Page 141 - CTS - Mechanic Diesel - TP

MECHANIC DIESEL - CITS

TASK 2: Battery specific gravity test using hydrometer

1 Keep the battery on a levelled wooden work bench
2 Remove all the vent plugs
3 Hold the hydrometer vertically

4 Place the nose of the hydrometer in the cell. Ensure that the nose is dipped in the electrolyte
5 Press the rubber bulb of the hydrometer
6 Release bulb to draw the electrolyte upwards
7 Ensure that the electrolyte does not come into the bulb.

8 Record the reading in the tables .Measure the temperature of the battery electrolyte and make temperature
correction of reading by adding or subtracting 4 points(.004) for each 10◦F (-10◦c) above or below the standard
of 80◦ F(26.7◦C)

Cell No. 1 Cell No. 2 Cell No. 3 Cell No. 4 Cell No. 5 Cell No. 6 Remarks

Note:

1 The cell readings should not vary more than 50 point between cells.
2 Protect your hand, eyes and cloth from the battery acid spills.

9 Recharge the battery if specific gravity drops below an average of 1.230.

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CITS : Automotive - Mechanic Diesel - Exercise 8.2