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techtalk:evo:engmech04j [2021/07/07 20:14] hippysmack [Check the valve oiler hole in the rocker arm] |
techtalk:evo:engmech04j [2021/07/08 00:15] hippysmack [Check the shaft in bushing clearance] |
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- Measure and record the I.D of the rocker arm bushing with a telescoping bore gauge and caliper. | - Measure and record the I.D of the rocker arm bushing with a telescoping bore gauge and caliper. | ||
- Subtract the shaft dia. from the bushing I.D. and match that number against the wear limit specs. | - Subtract the shaft dia. from the bushing I.D. and match that number against the wear limit specs. | ||
- | * If the bushing is at or past the service wear limit, proceed to "replacing the bushings" as in below. | + | * If the bushing is within service limit, install the rocker arm as is. |
+ | * If the bushing is at or past the service wear limit: | ||
+ | * Proceed to [[techtalk:evo:engmech04j#rocker_arm_bushing_replacement|Replacing the Rocker Arm Bushings]] below. | ||
+ | * If you choose not to replace the bushing, it is advised to replace the entire rocker arm. \\ New rocker arms come with new pre-sized bushings. | ||
|{{:techtalk:evo:engmech:mic_the_rocker_arm_shaft_2_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:engmech:mic_the_rocker_arm_bushing_bore_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:engmech:mic_the_rocker_arm_bushing_bore_2_by_hippysmack.jpg?direct&300|}}| | |{{:techtalk:evo:engmech:mic_the_rocker_arm_shaft_2_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:engmech:mic_the_rocker_arm_bushing_bore_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:engmech:mic_the_rocker_arm_bushing_bore_2_by_hippysmack.jpg?direct&300|}}| | ||
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|{{: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|}}| | ||
====== Rocker Arm Bushing Replacement ====== | ====== Rocker Arm Bushing Replacement ====== | ||
+ | This procedure is ONLY needed IF you want to replace the bushings but not the rocker arms. \\ | ||
+ | New rocker arms come with new bushings that have already been properly sized for the rocker arm shafts. \\ | ||
+ | |||
A helpful suggestion is to mic the bushings closely and several times to be sure you need to before replacing them. ((Hippysmack of the XLFORUM http://xlforum.net/forums/showthread.php?t=2072192)) \\ | A helpful suggestion is to mic the bushings closely and several times to be sure you need to before replacing them. ((Hippysmack of the XLFORUM http://xlforum.net/forums/showthread.php?t=2072192)) \\ | ||
If the rocker arm pads or the pushrod cups are worn badly, it'd probably be best to just replace the arms instead. \\ | If the rocker arm pads or the pushrod cups are worn badly, it'd probably be best to just replace the arms instead. \\ | ||
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|If needed, the end of the bushing can be filed down flush to the rocker arm. Place a straightedge across the assembly to ensure it's flat end to end. \\ The file will cut down the bushing before harming the hardened rocker arm. ((photos by Hippysmack))||| | |If needed, the end of the bushing can be filed down flush to the rocker arm. Place a straightedge across the assembly to ensure it's flat end to end. \\ The file will cut down the bushing before harming the hardened rocker arm. ((photos by Hippysmack))||| | ||
|{{:techtalk:evo:engmech:replacing_rocker_arm_bushings_44_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:engmech:replacing_rocker_arm_bushings_45_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:engmech:replacing_rocker_arm_bushings_46_by_hippysmack.jpg?direct&300|}}| | |{{:techtalk:evo:engmech:replacing_rocker_arm_bushings_44_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:engmech:replacing_rocker_arm_bushings_45_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:engmech:replacing_rocker_arm_bushings_46_by_hippysmack.jpg?direct&300|}}| | ||
- | ==== Ream and Lap the New Bushing ==== | + | ==== Ream the New Bushing to Size ==== |
The proper way to ream rocker shaft bushing's is to come in from the opposite bushing with the reamer. ((brucstoudt of the XLFORUM http://xlforum.net/forums/showthread.php?p=5189428&highlight=rocker+arm+bushings#post5189428)) \\ | The proper way to ream rocker shaft bushing's is to come in from the opposite bushing with the reamer. ((brucstoudt of the XLFORUM http://xlforum.net/forums/showthread.php?p=5189428&highlight=rocker+arm+bushings#post5189428)) \\ | ||
That way the existing bushing acts as a guide for the bushing being reamed. \\ | That way the existing bushing acts as a guide for the bushing being reamed. \\ | ||
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**The process**; \\ | **The process**; \\ | ||
- | |||
- Line ream the bushing using rocker arm bushing reamer (94804-57). | - Line ream the bushing using rocker arm bushing reamer (94804-57). | ||
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|{{:techtalk:evo:engmech:replacing_rocker_arm_bushings_56_by_hippysmack.jpg?direct&300|}}| | |{{:techtalk:evo:engmech:replacing_rocker_arm_bushings_56_by_hippysmack.jpg?direct&300|}}| | ||
- | === Line Lapping === | + | ==== Lap New Bushing If Needed ==== |
+ | Sometimes a reaming job just doesn't quite go as expected or doesn't quite give the clearance needed. \\ | ||
+ | If using a same size reamer as the shaft, you can ream the bushing and then lap it to get the desired clearance. \\ | ||
+ | This will yield a tighter clearance than using the next up size reamer. \\ | ||
+ | Lapping is a common practice after reaming. \\ | ||
A lapping tool can be made from a 1/2" wooden dowel and a small piece of sandpaper. ((photos by Hippysmack)) \\ | A lapping tool can be made from a 1/2" wooden dowel and a small piece of sandpaper. ((photos by Hippysmack)) \\ |