘ the engine to stabilise the regulator; this will cause the under-bonnet air to circulate until the regu-lator has stabilised at the ambient air temperature. After the regulator and thermometer have stabilised, the thermometer will show the volt age setting at which the regulator should be operating.
TESTING THE VOLTAGE REGULATOR
(Refer to Fig. 13).
When the voltage regulator is mounted on the regulator test-bench, the ambient air temperature will be the room temperature. Clip the voltage regulator setting-thermo-meter on to the regulator cover and mount a small cooling fan on the regulator test-bench approximately 12 to 15 Inches from the regulator. The cooling fan will provide sufficient air flow to ensure stabilisatlon of the
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regulator at the temperature indicated by the thermo-meter.
After stabilisation, the thermometer will indicate the voltage setting at which the regulator should be operating.
SERVICING
Voltage regulator Adjustment
The adjustment of the voltage regulator must be checked with the unit at normal operating temperature, the battery fully-charged and the engine operating at 1500 r.p.m.
Adjusting cut-in voltage (Refer to Fig. 14)
The voltage regulator cut-In voltage is increased by bending the adjusting arm upwards, or decreasing it by bending the arm downwards.
Adjusting the voltage limiter relay (Refer to Fig. 15)
Carry out the regulator voltage setting test with the cover in position. If the regulator voltage is not w4thln the limits as quoted in the General Data Section, for the ambient temperature Involved, compute the difference as a positive or negative correction.
Remove the regulator cover and carry out a new regu-lator voltage limit test. Adjust the new setting either up or down by the amount of the correction computed.
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