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HINTS ON MAINTENANCE.

16th October 1923
Page 30
Page 30, 16th October 1923 — HINTS ON MAINTENANCE.
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How to Get the Best Out of a Vehicle, to Secure Reliability and to Avoid Trouble.

CONTRIBUTIONS are invited for this page from fleet managers, drivers, garage foremen, and mechanics, works staff and draughtsmen, and will be

paid for on a generous scale. Every system, make and type of commercial motor vehicle is being dealt with, and the matter should he written with a view to the disclosure of workshop and,garage practice in the maintenance oi 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 fetters from our driver and mechanic readers. Communications should be addressed to " The Editor, The Commercial Motor, 7-15, Rosebery Avenue, London, E.C.1.'

436.—Reducing 1 ail Wag on a Steam Wagon.

One of our contributors has sent us some interesting particulars regarding a wagon which rocked • so much on the road that it was sometimes a difficult task to keep the loads in position, particularly as these were /of timber.

-On searching for a cause of the trouble, it was found that the rear-axle brasses and sleeve bad worn to such an extent that the spring carriage at the sleeve side had almost an inch of side play. Apart from this trouble, when the movement was towards the differential, it allowed,the internal brake shoes to come almost half-way out of their drum, and thus much of the braking power was lost. As both brass and sleeve were worn, it was no use purchasing merely one of each, and to obtain both would have entailed considerable expense. Finally, it was decided to make a repair in another manner.

Most of the wear had occurred on the brass at the sleeve side of the differential. This sleeve was removed and skimmed true in a lathe. A brass was then made to suit the spring carriage at the top, but 1 in. wider where it surrounded the sleeve, care being taken that the extra metal was on the side nearer to the differential so that the brake shoes were completely covered by the drum. A similar method can be applied to the changespeed pinions when these have worn in the die race, thus allowing them to slip out of gear through side' thrust. To do this, put the pinion in the lathe, turn the race true, and make a larger die.

437.—Preventing Wear on the Side Steering Rod of a Vulcan.

A common complaint with Vulcan vehicles is wear of the side steering rod, which occurs when using the right-hand lock, the off-side wheel then coming into contact with the rod, which acts as a stop for the lock. Consequently, a large amount of wear takes place, until, in extreme cases, a large hole may be worn in the rod, necessitating the fitting of a new one.

s46 A simple device for preventing this wear is shown in our illustration. In fitting this, the front wheels should be jacked up clear of the ground and pulled over on the right look until the off-side wheel is just clear of the steering rod. The drop arm will then be approximately in the position which weshow dotted.

Now mark off on the frame a suitable point at which a hole can be drilled and tapped to -4 in. diameter. Into this hole can be inserted a bolt or stud with a lock-nut. This stud will prevent the drop arm from being brought back sufficiently for the wheel to touch the steering rod, and will thus ensure it a longer life.

438.--Dennis Valves Which Will Not Break.

One of our contributors, is, in charge of 11 buses of which the chassis are the 3-ton 1921 Dennis. These buses have to run up a gradient of 1 in 8 every 15 minutes for 16 hours per day, and a certain amount of trouble has been experienced owing to the heads of the exhaust valves burning off at the necks as a result of the very hard work to which the vehicles are put.

Several types of valves have been tried, but the same trouble has occurred. At last, some special

valves were made with radius under the head instead of the usual standard in. Also a, 20 lb. stronger spring was fitted on the exhaust side only. These valves are now standing up to the work in a very satisfactory manner.

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People: Dennis Valves
Locations: London

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