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| techtalk:evo:engmech07a [2019/11/06 23:49] – [Making 91-03 Breather Bolt Holes Smaller] hippysmack | techtalk:evo:engmech07a [2019/11/07 00:06] (current) – [Making 91-03 Breather Bolt Holes Smaller] hippysmack | ||
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| - | The internal hole on the outside | + | The internal hole on the outside end of 91-03 breather bolts is factory tapped 5/ |
| It's not known at this time why as the thread are not used on OEM Sportsters. \\ | It's not known at this time why as the thread are not used on OEM Sportsters. \\ | ||
| - | Below and for lack of having fine thread 5/16" bolts, course thread SS (5/ | + | Below and for lack of having fine thread 5/16" bolts, course thread SS (5/ |
| But it's easier to go and buy the correct bolts. \\ | But it's easier to go and buy the correct bolts. \\ | ||
| The holding block was needed to keep the bolt straight while boring a hole through it. \\ | The holding block was needed to keep the bolt straight while boring a hole through it. \\ | ||
| - | You could use a block of wood, plastic or steel. The hole was .2720" and tapped 5/ | + | You could use a block of wood, plastic or steel. The hole was drilled |
| Each bolt was screwed into the hole, corner to corner lines drawn across the head to find center and the center punched to keep the bit from wandering. \\ | Each bolt was screwed into the hole, corner to corner lines drawn across the head to find center and the center punched to keep the bit from wandering. \\ | ||
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| An O-ring was added under the head to seal off the original hole. \\ | An O-ring was added under the head to seal off the original hole. \\ | ||
| The factory threads were chased with a 5/ | The factory threads were chased with a 5/ | ||
| + | Normally, marking center on both ends and sending the drill bit in just over half way from each end will make a more straight thru hole. \\ | ||
| + | But this just being a test, the hole was drilled thru from one side. \\ | ||
| + | The hole ended up off center in the thru end but this is not a critical point in this application. \\ | ||
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