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techtalk:evo:engmech01 [2020/08/02 01:49] hippysmack [Flywheels] |
techtalk:evo:engmech01 [2020/08/02 02:54] hippysmack [Crank Pin] |
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|{{:techtalk:evo:engmech:flywheel_assembly_23905-00_by_aussiegazza.jpg?direct&300|}}|{{:techtalk:evo:engmech:flywheel_assembly_23905-00a_by_wilbur.jpg?direct&300|}}| | |{{:techtalk:evo:engmech:flywheel_assembly_23905-00_by_aussiegazza.jpg?direct&300|}}|{{:techtalk:evo:engmech:flywheel_assembly_23905-00a_by_wilbur.jpg?direct&300|}}| | ||
====== Flywheels ====== | ====== Flywheels ====== | ||
- | **Late 1986 FLYWHEELS AND CRANK PIN BEARINGS 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 on 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. \\ | ||
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The color coding DOES NOT indicate size selection for crank pin bearing replacement. \\ | The color coding DOES NOT indicate size selection for crank pin bearing replacement. \\ | ||
+ | **1989 flywheel changes**. \\ | ||
+ | Information from Technical Service Bulletin #M-971. [[techtalk:miscres:miscres05#tsb_950-999|Click here to see the actual bulletin from this page in the Sportsterpedia]]. \\ | ||
+ | Beginning June 1, 1988, flywheels forged from a micro-alloyed steel went into production. Part numbers and color codes of assemblies with the new material were changed. \\ | ||
**1991-1994 Flywheels**. \\ | **1991-1994 Flywheels**. \\ | ||
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====== 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)) ||| |