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techtalk:ih:engmech09p [2021/05/30 01:55] hippysmack [1957-1976 Top Center Motor Mount, 1977-1979 Head Strap] |
techtalk:ih:engmech09p [2021/06/28 23:11] hippysmack [Center Mount Straddle Bracket] |
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====== IH: Engine Mechanicals - Sub-09P ====== | ====== IH: Engine Mechanicals - Sub-09P ====== | ||
- | ====== Problems with Illustrations in the HD Manuals for 1957-1978 Head Straddle / Strap Mounts ====== | + | ====== Discrepancies with Motor Mount Illustrations in the HD Manuals (57-76) ====== |
\\ | \\ | ||
- | ====== 1957-1976 Top Center Motor Mount, 1977-1979 Head Strap ====== | + | ====== 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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- | CAN YOU ASSEMBLE THE WASHERS ON TOP OF THE STRADDLE MOUNT INSTEAD? \\ | + | **CAN YOU ASSEMBLE THE WASHERS ON TOP OF THE STRADDLE MOUNT**? \\ |
Of course you can. There are many, many Ironheads running around right now with them on top. \\ | Of course you can. There are many, many Ironheads running around right now with them on top. \\ | ||
- | You may have to fine tune the position of the cylinders or run a rat tail file in the straddle holes to gain some clearance. \\ | + | You may have to run a rat tail file in the straddle holes to gain some clearance or even grind some off the straddle itself. \\ |
- | And repositioning the cylinders may throw out the connection at the intake manifold and create an air leak. \\ | + | 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. \\ |
- | But all in all, it can be done. \\ | + | So you'll need more spacers there to make up that difference. \\ |
- | However, due to the possibility of cracking the head at the tapped holes for the straddle mount if it doesn't line up correctly; \\ | + | 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. \\ |
+ | 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. \\ | ||
+ | |||
+ | **However, due to the possibility of cracking the head at the tapped holes for the straddle mount if it doesn't line up correctly**; \\ | ||
[[techtalk:ih:engmech09#factory_top_mount_installation_per_dr_dick|Click Here]] to reference **Factory Top Mount Installation per Dr Dick** on the main Ironhead motor mount page of the Sportsterpedia. \\ | [[techtalk:ih:engmech09#factory_top_mount_installation_per_dr_dick|Click Here]] to reference **Factory Top Mount Installation per Dr Dick** on the main Ironhead motor mount page of the Sportsterpedia. \\ | ||
+ | Swapping the washers around to the bottom of the straddle is a lot less painful or concerning. \\ | ||
You may find that the holes line up better which puts less stress on the motor. \\ | You may find that the holes line up better which puts less stress on the motor. \\ | ||
And there shouldn't be any added stress to the motor when tightened down to the frame. \\ | And there shouldn't be any added stress to the motor when tightened down to the frame. \\ | ||
Whichever way you choose to assembly the parts, there should be no space to "tighten down" to close up any space remaining after assembling the spacers. \\ | Whichever way you choose to assembly the parts, there should be no space to "tighten down" to close up any space remaining after assembling the spacers. \\ | ||
And there should be no binding between the straddle mount and the heads prior to or after tightening. \\ | And there should be no binding between the straddle mount and the heads prior to or after tightening. \\ | ||
+ | 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 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]] ))| | ||
|{{: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. \\ | ||