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techtalk:ref:tools147 [2019/05/09 22:00] hippysmack [Calculating Pre-Ream Drill Hole Sizes] |
techtalk:ref:tools147 [2020/08/24 23:19] hippysmack [Rocker Arm Bushing Reamer (94804-57)] |
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| * [[techtalk:ref:genmsr11|Cutting Oils, Soaking Oils and Lubes]] | * [[techtalk:ref:genmsr11|Cutting Oils, Soaking Oils and Lubes]] | ||
| - | * [[techtalk:ref:svcproc40#general_drilling_and_tapping|General Drilling and Tapping]] | + | * [[techtalk:ref:tools030#general_drilling_and_tapping|General Drilling and Tapping]] |
| ====== Types of Reamers ====== | ====== Types of Reamers ====== | ||
| Line 41: | Line 41: | ||
| | "Jims" makes this reamer referenced to HD part number (94804-57) ((photos by Hippysmack)) || | | "Jims" makes this reamer referenced to HD part number (94804-57) ((photos by Hippysmack)) || | ||
| |{{:techtalk:ref:tools:jims_94804-57_rocker_bushing_reamer_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ref:tools:jims_94804-57_rocker_bushing_reamer_2_by_hippysmack.jpg?direct&300|}}| | |{{:techtalk:ref:tools:jims_94804-57_rocker_bushing_reamer_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ref:tools:jims_94804-57_rocker_bushing_reamer_2_by_hippysmack.jpg?direct&300|}}| | ||
| + | |||
| + | ===== Cam Bushing Reamers ===== | ||
| + | \\ | ||
| + | ==== Outer Cam Bushings ==== | ||
| + | (AKA Cam Cover Bushings): \\ | ||
| + | The reamers for the cam cover bushings (#1, #3 and #4) need to be chamfered (chucking) reamers. \\ | ||
| + | The ends have a short chamfer that will enter the blind bushing bore and not hit the rear of the bore before finished cutting the bushings. \\ | ||
| + | The reamer for #2 cam can be a tapered bridge reamer on models with nosecone ignitions. \\ | ||
| + | (the hole for #2 cam is open to atmosphere so the reamer has plenty of room to extend past the bushing) \\ | ||
| + | Else it will also need to have a chamfered end. \\ | ||
| + | |||
| + | Cam cover reamer sizes: \\ | ||
| + | 1986-1990: | ||
| + | 9/16" for the pinion shaft and idler bushing. \\ | ||
| + | 1-1/8" for #2 cam bushing. \\ | ||
| + | 11/16" for #1, #3 and #4 cam bushings. \\ | ||
| + | |||
| + | 1991-up: | ||
| + | 5/8" for the pinion shaft bushing. \\ | ||
| + | 1-1/8" for #2 cam bushing. \\ | ||
| + | 11/16" for #1, #3 and #4 cam bushings. \\ | ||
| + | |||
| + | ==== Outer Cam Bushings ==== | ||
| + | (AKA Case Bushings): \\ | ||
| + | A single reamer is all that is needed for the case side bushings as all the cam bushings are the same size in the case. \\ | ||
| + | The normal way of reaming the case bushings is to split the case and ream case bushings by using the cover bushings as a guide. \\ | ||
| + | This will require a bridge reamer with a tapered end. \\ | ||
| + | |||
| + | If reaming the case bushings from the outside of the cover bushings, you'll need a chamfered (chucking) reamer with a short chamfer. \\ | ||
| + | The long taper will go in and touch the flywheel before the blades have a chance to cut into the reamer. \\ | ||
| + | So reaming the case side bushings will not be possible with a bridge reamer from the outside of the cover. | ||
| + | |||
| + | Case bushing reamer size: \\ | ||
| + | |||
| + | 11/16" for #1 thru #4 cam bushings. \\ | ||
| + | |||
| + | | Cam bushing reamers ((photo by decman of the XLFORUM http://xlforum.net/forums/showthread.php?postid=5016753)) | | ||
| + | |{{:techtalk:ref:tools:cam_bushing_reamers_by_decman.jpg?direct&300|}}| | ||
| ===== Calculating Pre-Ream Drill Hole Sizes ===== | ===== Calculating Pre-Ream Drill Hole Sizes ===== | ||
| Line 81: | Line 119: | ||
| ===== Pre-Ream Drill Hole Size Chart ===== | ===== Pre-Ream Drill Hole Size Chart ===== | ||
| - | From Rock River Tool Inc. ((https://www.rockrivertool.com/documents/pre-ream-drill-size-chart.pdf)) | + | A PDF of this chart can be downloaded from Rock River Tool Inc. ((https://www.rockrivertool.com/documents/pre-ream-drill-size-chart.pdf)) |
| ^Reamer diameter \\ fraction - decimal (nom)^Hole size \\ to leave 2%^Drill size \\ to leave 2%^Hole size \\ to leave 3%^Drill size \\ to leave 3%^ | ^Reamer diameter \\ fraction - decimal (nom)^Hole size \\ to leave 2%^Drill size \\ to leave 2%^Hole size \\ to leave 3%^Drill size \\ to leave 3%^ | ||
| |1/8" - .1250"|.1225"|31|.1213"|3.0mm| | |1/8" - .1250"|.1225"|31|.1213"|3.0mm| | ||
