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techtalk:evo:engmech01 [2020/08/02 02:54] hippysmack [Crank Pin] |
techtalk:evo:engmech01 [2020/08/22 21:13] hippysmack [Pinion Shaft Runout] |
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| ===== Pinion Shaft Runout ===== | ===== Pinion Shaft Runout ===== | ||
| + | Check to see if your crank is out of true. The idea is to measure how much the end of the pinion shaft wobbles. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=1578649)) \\ | ||
| + | Up to .005"-.006" out there at the end of the shaft doesn't propose a huge problem. Most motors you measure will show this much. \\ | ||
| + | But above that is not good. Crank spread is a reality of racing these bikes. The flywheels want to spread apart on the side opposite the crankpin. \\ | ||
| + | When they do, the pinion shaft wobbles. You get real bad wear on the oil pump drive gear (this is why Buell went to a bronze drive gear). \\ | ||
| + | Harley never put it in the XL's because they're lower powered and it's less of an issue. But still sometimes they grenade and make a mess. \\ | ||
| + | Pinion shaft wobble also causes teeth to break off the pinion gear, and the pinion bushing to wear, and cam bushings to wear. \\ | ||
| + | To confirm pinion shaft runout dims, make the measurement as in below. \\ | ||
| + | |||
| |Attach a scrap piece of metal to the outside of the gearcase and position a gauge holder on it so it won't move while turning over the engine. ((photos by anachris of the XLFORUM ))||| | |Attach a scrap piece of metal to the outside of the gearcase and position a gauge holder on it so it won't move while turning over the engine. ((photos by anachris of the XLFORUM ))||| | ||
| |{{:techtalk:ref:tools:checking_pinion_shaft_runout_1_by_anachris.jpg?direct&300|}}|{{:techtalk:ref:tools:checking_pinion_shaft_runout_2_by_anachris.jpg?direct&300|}}|{{:techtalk:ref:tools:checking_pinion_shaft_runout_3_by_anachris.jpg?direct&300|}}| | |{{:techtalk:ref:tools:checking_pinion_shaft_runout_1_by_anachris.jpg?direct&300|}}|{{:techtalk:ref:tools:checking_pinion_shaft_runout_2_by_anachris.jpg?direct&300|}}|{{:techtalk:ref:tools:checking_pinion_shaft_runout_3_by_anachris.jpg?direct&300|}}| | ||
