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HINTS ON MAINTENANCE.

10th April 1923, Page 28
10th April 1923
Page 28
Page 28, 10th April 1923 — HINTS ON MAINTENANCE.
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How to Get the Best Out of a Vehicle, to Secure Reliability and to Avoid Trouble.

C0NTRII3UTIONS are invited for this page from tle.ct managers, drivers, garage foremen, and mechanics, works staff and draughtsmen, and will I be paid for on a generous scale. Every system, make, and type of commercial motor vehicle is being dealt with, and the matter should be written with a view to 1 the disclosure of workshop and garage practice in the maintenance of a vehicle. • It often happens that even a normal practice, or a practice peculiar to a particular type of vehicle, is not, generally known. Expedients and suggestions for overcoming roadside and other troubles are covered in the following page, dealing with letters from ourdriver and mechanic -readers. -Communications should be addressed to "The Editor, The Commercial Motor, 7-15, Rosebery Avenue, London, E.C.1."

357. — Preventing Oil Leakage . from Tylor Engines.

A common source of trouble experienced by owners of vehicles equipped with Tyler engines is leakage of oil from the front timing case cover, both at the joint belWeen this and the crankcase and at the adjustable gland where the crankshaft projects through'the cover:.

There arc two common .causes for these leakages. First, it is possible that the top and bottom halves of the crankcase have not been pulled together in line. The consequence is that the timing ease cover, when bolted into position, is held against an uneven surface, and a good joint cannot be made. The second . reason may be that the timing ease cover has been .bolted in position without considering whether the metallic packing ring is running concentrically in the white-metal split; bearing. Thai bearing becomes worn through the uneven friction, and a, leakage from the gland nut is the result.

• It is quite easy to overcome these troubles if the joints are made in the right way, and it is advisable to adopt the :following procedure. First, tighten the adjustable gland until it is a 'good running fit on the metallic packing ring, which fits over the crankshaft. When this has been done, slide the cover over the crankshaft into its correct position and insert the bolts which hold this cover to the top half of the crankcase. These bolts should be left slack and dot tightened right up. .

The object of tightening the gland first is, . of course, to centralize this with the crankshaft, as, if • the cover bolts were pulled up first, they might force the cover out of line. .bottom half of the crankcase should next he • .erected, hut only heldloosely in position by six bolts. The final tightening of the belts, both in the bottom half of the crankcase and the timing ease, is of the. greatest importance. The first to be 'tightened up should be those holding the timing case to the top half of the crankcase. The tightening should be done evenly, a turn at thetime to each nut: Following

' this. the 'bolts for holding the timing -case cover to

the bottom half of the crankcase should be dealt with, but not fully tightened until those holding the halves of the crankcase together have also been partly tightened. Tightening can now be completed all round.

It is possible that when adopting this procedure it will be found that some of the bolts cannot be fitted into their holes, in which case it is advisable to

ayen these holes to in., their present size being in. This will permit ample scope for correct fitting.

358. — Withdrawing Brake-shoe Pivot Pin on 15 Ter Fiat.

The brake-shoe pivot pins on the rear axle of the 15 Ter Fiat chassis are tapered and each is held in position by a nut. After they have been in position for some time they are often very difficult to extract without the use of a special appliance. Such a withdrawing tool can easily be made out of an old valve cap of the right shape and size—one from .a engine will perhaps he hest. This cap should be. bored out 'Wit ins, diameter, and turned on the outside to 21. ins. diameter. If there is not already a .

hole for -the sparking plug, drill the cap IT clearance.

The taper pivot pin must now be drilled to a depth

of i, in. and tapped in. E.S.F. for a, 3-in. bolt, which should he screwed right along to the head.

To withdraw the pin; a ant is first run up the thread of the bolt, this is followed by the valve cap, and the bolt is then screwed into the pivot pin, which can. easily be removed by tightening the nut against the face of the valve cap.•

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