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techtalk:ref:engmech01pq [2020/10/27 00:23]
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-====== REF: Engine Mechanicals - Sub-01Q ====== 
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-====== Aftermarket Lifter Issues ====== 
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-====== Roller Pin Manuf. Defect and Repair ====== 
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-It seems aftermarket lifters have a tendency to be wide at the roller end (at the opposite pins holding the roller). \\ 
-Measure them before installing to be sure they won't scratch the lifter bore when turned home. ((Hippysmack of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​p=5283285&​highlight=lifter+pins#​post5283285)) \\ 
-The Fueling lifters below had this problem. \\ 
-The company (when contacted) said they would replace them but with concerns of receiving the same issue with replacements,​ these were resized at the base. \\ 
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-The lifter has to be installed in the top facing the flats toward the engine or it hangs up on the cylinder fins. \\ 
-Once down past the fins, you have to turn them 90 degrees to get the anti-rotation pins in. \\ 
-The lifter was cutting into the bore while installing them and turning them sideways. \\ 
-The extruding sides were cutting on the opposite ends of the roller caps and gathering aluminum shavings in the pin hole recesses. \\ 
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-|{{:​techtalk:​ref:​engmech:​sizing_a_fueling_lifter_base_1_by_hippysmack.jpg?​direct&​300|}}|{{:​techtalk:​ref:​engmech:​sizing_a_fueling_lifter_base_2_by_hippysmack.jpg?​direct&​300|}}|{{:​techtalk:​ref:​engmech:​sizing_a_fueling_lifter_base_3_by_hippysmack.jpg?​direct&​300|}}| 
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-Upon measuring, the main body on this particular set of Fueling lifters were .903" on the main body with the roller end being .9035"​. \\ 
-When the lifter roller pins (or pin caps) were pressed in, this process apparently warped out both opposite sides of the barrel ends. \\ 
-This is similar to squeezing the top of a paper cup. The factory clearance is .0008"​-.0020"​ and out of service limit at .0030" \\ 
-The distance from side to side opposite the roller pin sides had a diameter of .0005" more than the main body. \\ 
-The extruding part of the lifter base acted as a cutter on the lifter bore. \\ 
-They were chucked in a lathe, filed and lightly polished with medium grit sandpaper which brought them down to .903" all around the base. \\ 
-The file was raised up slightly so only the extruding side ends would graze the file. \\ 
-|{{:​techtalk:​ref:​engmech:​sizing_a_fueling_lifter_base_4_by_hippysmack.jpg?​direct&​300|}}|{{:​techtalk:​ref:​engmech:​sizing_a_fueling_lifter_base_5_by_hippysmack.jpg?​direct&​300|}}|{{:​techtalk:​ref:​engmech:​sizing_a_fueling_lifter_base_6_by_hippysmack.jpg?​direct&​300|}}| 
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-91-Up lifters are not in replaceable lifter blocks. So wear in the bore is critical. \\ 
-The FSM says since this model has no tappet bushing, the only way to fix 'out of service bores' are bigger tappets or a new case. \\ 
-So the bore was honed slightly to remove the bulk of the scratches made by the oversized lifter end. \\ 
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-The hone was made from a ball hone with the balls removed and 400 grit sandpaper Gorilla glued to the shaft. \\ 
-To keep center on the hone, a bushing was cut on the lathe with a slip fit hole small enough to accept the wire handle. \\ 
-|The bores are slanted toward the pushrod cup \\ of each rocker arm. ((photo by Hippysmack))| ​ Homemade hone to lightly clean up the lifter bore. ((photos by Hippysmack)) ​ || 
-|{{:​techtalk:​ref:​engmech:​sizing_a_fueling_lifter_base_8_by_hippysmack.jpg?​direct&​300|}}|{{:​techtalk:​ref:​engmech:​sizing_a_fueling_lifter_base_7_by_hippysmack.jpg?​direct&​300|}}|{{:​techtalk:​ref:​engmech:​sizing_a_fueling_lifter_base_11_by_hippysmack.jpg?​direct&​300|}}| 
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-The hone was turned by hand for app. 10 turns (while holding the bushing in place) per lifter bore to clean up the scratches. \\ 
-Due to the slanted bores, the bushing was raised slightly while honing. \\ 
-|Hone held through center of pushrod hole. ((photo by Hippysmack))|This is all that was removed from all 4 bores \\ combined and from the bottom of the bores. ((photo by Hippysmack))|All scratches weren'​t removed but honing too much \\ would open the bore too far. ((photo by Hippysmack))| 
-|{{:​techtalk:​ref:​engmech:​sizing_a_fueling_lifter_base_9_by_hippysmack.jpg?​direct&​300|}}|{{:​techtalk:​ref:​engmech:​sizing_a_fueling_lifter_base_10_by_hippysmack.jpg?​direct&​300|}}|{{:​techtalk:​ref:​engmech:​sizing_a_fueling_lifter_base_12_by_hippysmack.jpg?​direct&​300|}}| 
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