44. — Care of the Yorkshire Boiler.
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To keep the boiler free from scale and to avoid corrosion, boiler compositions, such as Boilerine, may be used to ,assist in removing the sediment, but in any case it is advisable, when finishing the day's ,work previous to washing out theboiler, to scald iabout 3 lb. of common soda in a bucket of water, afterwards injecting it into the boiler with full steam !pressure, and allowing it to cool down gradually. If 'this process is carried out about every three months, no difficulty will occur in keeping the boiler clean. Mhen commencing to wash out the boiler, remove 'all the mud-hole covers and, occasionally, the boiler inspection plugs. Then take off the safety valve boiler flanges and commence at the top with a good 'force of water, using a bent pipe attached to the water hose, so that all the tubes. the 'inner portion of the boiler, and the outer shell of the firebox are easily reached. The colour of the water coming out of the mud holes is a good indication as to when the boiler is clean. • After the washing-out is completed a 10-15 minute examination of the firebox and boiler is always advisable. Inspect all stays and keep a sharp look-out for any signs of bulging or alteration in shape of the firebox and boiler shell. If the tubes leak constantly and expanding is found not to improve them, thoroughly clean one in every three, and if those cleaned are found to be badly pitted or corroded it is as well to have the boiler retubed. It is advisable to obtain, expert advice in this connection as wagons have been sent in to the Yorkshire works for new fireboxes when slight repairs only were necessary.' Fusible plugs should be examined during or after washing out, and changed every six months. To keep the steam regulator from the boiler to the engine in first-class condition it is an advantage to keep a spare valve and Seating in stock. These can be changed quite easily with those on the wagon, and the worn valve and seating can be refaced for a future' occasion.
45.—Starting the Napier On the later type Napiers fitted with -Solex carburetters, a sleeve is fitted ever the airtake, as shown in the illustration. This sleeve reduces the amount of air passing by the jet, thereby increasing the suction and consequently the amount of petrol which is drawn by the engine. For starting purposes, when the engine is cold this air sleeve should be in the closed position, that is, closing the holes in the inner sleeve. On the B72A type, the sleeve is connected to a rod which passes through the radiator and can be operated without opening the bonnet. In the older types it was necessary to open the bonnet and to operate the sleeve by hand. When the engine is started and thoroughly warmed up, the air sleeve should be opened to the required amount, the extent depending upon the atmospheric conditions prevailing, i.e., on a very warm day it should be only partially opened. in any case it should be open to the fullest extent possible, as. if the air is unduly restricted, too rich a mixture will be utilized and the fuel consumption will be unduly great.
46.—Lifting Leyland Differential.
A small but useful device which renders the lifting of the Leyland differential a matter of little difficulty, even when the latter is covered with thick oil, consists of a small hook with a turned-up-end, which can be passed through one of the holes in the differential easing, close to the crown wheel. The shape of the hook is such that it fits easily between the teeth of the latter, and at the same tigrne its position enables the differential to be balanced properly whilst lifting. The actual lifting can be done by two men with a cross-bar, or with a crane.