loose output shaft bearing

  • Wookie58
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Re: loose output shaft bearing

16 Aug 2025 13:28
#916096
I don't disagree with anything you guys have said but I thought I would explain my thought process behind supporting the "staking" option (if you really don't want to split the casing again) Assuming that the bearing is of good quality and that the lubrication system is functioning as it should (and that it's not "dick in a shirt sleeve" loose), I would expect minimal "drag" on the bearing and therefore minimal "rotational" forces being applied to the outer race (unless the bearing fails). I believe staking every 45 degrees with a sharp punch would "get it done". You could paint mark the bearing and case then re-check after 100mls. If it hasn't moved by then  it "probably" never will. Just my opinion 
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  • DoctoRot
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Re: loose output shaft bearing

17 Aug 2025 13:58
#916151
I don't disagree with anything you guys have said but I thought I would explain my thought process behind supporting the "staking" option (if you really don't want to split the casing again) Assuming that the bearing is of good quality and that the lubrication system is functioning as it should (and that it's not "dick in a shirt sleeve" loose), I would expect minimal "drag" on the bearing and therefore minimal "rotational" forces being applied to the outer race (unless the bearing fails). I believe staking every 45 degrees with a sharp punch would "get it done". You could paint mark the bearing and case then re-check after 100mls. If it hasn't moved by then  it "probably" never will. Just my opinion 
 
I agree with this. I have staked a few bearings as a last ditch fix. Works good on wheel bearings on most cars if the bearing is too loose in the hub.

However I decided to do it the right way and pull the engine out again so i could use bearing retaining compound. You can see the brinelling in the pic. Since I had just done the process it went super fast. Engine back out, stripped, and back together in 2.5 hours yesterday. I'll put it in the frame today. 

Using bearing retaining compound is the preferred installation technique for a lot of high speed spindles on cnc routers/mills. I recently rebuilt a 30k RPM spindle and I was asking the engineer why they use bearing compound rather than a press fit on the bearings and he told me it was because it increases bearing life and reduces run-out by removing any possibility of the bearing not seating 100% perfectly. This machine will hold 0.0001"+/- tolerance.

 

 
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