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techtalk:evo:engmech01 [2020/08/02 02:00] hippysmack [Flywheels] |
techtalk:evo:engmech01 [2020/08/02 02:22] hippysmack [Flywheels] |
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| **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 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. \\ | ||
