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techtalk:ref:engmech01q [2019/02/18 06:10] hippysmack [Roller end manuf. defect repair] |
techtalk:ref:engmech01q [2024/01/14 18:24] hippysmack |
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| ====== Tappet Flats ====== | ====== Tappet Flats ====== | ||
| **This is in consideration of induced noise from the use of high lift cams**. \\ | **This is in consideration of induced noise from the use of high lift cams**. \\ | ||
| - | The factory lifter is up to the job from the point of view of the hydraulics. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=1510606&page=2)) \\ | + | The factory lifter is up to the job from the point of view of the hydraulics. ((aswracing of the XLFORUM https://www.xlforum.net/forum/vendors/hammer-performance/139198-well-been-doing-some-thinking-excess-valvetrain-noise/page2?t=1510606&page=2)) \\ |
| However, the factory lifter's weaknesses are lack of available travel and less durable axle bearings. \\ | However, the factory lifter's weaknesses are lack of available travel and less durable axle bearings. \\ | ||
| It's possible to machine the flat longer on a stock lifter. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=341901)) \\ | It's possible to machine the flat longer on a stock lifter. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=341901)) \\ | ||
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| The longer flats also allow higher lifts. | The longer flats also allow higher lifts. | ||
| - | ===== Roller end manuf. defect repair ===== | ||
| - | 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)) \\ | ||
| - | |{{: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 only .0008". \\ | ||
| - | The distance from cap to cap across the roller pin sides had a diameter of .0005" more than the main body. \\ | ||
| - | 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 cap 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. \\ | ||
| - | A hone for the bore was made with the balls removed from a ball hone and 400 grit sandpaper attached to the shaft end with Gorilla glue. \\ | ||
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| - | |{{:techtalk:ref:engmech:sizing_a_fueling_lifter_base_7_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ref:engmech:sizing_a_fueling_lifter_base_8_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ref:engmech:sizing_a_fueling_lifter_base_9_by_hippysmack.jpg?direct&300|}}| | ||
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| - | |{{:techtalk:ref:engmech:sizing_a_fueling_lifter_base_10_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ref:engmech:sizing_a_fueling_lifter_base_11_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ref:engmech:sizing_a_fueling_lifter_base_12_by_hippysmack.jpg?direct&300|}}| | ||
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| - | \\ | ||
| - | |I have my prototype hone drying....400 grit Gorilla glued to the ball hone shaft. | ||
| ===== Other Useful Links ===== | ===== Other Useful Links ===== | ||
| This is a very good XLFORUM discussion thread on [[http://xlforum.net/forums/showthread.php?t=1933342&highlight=disassembling+lifters|lifters and high lift cams]]. \\ | This is a very good XLFORUM discussion thread on [[http://xlforum.net/forums/showthread.php?t=1933342&highlight=disassembling+lifters|lifters and high lift cams]]. \\ | ||
