CITROEN 2 CV4 1975 Owner's Manual page 25

sulphated, unscrew them, clean them, and soak the felt insulating
washers in castor oil or in neutral vaseline oil. If the vehicle is not
in use, recharge the battery every month.
In Winter, a correct charge protects against frost. The battery
charged normally (a density of 1.25 to 1.27) resists to -50C (-58F),
whilst a discharged battery (density 1.07 to 1.09) may burst at -5C
(23F).
Do not disconnect the leads from the terminals when the engine
is running.
Never recharge the battery without first having disconnecting
Fig. 35
the leads from the two terminals.
Air filter
Air Filter Maintenance (Fig. 35)
1 - Cover
Cleaning instructions are to be found on the filter cover (1).
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