Differences
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techtalk:ref:genmsr05 [2020/05/29 03:59] hippysmack [Brakes] |
techtalk:ref:genmsr05 [2020/08/22 20:53] hippysmack [Cams / Cam Cover] |
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| Too much end play, worn cover / case bushings or case roller bearings (respectively). \\ | Too much end play, worn cover / case bushings or case roller bearings (respectively). \\ | ||
| Noise can also come from an unmatched cam set including idler gear (if equipped). \\ | Noise can also come from an unmatched cam set including idler gear (if equipped). \\ | ||
| + | |||
| + | **What causes cam gear noise?**: \\ | ||
| + | Whenever a roller lifter in a Sportster engine passes through maximum cam lift, the forces on the cam gear teeth change direction. ((dragstews of the XLFORUM http://xlforum.net/forums/showthread.php?t=555974&page=3)) \\ | ||
| + | If there is more than .002" backlash, the change of force and direction will result in an audible "click" as the backlash moves from one side of the tooth to the other. \\ | ||
| + | Gear noise always occurs at idle and lower engine RPM. Stock EV Sportster cams are made with different gear sizes. \\ | ||
| + | They are color coded by size and selectively fitted to engines at the factory to a minimum backlash which results in reduced gear noise during engine operation. \\ | ||
| + | Andrews Products cam gears for EV Sportsters are made with gears in the middle of the size ranges so there is only a small chance of cam gears fitting too tight. \\ | ||
| + | Cam gears which have excess backlash may rattle or “click” during operation. This clicking sometimes sounds like lifter noise. \\ | ||
| + | Unlike whining gears, rattling gears will not cause gear tooth failure or engine damage. If you don't mind the noise, it won't cause any engine problems. \\ | ||
| + | Gears which are operating without enough backlash (fitted too tightly) will whine during operation. \\ | ||
| + | This condition is serious and can cause localized gear overheating, tooth surface failure and engine damage. \\ | ||
| + | Cam gears which fit too tight must be corrected with smaller size cam gears. \\ | ||
| ===== Lifters ===== | ===== Lifters ===== | ||
