Salt Lake Tribune | 1918-06-09 | Page 26 | Set of Valves of Vital Importance

SET DFyUyES"DF VITALJMPORTANGE Few Realize Need of Fre-j quent Adjustment of Lifters. ARE OFTEN NEGLECTED I ' 1 Best Engine Will Lose Power if Not Given Attention. i 1 t,.c h'-Moiu ri:aiifj'h tn importance of -orrt;i;i hHJuhI nifnt of the valve lid era, ' yrt t ho boat online in tho world will loae power if these arc not properly set. , Siri'.o thfy are i:Hiiiilly difficult to reach, '; duty to handle, and do not force them- s--lvf-s on the driver's attention, they are f nfi'lfcted until the trouble iecc-"f-s really ' Of course, if thoy Le;ome noisy the '! UnockiiiK la so noticeable that the owner is' forred lo make nrtjuHtmenLs imrne-iMalely. imrne-iMalely. Hut ordinarily tlif:e partH re-' re-' i-cive Hcant attention, and the loss of ' powtT i.H at t ri hu ted to cither the car- 1 buM'tor or ignition, until a thorough i. nvcrhaulirm' jf the motor leads to the 1 1 1 .sro very of I tie rc.i 1 I rouble. designer Intended, It is evident that the engine will lose power if both ends of a stroke are cut off. If the clearance is too small the engine will lose compression compres-sion and with it a great deal of power. This is due to thn fact that as the engine en-gine heats up tho valve stem lengthens. As tliev grow longer they use up the space between valve stem and valve lifter. If the space is too small the valve stem rests on the valve lifter. As it lengthens thn head of the valve is lifted off its seat in the cylinder, opening the valve and so losing the compression. It will he evident from this that valve clearance is one of the important things about a motor and one that should be borne in mind and Inspected whenever one looks for causes of lost powe ;: noisy, due to the tact that the space becomes too wide. As I hey rise they ' ive a hammer blow to the valve stems, -ausing a knock which may readily be heard. My stopping tho motor, removing l ho valve cover plates anil shaking them I up and down the ones out of adjustment ; may readily be located. i Examine Carefully. Somcllnics several are at fauit, so, while nhoul it, set all of them. Kxamine 1 the adjustment carefully to understand it, for much damage may be caused by ; twisting the wrong nut. One is locking , nut, which must be loosened first. The adjustment nut is then set to the right distance and tlie locking nut fastened, i The opening should approximate one- 1 sixty-fourth of an inch for exhaust valves iind three-one-thousandths of an I inch for iniet valves. Use an ordinary j husiness cards as a gauge for tho exhaust ' vaivc clearance. If posslblo to have a curd the right thickness, it is best to ; do so. This can be readily measured with ! a micrometer. A piece of note paper is , about right for inlet valve clearance. It will be found difficult to adjust the 1 space correctly unless the following diree- j lions are followed: Place the desirod , i gaugo in space anil screw adjusting nut until it touches. Now unscrew It either one-sixth or one-fourth turn. Then lock 1 Ihe nut that holds It tn place. Try the .1 gaue and sue if it has Just a slight i Mctlon. Reason for Unscrewing. 1 The reason for unscrewing tho adjust- ; ing nut is that tho locking nut pushes , ! it up and so throws the adjustment out , of true. If the clearance becomes too , i great tho valves open late and close ! early. ' ; Since they should movo exactly as the