iginal Willard starting
and lighting batteries used two-piece, or "double" covers. These are
shown in the cuts used to illustrate the sealing of double-cover
covers in the preceding chapter, and no further description will be
given here. The doublecover batteries are no longer made, but the
repairman will probably be called upon to repair some of them. The
instructions given in the preceding chapter should be used in making
such repairs.

Following the double cover batteries came the single cover battery, of
which a number of types have been made. One type used a rectangular
post, and was very difficult to repair. Fortunately, this type was not
used extensively, and the battery is obsolete.

Willard Batteries With Compound Sealed Posts

The oldest type single-cover Willard battery which the repairman will
be called upon to handle is the compound sealed post type, illustrated
in-Fig. 277. This battery includes types SEW, SER, SJW, SL, SLR, SM,
SMR, STR, SXW, SXR, SP, SK, SQ, EM, and EMR. As shown in Fig. 277,
there is a well around each post which is filled with: sealing
compound. On the under side of the cover is a corresponding well which
fits into the post well, the sealing compound serving to make the seal
between the cover and the post.

[Fig. 277 Willard Battery cross section]

Aside from this post seal, no special instructions are required in
rebuilding this type of Willard battery. A 3/4 inch drill is needed
for drilling off the connectors. When the plates have been lifted out
of the jars, and are resting on the jar to drain, and while the
compound and cover are still hot, remove the cover by placing your
fingers under it and pressing down on the posts with your thumbs.

With a narrow screw driver or a knife, clean out all of the old
compound from the wells around the posts, and also remove the compound
from the under side of the cover which fits into the post wells.

In reassembling the battery first try on the covers to see that they
will fit in the post wells. Then remove the covers again and heat them
with a soft flame. Then heat the post wells perfectly dry with a soft
flame. Pour the post wells nearly full of compound, and quickly press
the cover into position.

Willard Batteries With Lead Inserts In Covers

The types SJWN and SJRN Willard batteries have lead inserts in the
cover post holes, as shown in Mg. 278, the inserts being welded to the
posts. For removing the connectors and for