Removing layshaft roller bearings

A

Andy Mac

Full member
Hello all,

I have made a late decision to replace the roller bearings on the SFC1000 layshaft and, having removed the circlips, washers and outer races, do not have any means of removing the inner races.  I have a bearing puller, but there is no lip for it hook behind,as the shaft on one side and thrust washer on the other mask the inner race lips.

I thought of grinding them off, as I did with the steering head stem lower race, but am reluctant to do that with the gearbox shaft.  I am planning to buy a micro blowtorch to locally heat the races, but then still need something to draw them off????

Anyone got a cunning way of getting them off?

Cheers, Andy
 
I use a press and a bearing spilitter, no point heating bearing races to remove them, because of the light interference fit any advantage gained from expanding the race is lost in heating the shaft through conduction. Using differential temperatures only really works when fitting parts, for example there is no advantage to be gained in heating a cylinder head to remove valve guides.
  Take it to your local freindly engineering shop and ask them to press it off for you, he will probably ask you why you are bothering as there is nothing wrong with the bearing...


  Keith.
 
Thank you Keith,

Never assume....!

One bearing had picked up debris and both rollers and races are ridged - I personally would not refit such a bearing and then wonder why I had not if it then subsequently failed.  Of course, it might not fail and could go on for thousands of miles.  But then again,  it might not and is it worth that risk, given that it is exposed - I don't think so!

Andy 
 
laverdakeith said:
I use a press and a bearing spilitter, no point heating bearing races to remove them, because of the light interference fit any advantage gained from expanding the race is lost in heating the shaft through conduction. Using differential temperatures only really works when fitting parts, for example there is no advantage to be gained in heating a cylinder head to remove valve guides.
  Take it to your local freindly engineering shop and ask them to press it off for you, he will probably ask you why you are bothering as there is nothing wrong with the bearing...


   Keith.
Click to expand...

Keith, don?t the different expansion coefficients come into play?
The way liners fall out of the barrel when heated would bear this out.
I was taught to heat heads for removal of guides. Certainly not as great a difference as when fitting I agree.
With disassembly of same metals I totally agree though.
Ciao
Lee
 
Lee, you are comparing apples with oranges.
Aluminium alloy expands faster and further than steel does so a liner in a barrel or a guide in a head will be a different matter to a steel bearing on a steel shaft.
 
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