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techtalk:ref:engmech01q [2019/02/18 16:52] 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)) \\ | ||
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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.| Homemade hone to lightly clean up the lifter bore. || | ||
- | |{{: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 per lifter bore to clean up the scratches. | ||
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- | |{{: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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===== Other Useful Links ===== | ===== Other Useful Links ===== |