Topic: Switching Top Engine Cases: Does This Affect Journal Size?

[crazypj]

Sorry, should probably have been more specific.
Use a guide bushing when drilling to keep drill centered on stud.
If you don't use one and drill starts to wander, then you use Dremel with 1/8" oval carbide burr.
When it's messed up, you still have to remove all the broken studs before welding, may have to open hole up more to get good weld (better to let weldor look at it)

[754]

A snug fitting sleeve in the hole, the ID is tap drill size, or easy out size.. In effect you have made a drill bushing.. With a good drill it will go straight ...even with a hand drill.

 Didnt tell you at first cuz I thought about it a few times, and only come up with that this morning.. Dont rush and sometimes a good solution will present itself.

 The oil filter is tricky.... Might be able to make a drill guide out of big bar sock....around the OD of the filter, clamp on and drill through then tap..but tricky.. So is clamping it in a machine tool.

[CycleRanger]

Cases are cheap for. Mid year 750,s I doubt anyone could linebore a mismatched set and fit stock bearings..and what if the trans bearings are off a bit.
 Just fix one or the other.

I agree...get another set

After seeing the pictures, I have to agree with Mike.

[754]

The other thing I should mention..
 If welding and re tapping.. Use a good quality tap.. Dont weld up a hole a retap, unless you get a good fit of thread...be a shame to do all that and have the stud come out anyway..or keep loosening off.

[bhh1989]

I'm thinking the broken stud half is doomed. It's beyond what I am willing to pay to have it all fixed at this point. After the drill bit wondered off leaving half the stud still in the hole, getting the hard steel away from the alumunin (which every manner of material-removing tool desires over steel) the thing is a wreck. The final blow was when trying to tap out some of the steel with a chisel cracked the mating surface from the stud to the cylinder hole.

The broken stud half would require all the current area etched out, weld built all up in every direction, then have the top milled flat again and the cylinder hole area milled perfect.. probably hundreds of dollars.


So plan B. I am going to try and get the oil filter part fixed instead. And most likely have someone else do it.