Show DOPE BY BYi i- i MERCER JORDAN T I SERVICE M MAN ANI r Jack Jact shop manager of oC tho distributors distributors dis dis- Mercer Jordan Sales company compan of or tho ho Mercer and antI Jordan Joran cars Is regarded as one of or the best bost I Y t posted mechanical experts In the local loca ti 1 r. r field and what ho he has to sa say here on when and h now how w to grind valves es will doubtless provo prove of great Interest to local motorists and drivers It l Is quite well known b by man many moI motorists motorists mo mo- I that not all engines run better after alter after the valves cs have havo been ground around a fact tact which Is 18 attributed to the un sar sary grinding which makes for leaky I valves es The writer In his article points out how ho one nut may distinguish a that leaks from one ono that does docs not and md 4 tells how ho only the fault faulty ones should be ground He Hc says sas On a 3 properly I v I cooled en engine lne and one where the valves M arc prop properly rl timed It ma may be accepted as a general rule that valves which 4 t arc S evenly c looted over o and therefore have havo perfectly black heads are holding holdIn holding hold hold- In ing while those which arc red or brownl brownish h on top tOil or show the metal meta plainly without t a covering co of soot or carbon arc are leaking By Ry B observing observing- the tops of tho valve ah heads beads as ns soon as the l cylinder head I n is removed remo and S then carefully the the face o of the t valve aho and the tho seat seal one will ilI quickly I learn to t tell ll what Is needed t The Time reason for the difference In Inthe the looka of the tops Is simple and md ob- ob x ious upon a a little thought During the power stroke of the piston th thE c. c burning gases s arc under high pressure w i If f there I Is the thc slightest leak at an any point around the face of oC the valve ahe the thc ther r gases ase will force torce their way through at terrific speed and carT carry awa away an any carbon which ma may have ha been formed p J on the he top of tho the c valve near the leak as well as on the casting near tho the valve seat leaving lea the metal around t t the leak entire entirely clear elcar of oC soot or carFi cart car- car i F-i- hon bon Not ot only will the escaping gas fi r- r carry a away all nil carbon near the leak but will also actually wear aWa away the J metal l itself if not attended to A valve which Is allowed to lc leak l for fora r- r a long time will frequently show quite OJ a lilt c r p od d h. h b th 1 I. I rot J c UJ y Hie e u gases in 1 1 I rushing through the opening In much t the same Ramo way ny as the gases from the thc L L' L burning powder charges cs In a high high- JL power rifle or cannon gradually erode the metal of ot the rifle or cannon barr barrel 1 l b by escaping past tho the projectile beCort before ZE t It gets bets fully under wa way The Thc paths S 'S n cut b by these gases In ht either case look almost as though the modal had been melted out and there is Ig undoubtedly a c certain amount of or melting out and there Is undoubtedly a certain amount of melting of the metal brought about by the hot gases gase The Thc high temperature of the thc escaping escapIng escaping ing gases also alao causes a different color of ot the metal around a leak leaky valve alve In Inman Inmany inmany man many cases Very frequently a a. leak leaky valve will have hac a reddish appearance like burned clay or like liko a furnace grate rate often otten shows after aCter being beinS' under a avery very hot fire for some somo time This f. f la ls lanot not an infallible rule for tor detecting a a. leak leaky valve e but on many engines it itIs f Is a i iCO very CO reliable Indication f If I New ew York Fork Sept 13 ne n. Revocation evocation aHon o of the licenses or Texas I t- t t. t two grain KI-aln companies com corn comI panics was announced tonight b by the United States food administration The Thc II H. S S. S Watson atson company compan of or Longview Long Lon view and the ho Smith Officer Grain compan company com corn 1 pan pang pany of Fort Worth orth were found guilty of oC unfair and deceptive practices and other violations |