IS LIKE THE LUNGS

NZ Truth, Issue 1212, 21 February 1929, Page 18

IS LIKE THE LUNGS

Your Engine Must Have Clean Air LONGER LIFE FOR MOTOR |iiitiuii!iiinnniiiiuiiiiiiiiHnHiiiuiMiuiiniiiiuuininiiiiuuiniiiiuiiiiniit»MuiMniuuinniunimiiiniMmHnuimuiimuimmimmimmuHmuiimummiiij

I Dust drawn m through the carburettor of a car, truck | | or tractor engine, causes rapid wear and the need of early | | replacement of valves, pistons and rings. § '

TJ*VERY tractor-owner who makes his Hi investment pay good dividends realises the importance of permitting only dust-free air to enter the carburettor.. Instances are on record where the top piston rings of tractors unprotected from dust have been worn out completely m less than ten days' use m a dusty field. High efficiency air cleaners are absolutely necessary to secure a satisfactory, length of life m a tractor. To the man who must get service out of his car, the air cleaner is of vital importance. The farmer, perhaps more than anyone else, has to use his car m fields and orchards and on unpaved roads where dust conditions are often extremely severe. For him the air cleaner is especially important. Most users of automobiles have taken it as a matter of course that after every few thousand miles of use

f!![li!!IIDil!i:i!!ll[||!!lin they would need to pay for grinding valves, re-boring cylinders, and putting m over-size pistons. It has not occurred to very many to question this need and its cause and to see if thiß good money might not be kept m the purse. Some have disregarded the garage man's advice 1 and have kept. on using the old. machine unrepaired even though it required three or four times as much oil as. at' -first and perhaps a half more petrol to keep it going. Eventually, when the wheezy engine can no longer be started, the owner may realise that he would have been money and time ahead if the rebore job had been done long before. ' But why are reboring and over-size pistons needed so often? Dust is the reason. Fifty-five per cent of the dust floating m the roads and fields is sand. The microscope shows that the particles are as sharp as the particles of the emery oi\ carborundum dust m the pastes used to grind, engine valves. . When we are out on a dusty road we hold our breath while we meet or pass another car. Our engine can't do that. It must , take its dose, of grit. Of course, some, of the dust will go out with the exhaust gas, but some will stick m the oil on the cylinder walls and will keep grinding away for hours and take off a toll of metal.

iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiuiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiniiiiiiiimitNiiiiis Laboratory tests have shown that if a film of clean oil is maintained between the parts of a bearing there will be no appreciable wear. ''. ■■ 7 ■ "■■-•■ The market affords several air cleaners that take out more than 90 per, cent, of the dust. Some of thes* highly efficient cleaners do not ap-. preciably affect the power and. "pick up" of the engine. . . All that are satisfactorily efficient as dust removers need servicing occasionally. ' . . One servicing m 5000 miles of ordinary running is 'enough for any of them. Some do not require attention more often than once a year or m 30,000 miles. None of those that are said to. "require no attention" are 'good . enough for the user who needs to get long ser-: vice and good economy from his motor. How may the ..motor owner know, whether the air cleaner on the carburettor of his engine is doing" a real job of air cleariing, or letting, a large;

lllilipilllPlM portion of the dust go on into the engine? Anyone able to^ use a screwdriver 1 and a pair of pliers may easily find outby this test. ; Just before you start on that dusty trip to the mountains or- that inspection trip, m which you will need* to follow other machines rather closely for 20 miles or more on earth roads,' take off the air cleaner and wipe clean the inside of the tube by which con- • nection is made to the air inlet of the. carburettor. Then coat the inside of the tube with ; a little cup grease or by wipingwith a rag soaked m clean engine oil and replace the cleaner. Make sure that the joint between cleaner and. carburettor is airtight! If it is not,- put " a bit of friction tape tightly around >it. When the trip is over take off the air-cleaner and see how your . finger looks after you have rubbed it around the inside of the oily tube. •■■ If the cleaner has done a good job there should be scarcely a trade of dust. If it is one of the make-believe cleaners there will be dirt a-plenty m •evidence. ■■-.-■'■ This test may fail if your carburettor construction and adjustment are such that it is possible for backfires to'blow gases back into the air cleaner to wash off the coating of oil. and dust.