Show listening rod detects when a noise occurs in the timing gears it can easily be distinguished by a lout loud ringing or humming sound and can nally easily be b detected by sounding the timing gear case with alth a listening 11 rod or stethoscope it is generally caused by worn vorn bearings bear laRS or gear teeth and in some cases by wearing which 5 causes the gears to mesh im g properly it Is frequently eaf g dent dene niter after the main bearings I 1 have been rent re fitted ted since this chis may any change the gear centers y and cause the gear teeth to g mesh deeper g 0 |