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techtalk:ih:engmech09p [2021/06/28 23:00] hippysmack [1957-1976 Top Center Motor Mount, 1977-1979 Head Strap] |
techtalk:ih:engmech09p [2023/12/27 21:18] (current) hippysmack |
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| ====== Discrepancies with Motor Mount Illustrations in the HD Manuals (57-76) ====== | ====== Discrepancies with Motor Mount Illustrations in the HD Manuals (57-76) ====== | ||
| \\ | \\ | ||
| - | ====== 1957-1976 Top Center Motor Mount ====== | + | ====== Center Mount Straddle Bracket ====== |
| This section is dedicated to the assembly positioning of the 1/8" washers during assembly for the top motor mount straddle on 1957-1976 models. \\ | This section is dedicated to the assembly positioning of the 1/8" washers during assembly for the top motor mount straddle on 1957-1976 models. \\ | ||
| This also includes the 77-78 "head strap" between the heads (but does not tie back to the frame). \\ | This also includes the 77-78 "head strap" between the heads (but does not tie back to the frame). \\ | ||
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| Placing the washer on top of the mount also decreases the height of the straddle which adds more space between the cross brace and frame mount. \\ | Placing the washer on top of the mount also decreases the height of the straddle which adds more space between the cross brace and frame mount. \\ | ||
| So you'll need more spacers there to make up that difference. \\ | So you'll need more spacers there to make up that difference. \\ | ||
| - | The intake manifold fit determines head and cylinder position. ((ryder rick of the XLFORUM http://xlforum.net/forums/showthread.php?threadid=2023240)) It's a bad idea to turn the cylinders just to make the mount work. \\ | + | The intake manifold fit determines head and cylinder position. ((ryder rick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/189737-top-motor-mount-bracket-hole-mis-alignment?threadid=2023240)) It's a bad idea to turn the cylinders just to make the mount work. \\ |
| This is critical on an O-ring style joints. Too big of a gap and the O-rings may not seal correctly and create an air leak. \\ | This is critical on an O-ring style joints. Too big of a gap and the O-rings may not seal correctly and create an air leak. \\ | ||
| But all in all, it can be done while paying close attention to the assembly process. \\ | But all in all, it can be done while paying close attention to the assembly process. \\ | ||
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| In fact, you can induce added vibration and potential for cracks in the mounts or cases if the mounts aren't installed properly. \\ | In fact, you can induce added vibration and potential for cracks in the mounts or cases if the mounts aren't installed properly. \\ | ||
| - | |Washers on top of the straddle mount (71 XLCH). \\ (as shown in the parts books and most FSMs) ((photo by piniongear of the XLFORUM http://xlforum.net/forums/showthread.php?t=1139862&page=3))| Machined area on head for the straddle mount. \\ (notice the binding that occurred in the left pic) ((combined pics from Ebay sellers, Vintage Parts Suppliers, [[https://www.ebay.com/str/vintagepartssuppliers?_trksid=p2047675.l2563|Link to Ebay Store]] and Rusty Dusty Motorcycle Parts [[https://www.ebay.com/str/bialystreasures?_trksid=p2047675.l2563|Link to Ebay Store]] ))| | + | |Washers on top of the straddle mount (71 XLCH). \\ (as shown in the parts books and most FSMs) ((photo by piniongear of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/117858-wiring-placement-pictures-or-diagrams/page3?t=1139862&page=3))| Machined area on head for the straddle mount. \\ (notice the binding that occurred in the left pic) ((combined pics from Ebay sellers, Vintage Parts Suppliers, [[https://www.ebay.com/str/vintagepartssuppliers?_trksid=p2047675.l2563|Link to Ebay Store]] and Rusty Dusty Motorcycle Parts [[https://www.ebay.com/str/bialystreasures?_trksid=p2047675.l2563|Link to Ebay Store]] ))| |
| |{{:techtalk:ih:engmech:topmount_1_on_71_xlch_by_piniongear.jpg?direct&300|}}|{{:techtalk:ih:engmech:top_mount_hole_compilation_from_vintage_parts_suppliers_and_rusty_dust_motorcycle_parts.jpg?direct&300|}}| | |{{:techtalk:ih:engmech:topmount_1_on_71_xlch_by_piniongear.jpg?direct&300|}}|{{:techtalk:ih:engmech:top_mount_hole_compilation_from_vintage_parts_suppliers_and_rusty_dust_motorcycle_parts.jpg?direct&300|}}| | ||
| + | |||
| + | ====== Center Mount Cross Brace ====== | ||
| + | |||
| + | * The -57 parts catalog doesn't show or list the cross brace or the bolt to the frame. \\ However, it does show all three (frame bolt) cross brace washers to be under the straddle mount which is wrong of course. \\ | ||
