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Auckland Star, Volume LXI, Issue 35, 11 February 1930, Page 21

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Starters and dynamos are now so well made and so generally reliable that the owner-driver is apt to forget their exi*tence, and may err on the side of giving them less attention than they deserve. Perhaps the most important point about keeping these electrical units in good order is the necessity for cleanliness, and unfortunately they are often subjected to much dust and dirt, and sometimes oil and wet. Lubrication is of the greatest importance. Over-lubri-cation. will result in all kinds of electrical trouble, as well as the accumulation of dust which will spoil the bearings. One of the mistakes which the

commutator as it rotates. A piece of glass paper of medium grade should be then used on the end of a stick curved to the shape of the commutator, and the segments cleaned by pressing against it while rotating. The carbon brushes should be surfaced, also with glass paper, and to a shape which will make them lie closely in contact, over all the surface, with the commutator. In the case of the starter, additional attention should he given to the self-engaging gear. The pinion should move along the quick thread on the armature shaft quite easily. Very thin oil only should be used here, but a better method is to use plumbago powder. Thick oil attracts dust and grit and may make the "run-up" of the pinion on its thread