Differences
This shows you the differences between two versions of the page.
Both sides previous revision Previous revision Next revision | Previous revision Next revision Both sides next revision | ||
techtalk:evo:engmech01 [2020/08/02 02:00] hippysmack [Flywheels] |
techtalk:evo:engmech01 [2020/08/22 21:13] hippysmack [Pinion Shaft Runout] |
||
---|---|---|---|
Line 99: | Line 99: | ||
**Late 1986 flywheels and crankpin bearing changes**. \\ | **Late 1986 flywheels and crankpin bearing changes**. \\ | ||
Information from Technical Service Bulletin #M-927. [[techtalk:miscres:miscres05#tsb_900-949|Click here to see the actual bulletin from this page in the Sportsterpedia]]. \\ | Information from Technical Service Bulletin #M-927. [[techtalk:miscres:miscres05#tsb_900-949|Click here to see the actual bulletin from this page in the Sportsterpedia]]. \\ | ||
- | Beginning with crankcase numbers 883cc (1786 083 003) and 1100cc (1886 090 012), a new crank pin bearing set and revised flywheels were installed at the factory. \\ | + | Beginning with crankcase numbers 883cc (1786 083 003) and 1100cc (1886 090 012), a new (F.A.G.) crank pin bearing set and revised flywheels were installed at the factory. \\ |
The new crank pin bearing set (using the existing crankpin P/N) consists of three bearings in a package. Early production engines were assembled without thrust washers. \\ | The new crank pin bearing set (using the existing crankpin P/N) consists of three bearings in a package. Early production engines were assembled without thrust washers. \\ | ||
- | L1986-later production flywheels had thrust washers staked into a counter-bore in the flywheels. The L86 crank pin bearing set retrofits earlier 1986 models. \\ | + | L1986-later production flywheels had thrust washers staked into a counter-bore in the flywheels. The L86 crank pin bearing set retrofits earlier models. \\ |
+ | However, the new bearings require a stepped flywheel thrust washer to provide clearance for the wider bearing cages. \\ | ||
+ | You will select the correct thrust washer for your particular assembly and machine off the raised lip in the area of the flywheel thrust washers' I.D. \\ | ||
+ | This lip must be machined off or you will crush the bearing cage as you assemble and torque the crankpin nuts. \\ | ||
+ | [[techtalk:miscres:miscres04#tech_tips_0-199|See Tech Tip #14]], [[techtalk:miscres:miscres08#bottom_end|Instruction Sheet #J00022]] and [[techtalk:miscres:miscres08#bottom_end|Instruction Sheet #J00025]] in the Sportsterpedia for more information. \\ | ||
The L86 XLH883 flywheel assembly is (23905-86A) and the L86 XLH1100 flywheel assembly is (23900-86A). \\ | The L86 XLH883 flywheel assembly is (23905-86A) and the L86 XLH1100 flywheel assembly is (23900-86A). \\ | ||
There were new crank pin bearing clearances also. \\ | There were new crank pin bearing clearances also. \\ | ||
Line 129: | Line 134: | ||
====== Crank Pin ====== | ====== Crank Pin ====== | ||
- | Crank pin (23960-80A) used from L81-03. \\ | + | Crank pin (23960-80A) used from L1981-2003. \\ |
| L87-03 crank pin ((photos by Hippysmack)) ||| | | L87-03 crank pin ((photos by Hippysmack)) ||| | ||
Line 194: | Line 199: | ||
===== Pinion Shaft Runout ===== | ===== Pinion Shaft Runout ===== | ||
+ | Check to see if your crank is out of true. The idea is to measure how much the end of the pinion shaft wobbles. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=1578649)) \\ | ||
+ | Up to .005"-.006" out there at the end of the shaft doesn't propose a huge problem. Most motors you measure will show this much. \\ | ||
+ | But above that is not good. Crank spread is a reality of racing these bikes. The flywheels want to spread apart on the side opposite the crankpin. \\ | ||
+ | When they do, the pinion shaft wobbles. You get real bad wear on the oil pump drive gear (this is why Buell went to a bronze drive gear). \\ | ||
+ | Harley never put it in the XL's because they're lower powered and it's less of an issue. But still sometimes they grenade and make a mess. \\ | ||
+ | Pinion shaft wobble also causes teeth to break off the pinion gear, and the pinion bushing to wear, and cam bushings to wear. \\ | ||
+ | To confirm pinion shaft runout dims, make the measurement as in below. \\ | ||
+ | |||
|Attach a scrap piece of metal to the outside of the gearcase and position a gauge holder on it so it won't move while turning over the engine. ((photos by anachris of the XLFORUM ))||| | |Attach a scrap piece of metal to the outside of the gearcase and position a gauge holder on it so it won't move while turning over the engine. ((photos by anachris of the XLFORUM ))||| | ||
|{{:techtalk:ref:tools:checking_pinion_shaft_runout_1_by_anachris.jpg?direct&300|}}|{{:techtalk:ref:tools:checking_pinion_shaft_runout_2_by_anachris.jpg?direct&300|}}|{{:techtalk:ref:tools:checking_pinion_shaft_runout_3_by_anachris.jpg?direct&300|}}| | |{{:techtalk:ref:tools:checking_pinion_shaft_runout_1_by_anachris.jpg?direct&300|}}|{{:techtalk:ref:tools:checking_pinion_shaft_runout_2_by_anachris.jpg?direct&300|}}|{{:techtalk:ref:tools:checking_pinion_shaft_runout_3_by_anachris.jpg?direct&300|}}| |