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How to Keep Your Lorry Fit.—VII.

28th September 1916
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Page 5, 28th September 1916 — How to Keep Your Lorry Fit.—VII.
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The Well-known Halley 35 h.p, Three-ton Chain-driven Chassis Forms the Subject of Our Seventh Article.

How to take care of the Halley chassis was very fully described by us in September, 1914. Drivers of this make of vehicle who would like

to refer to that series of articles , would do well to apply to Halleys Industrial Motors, Ltd., Yoker, Glasgow, for a copy of a reprint from it. As there are now so many new drivers on the road, we need make no apology for drawing attention to a few of the most salient points therein described.

Halley chassis are of the standard type, that is to say, they incorporate a four-cylinder engine placed under a bonnet, a clutch, clutch shaft to gearbox, within which is also contained the differential and the main bevel gears, the final drive being by roller chains to sprockets on the rear wheels.

Engine Requires Most Attention.

In. such a vehicle, for obvious reasons, the engine requires the most of what little attention is needed. The valves, for example, require grinding in • this applies more particularly to i the exhaust valves, which should be looked to about once every 1000 miles or thereabouts. After grinding the valves, the amount of clearance between valve stein and tappet should have attention. When the tappet is free in its guide ..ahd the valve presumably seated, there should be a clearance between tappet and valve stem equal to the thickness of the ordinary visiting card, neither more nor less • if more, the

effect is to shorten less; period of opening of the valve and thus

lessen the efficiency of the engine— if inlet valve, because it diminishes the amount of combustible gas induced, and if exhaust because it does not allow of a sufficiently free escape of the burnt gases. If the clearance is less than the amount stated, there is a chance that the valve may lengthen when hot to such an extent that it does not close.

On Halley machines the Zenith carburetter is fitted. New drivers and those not well acquainted with the' Nei requirements of an internal-combustion engine are advised to leave this alone. If they feel competent, by reason of a certain mechanical aptitude, to adjust the . carburettor and hope thereby to obtain better results in respect of fuel economy, they would do well, first of all, to get into communication with the Zenith Carburetter 0o, of 17, Hart Lane, London, E.C., asking them for a. booklet dealibg with the fitting and adjustment of the Zenith carburetter.

Don't Touch the Governor.

The engine control is by hand lever and accelerator pedal, with an additiohal regulation by means of a centrifugal governor. The object of this fitting is to prevent the engine running at more than a set number of revolutions per minute. Excessive speed causes undue vibration, tends to loosen screwed fastenings, and to accelerate tho rate of depreciation of the chassis. The adjustment of this governor should not be touched unless some alteration is authorized by the owner of the wagon.

The ignition is by high-tension magneto, and on some vehicles an

additional arrangement for easy starting purposes is provided. With regard to the magneto, this requires very little attention ; care should be taken not to over-oil it. At infrequent intervals, the contact-breaker platinum points should be examined and kept clean and flat. Occasionally, also, it may be advisable to remove the distributor disc and to clean away any particles of dust or carbon which may have accumulated thereon. It sometimes happens that, when new, the fibre lining of the contact breaker arm swells with the heat, and does not permit free movement. Polishing the pivot pin with a piece of fine emery cloth will free this. Oil should not be applied. The contact breaker should be set to open not more than half a millimetre, or little over a sixty-fourth of an inch.

The cooling-water circulation is effected by means of a centrifugal pump. This is an item which occasionally requires care. The stuffing gland of the spindle should be kept packed tightly, and when' on occasion, 4-1 is desired to clean the pump itself, the cover can be swung back after the nuts have been removed from the studs. A brown paper joint is utilized between this cover and the face of the pump ; when refitting care should be taken that the small drain hole at the bottom of the main water channel is not blocked.

Clean Your Radiator.

The radiator is of the type with cast top and bottom boxes, and a central cooling apartment com posed of plain or gilled vertical tubes. It is quite a simple matter on the shed day to remove the top and bottom headers and thoroughly to clean them and the Inside of the tubes.

The fan belt should be kept reasonably tight, and any adjustment that may be necessary _here may be accomplished by revolving the eccentrically-carried spindle in its bracket. After any such adjustment has been made the locking nut at the back should be carefully replaced and screwed up tight.

The Halley clutch is a plain fibrelined cone working inside the flywheel. The spring, which is a cen

trally-disposed one and totally enclosed, is adjusted by means of a pair of lock-nuts to which access is obtained through gaps in the central sleeve after the removal of the dirt cover which is normally clamped into position. When this clutch wears it enters the flywheel to a greater depth, and the clutch pedal is then found not to occupy

the same position -with regard to the footboards as it did when new ; it may be restored to that position by altering the screwed portion of the withdrawing gear and afterwards locking it up securely.

Adjust Driving Chains Evenly.

When adjusting the driving chains care should be taken that the adjustment is equal on both sides. They are adjusted correctly if, when the upper portion is tight, the lower portion can. be moved an inch and a half or so down in a vertical direction. As a guide to when it is advisable to remove a link rather than adjust further, inspect the rear spring back shackles : these should not pass the vertical position when the chassis is light. It should hardly be necessary, even to the newest of drivers, to advise him occasionally to attend to the adjustment of his brakes. With regard to the footbrake, if a loose braking effect is noticed notwithstanding that the adjustment is correct, it is probably due to grease on the drum. This should be cleaned off. After adjustment, care should be taken that both shoes are clear of the drum in the off position, and that both are in contact when the brake pedal is de. pressed. The same remarks apply as concerning the adjustment and upkeep of the side brakes.

Lubrication.

Now as to lubrication. The engine is the prime consideration

in respect of the efficiency of the whole chassis, and the need to ensure its proper lubrication has

met with the most careful consideration at the hands of the designers. It rusts with the user to see that these means are given

every opportunity to operate satisfactorily. The circulation of the oil in the engine-ease may be described as follows : the troughs below the big ends are first of all filled, and then oil overflows from them into the sump via a special filter, whence the eccentric twin-vane pump is able to suck it up.

The first delivery from the pump is to the tell-tale on the dash, then down to a branch, one arm of which of a cock to test the level in the crankcase, a plug is provided. The leads to the centre and forward bearings and the other to the back journal. The surplus goes via Iced pipe over the troughs. Instead oil is distributed in the timing gearcase by the skew-gear, which picks it up after it is delivered from the pump into a pocket.

. Gearbox.

The gearbox should be filled to such an extent that the level of the oil is within an inch below the shafts. There is an oil-retaining ring on the box With a fibre washer where the propeller-shaft drive enters the box. The lock-ring here mist be kept tight. Our lubrication chart shows specially the methods which must be adopted to keep the chains properly lubricated, and, in particular, we recommend the boilin., of the.chains in hot tallow and graphite at intervals of net more than 5000 miles, after they have been properly cleansed from grit by soaking and brushing in a bath of paraffin.

. The little instruction book issued by Halley's Industrial Motors, Ltd., usefully summarizes the principal lubrication and other duties of the driver in respect of one of these chassis.

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People: Hart Lane
Locations: Glasgow, London

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