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techtalk:evo:engmech04j [2021/07/09 05:03] hippysmack |
techtalk:evo:engmech04j [2024/01/04 01:29] (current) hippysmack |
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| The rocker arm shaft is not supposed to rotate from it's installed position. \\ | The rocker arm shaft is not supposed to rotate from it's installed position. \\ | ||
| - | The shafts have a notch in them that the bolt is supposed to butt up against which locks the rocker arm shafts in place. ((DK Custom of the XLFORUM )) \\ | + | The shafts have a notch in them that the bolt is supposed to butt up against which locks the rocker arm shafts in place. ((DK Custom of the XLFORUM)) \\ |
| However, the bolt hole is too large which leaves a gap there. \\ | However, the bolt hole is too large which leaves a gap there. \\ | ||
| This gap allows the shaft to slightly rotate and hit the bolt which causes an annoying ticking/tapping noise. \\ | This gap allows the shaft to slightly rotate and hit the bolt which causes an annoying ticking/tapping noise. \\ | ||
| Line 24: | Line 24: | ||
| The FSM suggests visual inspection and measuring of specific clearances as outlined below as a guide to when to replace parts. \\ | The FSM suggests visual inspection and measuring of specific clearances as outlined below as a guide to when to replace parts. \\ | ||
| Ultimately, it's an individual judgment call as to replacing parts that are within measured specs. \\ | Ultimately, it's an individual judgment call as to replacing parts that are within measured specs. \\ | ||
| - | |||
| ===== Rocker Arm Specs ===== | ===== Rocker Arm Specs ===== | ||
| Line 52: | Line 51: | ||
| ==== Check Arm Contact at Valve Spring ==== | ==== Check Arm Contact at Valve Spring ==== | ||
| - | |Check to make sure the rocker arm isn't hitting the \\ spring collar. ((photo by biknut of the XLFORUM http://xlforum.net/forums/showthread.php?t=810341&page=2))| If so, you can clearance the underside of the arm.((photos by Al Bundy of the XLFORUM http://xlforum.net/forums/showthread.php?t=1671891&page=11))|| | + | |Check to make sure the rocker arm isn't hitting the \\ spring collar. ((photo by biknut of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-motor-top-end/96437-roller-rockers-whos-got-em/page2?t=810341&page=2))| If so, you can clearance the underside of the arm.((photos by Al Bundy of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/156105-small-1985-project/page11?t=1671891&page=11))|| |
| |{{:techtalk:evo:engmech:rocker_box_clearance_1_by_biknut.jpg?direct&300|}}|{{:techtalk:evo:engmech:rocker_box_clearance_1_by_al_bundy.jpg?direct&300|}}|{{:techtalk:evo:engmech:rocker_box_clearance_2_by_al_bundy.jpg?direct&300|}}| | |{{:techtalk:evo:engmech:rocker_box_clearance_1_by_biknut.jpg?direct&300|}}|{{:techtalk:evo:engmech:rocker_box_clearance_1_by_al_bundy.jpg?direct&300|}}|{{:techtalk:evo:engmech:rocker_box_clearance_2_by_al_bundy.jpg?direct&300|}}| | ||
| + | |||
| ===== Inspection after removal ===== | ===== Inspection after removal ===== | ||
| If the rocker arm shafts will not slide out on their own; \\ | If the rocker arm shafts will not slide out on their own; \\ | ||
| Line 59: | Line 59: | ||
| |{{:techtalk:evo:engmech:removing_rocker_arm_shaft_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:engmech:removing_rocker_arm_shaft_2_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:engmech:removing_rocker_arm_shaft_3_by_hippysmack.jpg?direct&300|}}| | |{{:techtalk:evo:engmech:removing_rocker_arm_shaft_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:engmech:removing_rocker_arm_shaft_2_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:engmech:removing_rocker_arm_shaft_3_by_hippysmack.jpg?direct&300|}}| | ||
| + | |||
| **You'll be measuring for an 'out of round' condition of the rocker arm and associated parts**. \\ | **You'll be measuring for an 'out of round' condition of the rocker arm and associated parts**. \\ | ||
| Most of the wear in the rocker arm shafts and bores results from up and down movement of the pushrods and valves. ((2004 HD Sportster FSM pg 3-36)) \\ | Most of the wear in the rocker arm shafts and bores results from up and down movement of the pushrods and valves. ((2004 HD Sportster FSM pg 3-36)) \\ | ||
| Line 71: | Line 72: | ||
| ==== Check the shaft in bushing clearance ==== | ==== Check the shaft in bushing clearance ==== | ||
| - | [[techtalk:ref:svcproc17#replacing_rocker_arm_bushings|Click Here]] to reference the bushing replacement page in the REF section of the Sportsterpedia. \\ | + | [[techtalk:ref:svcproc17#replacing_rocker_arm_bushings|Click Here]] to reference the Rocker Arm Bushing Replacement page in the REF section of the Sportsterpedia. \\ |
| All measurements should be taken from the top to bottom position as each part sits while installed as per the FSM. \\ | All measurements should be taken from the top to bottom position as each part sits while installed as per the FSM. \\ | ||
| Both arms on each rocker are being pushed upward during operation. \\ | Both arms on each rocker are being pushed upward during operation. \\ | ||
| The load side is on the bottom. That is where most of the wear will be as in the pic below. \\ | The load side is on the bottom. That is where most of the wear will be as in the pic below. \\ | ||
| - | {{:techtalk:evo:engmech:rocker_arm_bushing_wear_by_madnss.jpg?direct&200|}} ((photo by madnss of the XLFORUM http://xlforum.net/forums/showthread.php?t=1776474&highlight=rocker+arm+bushings&page=7)) | + | {{:techtalk:evo:engmech:rocker_arm_bushing_wear_by_madnss.jpg?direct&200|}} ((photo by madnss of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-motor-top-end/165126-big-cams-s-s-roller-rockers/page7?t=1776474&highlight=rocker+arm+bushings&page=7)) |
| - Measure and record the rocker arm shaft dia. at each bushing area with a caliper. | - Measure and record the rocker arm shaft dia. at each bushing area with a caliper. | ||
| Line 94: | Line 94: | ||
| This allows a slight movement of the shaft in it's rocker cover bore. \\ | This allows a slight movement of the shaft in it's rocker cover bore. \\ | ||
| - | You can check for slight movement there on a running engine: ((rejeanprimeau of the XLFORUM http://xlforum.net/forums/showthread.php?p=5378069&highlight=rocker+lockers#post5378069)) \\ | + | You can check for slight movement there on a running engine: ((rejeanprimeau of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-general-discussion-and-problems/183205-rocker-box-knocking-and-its-driving-me-nuts/page2?highlight=rocker+lockers#post3911948)) \\ |
| With the covers off, draw a straight line with a felt marker on the end of the shaft from the cover bore and down the shaft. \\ | With the covers off, draw a straight line with a felt marker on the end of the shaft from the cover bore and down the shaft. \\ | ||
| Then fire up the engine. At idle, if you see any back and forth movement of that line, you have movement of the shaft. \\ | Then fire up the engine. At idle, if you see any back and forth movement of that line, you have movement of the shaft. \\ | ||
| Line 134: | Line 134: | ||
| You can use a welding tip cleaner or other small wire to poke down this hole to clean or verify the hole is clear. \\ | You can use a welding tip cleaner or other small wire to poke down this hole to clean or verify the hole is clear. \\ | ||
| - | {{:techtalk:evo:engmech:exhaust_rocker_arm_by_dirtycory.jpg?direct&300|}} ((photo by DirtyCory of the XLFORUM http://xlforum.net/forums/showpost.php?p=3945019&postcount=317)) {{:techtalk:evo:engmech:cleaning_oiler_hole_in_rocker_arm_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) \\ | + | {{:techtalk:evo:engmech:exhaust_rocker_arm_by_dirtycory.jpg?direct&300|}} ((photo by DirtyCory of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/127032-getting-this-78-back-to-the-way-it-should-be/page22?postcount=317#post2887827)) {{:techtalk:evo:engmech:cleaning_oiler_hole_in_rocker_arm_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) \\ |
| ===== Visual Inpections ===== | ===== Visual Inpections ===== | ||
| ==== Inspect the valve stems ==== | ==== Inspect the valve stems ==== | ||
| - | |||
| * Look at the condition of the valve stems in the heads. \\ This will give you an indication of how the rocker pad is wearing against the valves. \\ Check for pitting or uneven wear. | * Look at the condition of the valve stems in the heads. \\ This will give you an indication of how the rocker pad is wearing against the valves. \\ Check for pitting or uneven wear. | ||
| |{{:techtalk:evo:engmech:inspecting_valve_stem_by_hippysmack.jpg?direct&300|}}| | |{{:techtalk:evo:engmech:inspecting_valve_stem_by_hippysmack.jpg?direct&300|}}| | ||
| + | |||
| ==== Inspect the rocker arm ends ==== | ==== Inspect the rocker arm ends ==== | ||
| - | |||
| * Inspect both the rocker arm pad and pushrod end for uneven wear or pitting. \\ Replace the rocker arm if either exist. | * Inspect both the rocker arm pad and pushrod end for uneven wear or pitting. \\ Replace the rocker arm if either exist. | ||
| |{{:techtalk:evo:engmech:rocker_arm_inspection_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:engmech:rocker_arm_inspection_2_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:engmech:rocker_arm_inspection_3_by_hippysmack.jpg?direct&300|}}| | |{{:techtalk:evo:engmech:rocker_arm_inspection_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:engmech:rocker_arm_inspection_2_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:engmech:rocker_arm_inspection_3_by_hippysmack.jpg?direct&300|}}| | ||
| - | |||
| \\ | \\ | ||
