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techtalk:ih:engmech02 [2020/08/25 16:37] hippysmack [Camshaft Shims] |
techtalk:ih:engmech02 [2021/07/02 05:22] hippysmack [Pinion Gear] |
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| ====== Pinion Gear ====== | ====== Pinion Gear ====== | ||
| + | \\ | ||
| **Compatibility** | **Compatibility** | ||
| + | 1957-1985 pinion gears have 18 teeth and splines to match the splined pinion shaft. \\ | ||
| + | 1957-1976 pinion gears have 4 splines. \\ | ||
| + | 1977-1985 pinion gears have 6 splines. \\ | ||
| |Part#|Year Models| | |Part#|Year Models| | ||
| Line 143: | Line 147: | ||
| |24061-74 (black)|:::| | |24061-74 (black)|:::| | ||
| + | The 57-76 pinion gear needs to be a tight fit. However, it's a common problem to find them loose on a used engine. ((Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1072235)) \\ | ||
| + | The trick in selecting the right fit part during assembly. The gear is supposed to be "size for size" with the major diameter of the shaft splines. \\ | ||
| + | The press actually is between the sides of 1 male shaft spline and it's matching female in gear. \\ | ||
| + | There is 1 bigger spline so the gear can index for cam timing. The press spline is the one opposite the bigger one. \\ | ||
| + | The bad news is the shaft wears before the gear. The XL gear is beefier where the pump drive gear hits the back of the pinion gear. \\ | ||
| + | It's beefier because HD also had these failures. \\ | ||
| + | However, leaving the gear loose makes you 1 of 80% of Ironhead riders. Worse side effect is non stop "tappet noise". It can be heard even just pushing the motor over with kicker. \\ | ||
| + | It's usually not "destructive" problem to leave it as is and you can't use an adhesive to "glue" the pinion gear on. \\ | ||
| + | Click on any pic below to enlarge: \\ | ||
| + | | 1957-1976 Pinion Gear. ((photo courtesy of Ebay seller, Evil Genius M/C Parts. [[https://www.ebay.com/str/evilgeniusmcparts?_trksid=p2047675.l2563|Link to Ebay Store]] )) || | ||
| + | |{{:techtalk:ih:engmech:pinion_gear_pic2_24011-37_by_evilgeniushd1936.jpg?direct&300|}}|{{:techtalk:ih:engmech:pinion_gear_pic1_24011-37_by_evilgeniushd1936.jpg?direct&300|}}| | ||
| + | |||
| + | | 1977-1985 Pinion Gear (24057-74) ((photos courtesy of Ebay seller, Robison Motorcycles [[https://www.ebay.com/str/robisonmotorcycles?_trksid=p2047675.l2563|Link to Ebay Store]] )) || 1977-1985 Pinion Gear (24056-74) App. Dims ((photos courtesy of Ebay seller, Robison Motorcycles [[https://www.ebay.com/str/robisonmotorcycles?_trksid=p2047675.l2563|Link to Ebay Store]] )) | | ||
| + | |{{:techtalk:ih:engmech:pinion_gear_24057-74_pic2_by_robisonmotorcycles.jpg?direct&300|}}|{{:techtalk:ih:engmech:pinion_gear_24057-74_pic1_by_robisonmotorcycles.jpg?direct&300|}}|{{:techtalk:ih:engmech:pinion_gear_24056-74_app_dims_by_robison_motorcycles.jpg?direct&300|}}| | ||
| ====== Tappets (Lifters) ====== | ====== Tappets (Lifters) ====== | ||
