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techtalk:ih:engmech02 [2020/08/24 18:13] hippysmack [Sub Documents] |
techtalk:ih:engmech02 [2021/07/02 05:14] hippysmack [Pinion Gear] |
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| ====== Camshaft Shims ====== | ====== Camshaft Shims ====== | ||
| - | * Camshaft shims (6769 & 6770), used to control maximum camshaft end play were discontinued in 1982 production engines. It was determined through engineering testing that an increase in the maximum allowable cam gear shaft end play does not contribute to an increase in noise or prove to be detrimental to component operation. ((HD Service Bulletin #M860 dated November 12, 1982 pg 1)) | + | *Per Service Bulletin #M-860, the shims for the cams are no longer suggested for use by the MoCo. ((HD Service Bulletin #M860 dated November 12, 1982 pg 1)) |
| - | * When reassembling engines after service or repair, it isn't necessary to re-install the camshaft shims. The cam gear shaft end play should be measured following the procedure in your FSM. Observe the minimum end play specs of 0.005" for all cam gears, except rear intake which is 0.004" min. end play. It is no longer necessary to measure __maximum__ cam gear shaft end play. ((HD Service Bulletin #M860 dated November 12, 1982 pg 1)) | + | *Camshaft shims (Part No. 6769 and 6770) used to control maximum cam gear shaft end play have been discontinued in production engines. \\ Engineering testing has determined that an increase in the maximum allowable cam gear shaft end play does not contribute to an increase in noise. \\ Nor does it prove to be detrimental to component operation. \\ When reassembling engines after service or repair, it is not necessary to reinstall camshaft shims. \\ Cam gear shaft end play should be measured following the procedure in the latest applicable Service Manual. \\ Observe the minimum end play specifications of .005" for all cam gears, except rear intake which is .004" minimum end play. \\ It is not necessary to measure maximum cam gear shaft end play. |
| + | * [[techtalk:miscres:miscres05#tsb_850-899|Click here]] to go to the TSB page in the Sportsterpedia. Click on the "Y" next to M-860 to download the service bulletin. | ||
| ====== Gearcase Cover ====== | ====== Gearcase Cover ====== | ||
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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 142: | 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. \\ | ||
| + | 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) ====== | ||
