Line boring crankcase

[roialex]

Originally Posted by tharbert

Yes. The case warps as it's unbolted. There is a recent thread where someone tried to reassemble a mag case without it being machined. The crank seized as soon as he tightened the thru-bolts.

it's me ahahaa

[cmcfaul]

Olies is a good call. Probably want the oil bypass mod and Case Savers instaled while you are at it.

Chris

[prschmn]

Before anything is done the bore diameter should be measured. Often you'll find that it has actually become smaller and if that's the case it can be line honed-not bored into spec without having to surface the case halves. You do need to put an alignment plug in the intermediate shaft bore
to get a good result though. Most of the rigidity is in the mainline and a few out on the perimeter
isn't a big deal. I do usually install locating sleeves towards the center as a precaution.

[faapgar]

Good advice from Mark.If the straight edge is flat on the case halves sometimes all you need is a clean up line hone.Fred

[DaveA]

Send the case to Olies. Excellent work and fair price. End of story. R/Dave