MTFCA Forum

Need to know the inside diameter of the axle housing where the sleeve fits (without sleeve in place)? Or what the diameter of the replacement bearings that slide into the housing? Thank you Les for the idea you had in one of your post about a question I asked some time back, re using Model A hubs.

Mark, I don't know why you need the measurement, but the replies will vary if they come from making measurements, rather than quoting a factory published dimension. When I was making floating bearings I found that the tube internal diameters varied as much as .012". With the length of the bearing carrier and the use of a flexible sealant around it, this variance could be overcome. Given the rough finish inside the tube, an accurate fit will be a compromise of sorts, but custom turning components to each housing meant a close fit could be achieved.

Hope this helps.
Allan from down under.

Allan wrote: ↑

Thu Feb 20, 2020 7:27 am

.....but the replies will vary if they come from making measurements, rather than quoting a factory published dimension.

Hope this helps.
Allan from down under.

I agree with the above quote and will add this; the last 3 or 4 rear axles that I have done the dimension at this point has always been higher than what is quoted from the MTFCA axle book. On page 21 it says it "approximately 2.210 inches." but they may also be worn or have been made oversize. I support the "oversize" statement from the book. The last axle that I had done, the inside dimension was 2.180" to 2.240", depending on where you measured. This "inconsistency" was not because the axle housing was worn at this point but rather the original machining was done poorly. Looking at the inside where the sleeve would go (on both axle housing halves) you could see that the cutting tool was dull and they were running it too fast. Lots of machining marks and smooth "wear" spots where the sleeve was making contact, that is where the 2.180" dimension was coming from, wear spots 180 degrees opposite one another. The rear axle that I had done previous to this one was the same way. Hopefully someone will post with what the factory blueprint/spec. "should" be. Until then, as Allan had said, the replies will be from making measurements.

I have an idea that I am working out. I did some checking on the housings I have and was finding the measurements all over the place. It sound like because of the way the bore was turned, the best approach might be to do a hone, re install the sleeves get the measurements then add the thickness of the sleeve to get the average for the outside diameter that I would need.

Thanks guys for the replies, I think we are going to approach this idea of mine from a different way.