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RUNNING, UPKEEP AND VERHAUL.

2nd October 1928, Page 29
2nd October 1928
Page 29
Page 29, 2nd October 1928 — RUNNING, UPKEEP AND VERHAUL.
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Which of the following most accurately describes the problem?

FROM Beeston, Notts, " J.O.S.," writes us that he has had trouble with the upper half of the geareases on

the £1 and £2 type Thornyeroft lorries, of which he has charge. When dismantling these after a long period of use, he usually finds that the engine bearers have worn into the engine feet which are situated at the rear end of the gearcase. He finds this more pronounced on vehicles which run on solid tyres than on those which run on pneumatic tyres, owing to the extra vibration. The result of this is, of course, incorrect alignment.

He claims to have made a lasting improvement, as well as a remedy, by cutting away the aluminium, as shown in his sketch, and replacing it by steel plates shaped to fit the case and securing each of these by means of four or six screws of the countersunk type.

Care should be taken that the steel plates should bring the surface back to its original height. Our correspondent says that this is not a patched-up job, but that he considers it a distinct improvement on the original design. Whilst freely admitting that if the bolts were always properly tightened, there might be no trouble, he points out that bad usage should always be allowed for in design, as most vehicles will get badly treated at times.

When Dismantling the Gearbox of a Y.C.-type Daimler.

IN the work of dismantling the gear box of a LC.-type Daimler lorry, "W.H.A.," of Wolverhampton says that he has had difficulty in withdrawing the large ball race while the gearbox is in the frame. Driving it out by means of a hammer and punch bars is not to his taste, so he looked about for Some better plan.

The fork of the universal joint was used to bridge the opening by bearing on the metal surrounding the hole, the gearwheels pressing on the ball bearing, as shown in his sketch. A nut was then placed on the end of the spindle and the ball race came out without any damage being done to any part.

The Prevention of Pinking.

THE letter of A.R.D.," on the above subject, appears to have interested one of our correspondents, " D.D.S.," of St. Mary Cray, who agrees with " that by raising the cylinders by means of a layer of packing under the block the compression can be slightly reduced and the tendency to pink also reduced. He paints out, however, that this necessitates the removal of the cylinders and the making of a somewhat large gasket. After all this the job is not a very workmanlike arrangement when finished.

"H.D.S." tells us that he hag treated many engines for pinking; his method being to remove all the valve caps and to place them in the chuck of a lathe, boring as much of the metal away as possible, so as to enlarge the compression space. He warns us that the thread should not be shortened and that no metal should be less than -pe in. in thickness after boringaway, atherwis there may be a risk of the cap breaking up.

He points out that a more correct remedy for a tendency to pink is to have control of the ignition, without which he considers no vehicle is complete. Ha gives the following instructions for tit conversion of a fixed ignition to a co trollahle one. Remove the conta breaker cover and cam ring ; the latte may have to be gently prised DE T cam ring will be found to have a cm I Slot in it which engages in a Pin in t body of the magneto. On a fixed i. nition magneto this slot will be foun to be a close fit on the pin, so all has to do is to elongate the slut to length of about 1in. to permit the ea ring to be revolved through a erne angle.

The slut should be lengthened in t

running direction; this will then give a retarding variation. A Bowden_ wire or any simple means for working the control from the dash and a spring to return the cam ring to the advanced positionwill complete the job.

The Importance of Lubricating the Magneto.

FROM Bootle a correspondent, " I.R.,". tells u.S that he has had charge of some 70 magnetos for the past 10 .years, all running on heavy commercial vehicles, each of which he overhauls about every two years. When overhauling be finds that much damsee and costly renewal is caused by lack of lubrication, almost every driver having a dread of putting an oil-can near his magneto. Why, goodness. knows.

it is pointed out by " J.R." that clean oil is not a conductor, that a sparking plug will work well in clean oil and that it is the carbon whieh dirty oil contains which prevents a plug from working. Our informant states that where he had found trouble in one magneto due to over oiling he finds a dozen instances where trouble, such as torn-up bearings, is brought about bywant of oil.

The Collaring of Crankpins.

RECENT letters on the above subject have apparently interested many of our readers Who have the maintenance of engines entrusted to them. " F.H.," of Holloway, whilst fully agreeing with " S.B.F." that the method he suggests is the right one; points out that in the average garage. one seldom finds a lathe that is much good, or, at least, good enough to do a job of this kind properly.

!the method he has employed for years is quite a simple one and, as he suggests, can often be done in the time it would take to set up a lathe for cutting such an angular groove. He bends a round file or any piece of east steel so that it forms a bent chisel, with which he eau, by using a light haiiimer, chip out the groove. By softening, bending and rehardeniueb another routed file he is able to smooth up the groove.

A Smart Axle-repair Job. A READER, " W.B.," from Bathgate,

• West Lothian, writes to tell us how, during a busy week-end, one of the buses under his charge bad the had hick to break a ball-bearing on the outer end of the rear axle.

Eefore the vehicle could be attended to it had to run Some distance, with the result that the broken parts of the bearing damaged the thread on the tube.

Our correspondent had all the necessary spare parts but had no die with

which to recut parts, thread. Having a spare new nut he eat four slots by filing, so as to form a diemut. This be hardened in an open fire by means of some ease-hardening compound (prueslate of potash will do if no other preparation be to hand).

With this he revived the damaged thread and had the bus on the road within an hour of starting to make the die from the nut.

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Locations: Wolverhampton

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