Show t tI I HOW TO TRACE TROUBLE In tracing carburetor trouble ot of any kind regardless of its time can always be saved by rol- rol following fol following ot of lowing a process elimination eliminating the units which are found when tested to tobe he be all right In locating carburetor troubles these can b bo be divided Into various groups These can all 1111 be traced by certain symptoms Thus toon lean ft II mixture will cause backfiring and stall tho the engIne lne when the throttle Is opened cud sud- suddenly sud suddenly denly 7 Misfiring when due to car car- car Is caused by unequal fuel ruel distrIbution refusal to start starts Is due to II a a lack of of mixture at tho carburetor Trio The above trouble troubie frequently present ea es In cold weather and are more moro fre- fre frequent fre frequent quent than those mentioned below a as one is always Interested In ob- ob obtaining ob obtaining taming the tho maximum economy and andI I likely to favor too lean a 0 mixture duo due to le ks and too rich richa a mixture are aro more apt to be caused Aused by natural wear of the the fuel ruel 8 stem I 1 The fIrst first stepin stop step n in shooting carburetor carburetor trouble is to test the engine running and noting Its gen gen- gen general eral action to establish the symptoms symptoms toms To do this testing it lq many times necessary to race the engines engine but this should be a henc er I possible as it will event event- eventually lead IMd to troubles of great r consequence such as loose bear bear- bear Ines noisy engine etc etcA A careful study of or tho the symptoms will readilY lead one to the general nature or of orthe the trouble and then permit a aB B search for the Careful attention to details while makIng the tho test Is essential and Will In the end result in the defInite definite definite nite location and repair of the tho trouble Trouble should should neer ne ne er be looked for in the system system tem tern unless the tile engine engino is warm ant anJIn antin anIn In good running condition other other- otherwIse otherwise otherwise wise Correctness of any carburetor carburetor carburetor adjustment can be deter deter- determIned determined determined mined by the the idling condition ot of the tho engine Too lean a speed low low adjustment will cause couse the engi engl engle ie e eto to Idle poorly and it will often orten die after running spasmodically An extremely rich adjustment of or the thelow thelow thelow low speed at Idling speeds will pro pro- produce pro produce duce duco a very 1 pungent odor to the ehaust Too rich a mixture itt It hIgh speed produces a black smoke nt at the exhaust and too lean a mix ml- mis- mis mixture ture will cause backfiring through the carburetor The speed high high adjustment is correct when the engine faintly Indicates backfIring With retarded spark which disappears disappears pe pears rs when the tho spark is advanced When the above aboe symptoms pres pres- present pres- pres present present ent themselves one should not jump at conclusions and nd assume that the tile carburetor adjustment h hat i at fault for these conditions can also be he set st up by mechanical d de- de de defects frets Any restriction of or the fuel low flow through the carburetor will cause backfiring and Irregular ular running this Is also true of or QI leas leaks at the manifold or raise valie e stems A L leaky float loat or worm float valve will disturb the adjustment of the mixture making it more rich gich and thus cause causo a sluggish action of ot the engine Wear In the losers Ie ers which connect the strangler Ier valve at th the carburetor carburetor carburetor to the choke or d dash sh control will cause hard starting and a II rich mixture The carburetor adjustment may be maybe wrong but this cannot bo be pro cn en until the engine Is running therefore the logical point to start with nth Is the fuel supply Ex- Ex Examine Ex Examine amine the rear tank for gasoline OI open en the loner homier drain of or the tho vacuum tank and Insert a wire in iii inthe lathe the OI opening It gasoline doe doca not flow as sediment many times will clog this outlet Next lift it the lot float float alio salso ahe of or the carburetor for tor a few seconds This systematic examina eXAmina- eXAmination examination tion of or these units will pro prose pro e the presence of fuel tuel In the float loat cham chain chamber chamber ber and eliminates the tho possibility ot of major troubles permitting an analysts analysiS ot or tho the minor details details- details Automobile Digest |