Are the IM shaft bearings replaceable?

[Cinnabar325is]

Common sense would say that they are. However, I can't seem to find new ones anywhere. Searching through the archives here led me to a post by one knowledgeable person who said they aren't and another who said they are.

What gives?

My bearings have some checking on the surface and the outer bearing is even chipped on the edge.

Thanks.

[whodwho]

They are available and need to be sized/reamed

11 11 1 280 863
11 11 1 264 196

[riceh8r]

yes, and will require a machine shop. this is not a diy project.

[jlevie]

Correct!

Although listed as NLA, the bearings are availble if order by part number. The part numbers are:
11-11-1-280-863
11-11-1-264-196

Measure the IM shaft diameter, chuck the bearings up in a lathe, slow speed,
cut to initial size. Use a standard cam bearing installation tool and install
them in the block, they will crush and become smaller then the diameter of the
shaft. Hand finish with a brake cylinder hone, low speed and a little goes a
long ways. Test fit, finish sizing with green scotch brite. Oh ya, make sure
the front bearing lines up with the oil feed hole from the #1 main bearing
feed (The second bearing does not matter as it is fed through the shaft from
the front journal)

You want about .0001-.00015" clearance, I would say .0002" max.

[SpecM]

^ sheesh Jim, you make it sound like its as easy as adjusting valves

[Cinnabar325is]

Great info, thanks guys. Anyone know for sure if they're available some place other than the dealership?

[nando]

anywhere that can order BMW part #s can get them. For example: blunttech.com