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techtalk:ih:susp03d [2022/02/19 05:23] hippysmack [Swingarm Installation] |
techtalk:ih:susp03d [2022/02/19 18:50] hippysmack [Bearings] |
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| ====== Swingarm Assembly ====== | ====== Swingarm Assembly ====== | ||
| - | ===== Orientation of Parts ===== | + | ===== Parts Orientation and Installation ===== |
| + | ==== Bearings ==== | ||
| + | 1957-E1974 bearing part# is (47521-52), 2 required. It's a Timken tapered bearing, now obsoleted by HD. \\ | ||
| + | The bearing can still be bought under the manufacturer numbers: Outer race: (17520), Inner race/bearing (17580). \\ | ||
| + | In February of 1974, the MoCo changed to bearing kit (47550-74) and it was supplied through parts order in place of individual bearing (47521-52). \\ | ||
| + | The kit has 2 Timken tapered bearings (47521-74) which are .100" narrower than the original production bearings: Outer Race (11520), Bearing (11590). \\ | ||
| + | See also Service Bulletin No. 688 dated May 12, 1975. \\ | ||
| + | Either bearings can be used but All the parts required for each must be used together to obtain the correct rear fork bearing fit. \\ | ||
| + | The small end of the bearing cone is installed from the inner side of each pivot. \\ | ||
| + | |||
| + | | Parts for Either Bearing Setup (don't mix them up) ||| | ||
| + | | |1957-E1974 Bearing 47521-52|L1974-up Rear Fork Bearing Kit| | ||
| + | |Pivot Bolt Nut|47512-52|47512-74| | ||
| + | |Left Bearing Locknut|47514-52|47514-74| | ||
| + | |Right Bearing Locknut|47515-52|47515-74| | ||
| + | |Outer Spacer|47517-52|47517-74| | ||
| + | |Bearing ( 2 used)|47521-52|47521-74| | ||
| + | |||
| + | ==== Outer Bearing Races ==== | ||
| + | **Orientation**: \\ | ||
| + | There's been a lot of debate on orientation of the bearing races (wide side facing in or out). ((Moon Wolf of the XLFORUM http://xlforum.net/forums/showthread.php?t=563958)) \\ | ||
| + | Those in the know have agreed the proper way to assemble the bearings is (wide side in as in the pic below). \\ | ||
| + | That puts you installing the bearing cone/inner race from the inner side of each pivot. \\ | ||
| + | |||
| + | The FSMs do not make this clear and cause confusion. The bearings insert into the inner side pivot bore. \\ | ||
| + | \\ | ||
| + | |||
| + | **Installation**: \\ | ||
| + | The bearing races are not a tight fit in the swing arm when installing them (more of a light interference fit). ((Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=563958)) \\ | ||
| + | It's all about assembly and loading the bearings. \\ | ||
| + | They need to be able to move when you tighten up the nut on the swing arm pivot to set the preload. \\ | ||
| + | The best way to get the bearing races in and out is with a large nut and bolt, like 1/2" UNF, and some large flat washers. \\ You can use socket wrenches as spacers too. \\ | ||
| + | Put a socket on the bearing race that is just smaller than the outside diameter of the bearing race. \\ | ||
| + | Then put a socket over the hole in the swingarm, where the socket is large enough to allow the bearing race to clear the inside of it. \\ | ||
| + | Run your bolt, or a length of all thread rod through the holes in the middles of the sockets and tighten the nut(s). \\ | ||
| + | The race should slide right in or out. \\ | ||
| |Each bearing shield is pressed or driven in from the outside of the fork. The bearing spacer is inserted from outside of fork (with the shoulder facing in). Heavily grease each bearing | |Each bearing shield is pressed or driven in from the outside of the fork. The bearing spacer is inserted from outside of fork (with the shoulder facing in). Heavily grease each bearing | ||
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| |{{:techtalk:ih:susp:1980_swingarm_assy_by_outlawtexan67.jpg?direct&300|}}| | |{{:techtalk:ih:susp:1980_swingarm_assy_by_outlawtexan67.jpg?direct&300|}}| | ||
| | 1980 Swingarm bolt assembly ((photo by OutlawTexan67 http://xlforum.net/forums/showthread.php?t=185355)) | | | 1980 Swingarm bolt assembly ((photo by OutlawTexan67 http://xlforum.net/forums/showthread.php?t=185355)) | | ||
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| Comments from Dr Dick ((http://xlforum.net/forums/showthread.php?t=1725013)) \\ | Comments from Dr Dick ((http://xlforum.net/forums/showthread.php?t=1725013)) \\ | ||
| - | Why preload? It makes sure the bearings aren't loose. How much preload? Too little makes your bike 'flighty'. It wont 'suretrack'. I call it 'marshmellow-ish'. Too much and you will burn thru bearings at an alarming rate. Where does the preload come from? Swingarm front casting flex. \\ | + | Why preload? It makes sure the bearings aren't loose. How much preload? Too little makes your bike "flighty". It wont "suretrack". I call it "marshmellow-ish". Too much and you will burn thru bearings at an alarming rate. Where does the preload come from? Swingarm front casting flex. \\ |
| Frame: A close look will show that both bearing inners and everything that slides over or attaches to the pivot bolt becomes solidified as one with the frame when the pivot bolt is tightened. They are immobile. | Frame: A close look will show that both bearing inners and everything that slides over or attaches to the pivot bolt becomes solidified as one with the frame when the pivot bolt is tightened. They are immobile. | ||
