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--- techtalk:ih:engmech01 [2019/06/17 03:23]
hippysmack [Sub-Documents]
+++ techtalk:ih:engmech01 [2020/09/17 03:33]
hippysmack [Gearcase / Cam Cover]
@@ Line 12: / Line 12: @@
 |  Cam Cover (casting 25202-52A) ((photo by ironheadjunkie of the XLFORUM http://xlforum.net/forums/showthread.php?t=1421916&page=2))  |
 |{{:techtalk:ih:engmech:cam_cover_1_25202-52a_by_ironheadjunkie.jpg?direct&300|}}|
+===== Cam Cover Bushings =====
+**Breather bushing**: \\
+Looking at the brass part, you can see how the spring catches on the inward bent tabs.  There are also unbent tabs on the brass. ((Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1861965)) \\
+These, when bent outward just a little, fit into slots on the far side of the steel bushing pressed into cam cover. \\
+Here's how the factory assembled this thing. \\
+They had pre-assembled the brass to the steel before the steel was pressed into the cover. \\
+Then dropped the spring into the cover and pressed the brass/steel assembly into the cover as a unit (and manipulated the spring to sit correctly if needed). \\
+However, it is possible to assemble the unit without removing the steel from the cover.
+Notes: \\
+The tabs must be bent outward enough that the brass stays keyed to the steel at full spring compression. \\
+You don't want the brass hat to 'unkey' when the generator compresses spring.
+The brass needs to be able to 'plunge' in and out under the spring pressure once the tags are bent. \\
+If you get too aggressive, you can cause deformations in the brass that allow it to hang up in it's sliding fit to the steel. \\
+These outward bent tangs do 2 things. \\
+  * They keep the brass hat and spring captive in the cover upon generator removal.
+  * More importantly, they key the brass to the steel to prevent the brass from rotating with the generator gear. \\ The brass is unable to rotate by the tangs keying into the slots.
+{{:techtalk:ih:engmech:breather_bushing_pic1_by_62_ironhead.jpg?direct&300|}} ((photo by 62 Ironhead of the XLFORUM http://xlforum.net/forums/showthread.php?t=1861965)) {{:techtalk:ih:engmech:breather_bushing_pic2_by_62_ironhead.jpg?direct&300|}} ((photo by 62 Ironhead of the XLFORUM http://xlforum.net/forums/showthread.php?t=1861965)) \\
+{{:techtalk:ih:engmech:breather_bushing_pic3_by_62_ironhead.jpg?direct&300|}} ((photo by 62 Ironhead of the XLFORUM http://xlforum.net/forums/showthread.php?t=1861965)) {{:techtalk:ih:engmech:breather_bushing_pic4_by_62_ironhead.jpg?direct&300|}} ((photo by 62 Ironhead of the XLFORUM http://xlforum.net/forums/showthread.php?t=1861965)) {{:techtalk:ih:engmech:breather_bushing_pic5_by_62_ironhead.jpg?direct&300|}} ((photo by 62 Ironhead of the XLFORUM http://xlforum.net/forums/showthread.php?t=1861965)) \\
 ====== Flywheel ======
 ===== Sub-Documents =====

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