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techtalk:evo:engmech09n [2021/07/28 01:43] hippysmack [Replacement Rubber Options] |
techtalk:evo:engmech09n [2024/01/04 01:52] hippysmack |
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| In addition, there is a pivot shaft that supports the swing arm bearings / bolts on the outside, and goes through the rear mounting lug on the tranny case. \\ | In addition, there is a pivot shaft that supports the swing arm bearings / bolts on the outside, and goes through the rear mounting lug on the tranny case. \\ | ||
| If the pivot shaft is loose in the rear mount lug, it will need to be replaced also. \\ | If the pivot shaft is loose in the rear mount lug, it will need to be replaced also. \\ | ||
| - | Lube and properly tightening steering head bearings are also important part of the process. ((XLXR http://xlforum.net/forums/showthread.php?t=1526368&highlight=motor+mounts&page=3)) | + | Lube and properly tightening steering head bearings are also important part of the process. ((XLXR https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/rubber-mount-sportster-motorcycle-talk-2004-2006/140794-check-motor-mounts-and-swing-arm-bearings-asap/page3?t=1526368&highlight=motor+mounts&page=3)) |
| You can raise the bike on a jack and see engine swing better when pushed than while sitting on the tires. \\ | You can raise the bike on a jack and see engine swing better when pushed than while sitting on the tires. \\ | ||
| Line 145: | Line 145: | ||
| If you pull the rear mount apart, you may want to inspect the pivot shaft for wear and rust. You can pull the assembly apart at the same time you change the rear tire. \\ | If you pull the rear mount apart, you may want to inspect the pivot shaft for wear and rust. You can pull the assembly apart at the same time you change the rear tire. \\ | ||
| - | {{:techtalk:evo:susp:rear_pivot_bolt_wear_by_cosmo_kramer.jpg?direct&300|}} {{:techtalk:evo:susp:rear_pivot_bolt_screw_wear_by_cosmo_kramer.jpg?direct&300|}} \\ | + | The pivot shaft has metal-to-metal contact on the shoulder where it pushes against the motor mount and all along the hole going thru the motor mount itself. \\ |
| - | The pivot shaft has metal-to-metal contact on the shoulder where it pushes against the motor mount and all along the hole going thru the motor mount itself. The groove in the pivot shaft to the right is from contact with the backing plate on the throttle side isolator. ((photo by Cosmo Kramer of the XLFORUM http://xlforum.net/forums/showthread.php?t=473423)) The groove was most likely worn in by movement in the vertical axis (as the groove was on the bottom side of the shaft), and has nothing to do with lateral play of the swing arm. ((XLXF of the XLFORUM http://xlforum.net/forums/showthread.php?t=473423&page=3)) Since the hole in the backing plate is larger than the pivot shaft, the backing plate is not supposed to touch the pivot shaft. However, this may be one of the things that happens over time as the rubber gets weak and moves around a bit more. It is an extremely tight fit going through the motor mount itself (machined shaft and mating hole). On the shaft below, there was no wear where the pivot shaft goes through the rear motor mount. The only wear was where the isolators contact the shaft with the heaviest wear on the throttle side. The witness mark was nearly all the way around the pivot shaft. On the clutch side, there is a very faint mark from where the rubbermount backing plate would be hitting the bottom of the pivot shaft (closest to the ground where the weight would be resting on). Dirt bike suspension bolts can be much worse. Enough wear will cause excessive play in the swing arm, and then the rear wheel will not track straight because drive belt tension will twist the swingarm so the tire points to the left. \\ | + | In the pics below, the groove in the pivot shaft to the right is from contact with the backing plate on the throttle side isolator. \\ |
| - | \\ \\ \\ | + | The groove was most likely worn in by movement in the vertical axis (as the groove was on the bottom side of the shaft). \\ |
| - | {{:techtalk:evo:susp:rusty_rear_pivot_bolt_by_cosmo_kramer.jpg?direct&300 |}} {{:techtalk:evo:susp:07_rear_motor_mount_22_by_cosmo_kramer.jpg?direct&300 |}} Water can get between the isolators and the pivot shaft and cause it to rust. ((photos by Cosmo Kramer of the XLFORUM http://xlforum.net/forums/showthread.php?t=473423)) The rust will only get worse as time goes by (especially if you live near the ocean). ((XLXR of the XLFORUM http://xlforum.net/forums/showthread.php?t=473423)) Rust can cause long term problems because it will eventually cause too much swingarm play. Guys who live in places like Florida will have rust problems sooner than the rest of us. You can sand blast all the rust off, use sand paper or a wire brush to remove the rust. Then coat the shaft with a good marine water proof grease. Paint will only rust through again. \\ \\ \\ \\ \\ \\ | + | And has nothing to do with lateral play of the swing arm. ((XLXF of the XLFORUM http://xlforum.net/forums/showthread.php?t=473423&page=3)) \\ |
| + | Since the hole in the backing plate is larger than the pivot shaft, the backing plate is not supposed to touch the pivot shaft. \\ | ||
| + | However, this may be one of the things that happens over time as the rubber gets weak and moves around a bit more. \\ | ||
| + | It is an extremely tight fit going through the motor mount itself (machined shaft and mating hole). \\ | ||
| + | On the shaft below, there was no wear where the pivot shaft goes through the rear motor mount. \\ | ||
| + | The only wear was where the isolators contact the shaft with the heaviest wear on the throttle side. \\ | ||
| + | The witness mark was nearly all the way around the pivot shaft. \\ | ||
| + | On the clutch side, there is a very faint mark from where the rubbermount backing plate would be hitting the bottom of the pivot shaft. \\ | ||
| + | (closest to the ground where the weight would be resting on) \\ | ||
| + | Dirt bike suspension bolts can be much worse. Enough wear will cause excessive play in the swing arm. \\ | ||
| + | And then the rear wheel will not track straight because drive belt tension will twist the swingarm so the tire points to the left. \\ | ||
| + | Water can get between the isolators and the pivot shaft and cause it to rust. ((photos by Cosmo Kramer of the XLFORUM http://xlforum.net/forums/showthread.php?t=473423)). \\ | ||
| + | The rust will only get worse as time goes by (especially if you live near the ocean). ((XLXR of the XLFORUM http://xlforum.net/forums/showthread.php?t=473423)) \\ | ||
| + | Rust can cause long term problems because it will eventually cause too much swingarm play. \\ | ||
| + | Guys who live in places like Florida will have rust problems sooner than the rest of us. \\ | ||
| + | You can sand blast all the rust off, use sand paper or a wire brush to remove the rust. \\ | ||
| + | Then coat the shaft with a good marine water proof grease. Paint will only rust through again. \\ | ||
| + | |||
| + | {{:techtalk:evo:susp:rear_pivot_bolt_wear_by_cosmo_kramer.jpg?direct&300|}} ((photo by Cosmo Kramer of the XLFORUM http://xlforum.net/forums/showthread.php?t=473423)) {{:techtalk:evo:susp:rear_pivot_bolt_screw_wear_by_cosmo_kramer.jpg?direct&300|}} ((photo by Cosmo Kramer of the XLFORUM http://xlforum.net/forums/showthread.php?t=473423)) \\ | ||
| + | |||
| + | {{:techtalk:evo:susp:rusty_rear_pivot_bolt_by_cosmo_kramer.jpg?direct&300|}} ((photo by Cosmo Kramer of the XLFORUM http://xlforum.net/forums/showthread.php?t=473423)) {{:techtalk:evo:susp:07_rear_motor_mount_22_by_cosmo_kramer.jpg?direct&300|}} ((photo by Cosmo Kramer of the XLFORUM http://xlforum.net/forums/showthread.php?t=473423)) \\ | ||
| ===== Replacement ===== | ===== Replacement ===== | ||
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| | Rear isolator locating tabs. ((photos by 04xl1200c of the XLFORUM http://xlforum.net/forums/showthread.php?t=1701136&page=11)) || | | Rear isolator locating tabs. ((photos by 04xl1200c of the XLFORUM http://xlforum.net/forums/showthread.php?t=1701136&page=11)) || | ||
| |{{:techtalk:evo:susp:rear_isolator_tabs_in_place_1_by_04xl1200c.jpg?direct&300|}}|{{:techtalk:evo:susp:rear_isolator_tabs_in_place_2_by_04xl1200c.jpg?direct&300|}}| | |{{:techtalk:evo:susp:rear_isolator_tabs_in_place_1_by_04xl1200c.jpg?direct&300|}}|{{:techtalk:evo:susp:rear_isolator_tabs_in_place_2_by_04xl1200c.jpg?direct&300|}}| | ||
| + | |||
| + | ====== Rear Pivot Shaft ====== | ||
| + | |||
| + | The shoulder on the shaft sits flush with the outside edge of the engine. \\ | ||
| + | The pivot shaft is not a press fit into the bore but there is some tolerances involved. \\ | ||
| + | One the backing plate is removed, the shaft may not easily be pulled out. \\ | ||
| + | You should be able to remove it by simply hitting the opposite end with your hand or rubber mallet (after wiping any rust /debris off the shaft). \\ | ||
| + | The shaft should turn freely once the retainer plate is removed but there is no "play" as the tolerance is close to an interference fit condition. \\ | ||
| + | The shaft is not tapered but there is a shoulder on the shaft and there is a recessed shoulder on the engine itself. \\ | ||
| + | Below is a picture of the clutch side of the rear engine mount and you can see the machined shoulder on the inside. \\ | ||
| + | There is no bushing in the hole, it is just machined through. | ||
| + | |||
| + | {{:techtalk:evo:susp:07_rear_motor_mount_23_by_cosmo_kramer.jpg?direct&300|}} ((photo by Cosmo Kramer of the XLFORUM http://xlforum.net/forums/showthread.php?t=473423)) {{:techtalk:evo:susp:07_rear_motor_mount_15_by_cosmo_kramer.jpg?direct&300|}} ((photo by Cosmo Kramer of the XLFORUM http://xlforum.net/forums/showthread.php?t=473423)) {{:techtalk:evo:susp:07_rear_motor_mount_14_by_cosmo_kramer.jpg?direct&300|}} ((photo by Cosmo Kramer of the XLFORUM http://xlforum.net/forums/showthread.php?t=473423)) \\ | ||
| + | |||
| + | {{:techtalk:evo:susp:07_rear_motor_mount_25_by_cosmo_kramer.jpg?direct&300|}} ((photo by Cosmo Kramer of the XLFORUM http://xlforum.net/forums/showthread.php?t=473423)) {{:techtalk:evo:susp:07_rear_motor_mount_24_by_cosmo_kramer.jpg?direct&300|}} ((photo by Cosmo Kramer of the XLFORUM http://xlforum.net/forums/showthread.php?t=473423)) \\ | ||
| + | |||
| + | On the shoulder of the shaft there are two "flat" spots 180° from each other. The retainer plate has two small tabs that fit into the flat spots. \\ | ||
| + | The shaft can still rotate a small amount until the shoulder on the shaft comes into contact with the tab. \\ | ||
| + | The backing plate has two tabs that engage those flat spots on the pivot shaft and that connection locks the shaft from rotating once installed. \\ | ||
| + | |||
| + | {{:techtalk:evo:susp:07_rear_motor_mount_16_by_cosmo_kramer.jpg?direct&300|}} ((photo by Cosmo Kramer of the XLFORUM http://xlforum.net/forums/showthread.php?t=473423)) {{:techtalk:evo:susp:07_rear_motor_mount_17_by_cosmo_kramer.jpg?direct&300|}} ((photo by Cosmo Kramer of the XLFORUM http://xlforum.net/forums/showthread.php?t=473423)) {{:techtalk:evo:susp:07_rear_motor_mount_18_by_cosmo_kramer.jpg?direct&200|}} ((photo by Cosmo Kramer of the XLFORUM http://xlforum.net/forums/showthread.php?t=473423)) \\ | ||
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