1942 - 1947 Chevrolet Shop Manual



	*12-14*

	VOLTAGE SETTING Stop the engine and remove the regulator cover. The voltage setting of the regulator is adjusted	In case the voltage does not respond to a slight movement of the spring hanger, the following adjustments are necessary: 1. Clean the regulator points according to instructions given in the repair section. 2. Adjustment of the air gap-Push the armature down all the way by hand. Allow it to come back up until points are just closing; then measure the air gap with a feeler gauge. The distance between the armature and the core should be .075" to .085". The air gap may be adjusted by loosening the two upper contact mounting screws and moving the upper contact support up or down as required to secure the proper air gap, two rights screws in Fig. 26. Be sure that points are lined up and tighten screws down well after adjustment. CLEANING CONTACT POINTS Cleaning the contact points of the current and voltage regulator properly is one of the most important operations the service man will be called on to perform. Dirty or oxidized contact points arc and burn, cause reduced generator output, and run down batteries. If the points are properly cleaned the regulator will be restored to normal operation. If improperly cleaned, improvement in performance will be small and only temporary. Remove the upper contact support, so that each point may be properly and separately cleaned. Use a thin, fine-cut ignition point file and file each point separately. Do not use the file excessively on the rounded (smaller) point. If a cavity is found in the flat point, clean it out with a spoon or riffler file, Fig. 29. Make sure the cavity is actually cleaned out, so good, clean contact is made between the points. Reassemble contact supports, paying particular attention to the position of the insulators, and adjust the air gap.

	Fig. 28-Voltage Regulator Lower Spring Hangars by bending the spiral spring hanger down to increase the spring tension and increase the voltage setting, or by bending the spring hanger up to decrease the spring tension and lower the voltage. Fig. 28. Normally, all adjustments should be made on one spring and the other spring should not be touched. On voltage regulators that are badly out of adjustment after the points have been cleaned and the air gap set. it may be necessary to check the adjustment of the second spring. To do this, remove one spring from the regulator; connect the positive lead of the voltmeter to the generator terminal of the regulator and the negative lead to a good ground. Depress the voltage regulator armature by hand to open the points. Slowly increase the generator speed until the voltmeter reads approximately 3 volts. Release the armature and adjust the spring hanger up or down to secure a voltage reading of 4.5 to 5 volts. Install the other spring and complete the adjustment to 7.2 to 7.4 volts entirely on this spring, as previously explained, without again touching the other spring. NOTE -When the above adjustments are being made, the unit must be at operating temperature and the cover must be in place when voltage readings are taken. After any adjustments, replace the cover, start the engine, and set it to run at a speed equivalent to 30 to 35 miles per hour. Readjust the variable resistance in the volt ammeter to obtain a generator output of 8 to 10 amperes. Now check the regulator voltage, which should be within the limits given above. NOTE -Only a slight bend of the lower spring hanger is necessary to change the voltage setting.
		RIFFLER FILE

		OXIDIZED CAVITY EXAGGERATED VIEW Fig. 29-Cleaning Flat Regulator Point