In replacing the covers, the lead collar must be forced down over the post, and special pressure tongs are required for this purpose. Before driving on the old collar, the post should be expanded slightly by driving the point-of a center-punch into the shoulder on the post. Instead of expanding the shoulder a new collar may be used.
Fig. 272 shows the soft rubber gasket being placed over the post, and shows the construction of the cover with its recess to fit the gasket.
Fig. 273 shows the lead collar being placed over the post after the cover is in place.
Fig. 274 shows the special long lipped tongs required to force the collar down on the post shoulder. One lip of the tongs has a hole into which the post fits. The necessary driving force may be obtained by applying pressure to the ends of the lips of the tongs With an ordinary vise. This forces the cover down on the rubber gasket to make the acid-tight seal.
WESTINGHOUSE BATTERIES
Westinghouse batteries have a special seal between covers and posts, as shown in Fig. 275. A lead foundation washer (J) is set around the post. A "U" shaped rubber gasket, (K) is then forced between the cover and post, with the open end up. The lips of this gasket are tapered, with the narrow edge up. A tapered lead sleeve (L) is then forced between the lips of gasket (K), thereby pressing the inner lip against the post and the outer lip against the cover.