timing side mainshaft bearing different?

Douglass Harroun · Sep 28, 2011

Anybody notice the original timing side mainshaft bearing has smaller balls and thicker sidewall than replacement? ( '71 Commando). Different side load / carrying capacity? Significant?
Doug

timing side mainshaft bearing different?

stockie2 · Sep 28, 2011

Doug,

Would you want to run balls or convert to latter spec roller bearings? Probably the time to put in super belnds, but you will need to adjust end float.

Cheers richard

pete.v · Sep 28, 2011

Are we talking crank or gearbox here?

I am going to gamble on gearbox, so I would say that a good quality ball replacement will be just fine. No particular load here other than the normal requirements. No history of quirky failures that I am aware of .

Douglass Harroun · Sep 28, 2011

To clarify: These are mainshaft bearings from the timing side of the gearbox
Doug

DogT · Sep 28, 2011

Don't know where you are, but I trusted Mick Hemmings with all my gearbox bearings and no shimming. No rollers, ball. Up to you.

Dave
69S

Torontonian · Sep 28, 2011

Don't know. But I do know drive side mainshaft takes way more forces than the timing side ,and that's why I have fitted a big roller bearing in there. And you all know my thoughts on replacing all layshaft bearings with roller equivalent as a safety concern. Peter.

kraakevik · Sep 29, 2011

I've had heavy-duty ball bearings fail on the timing side twice--first with original bearings 3000 miles from new--and then again with a premium, extra-ball bearing that destroyed the cages and pounded the balls into deformed pellets. I have never had a Superblend bearing fail in the engine or gearbox on my mega-mile Combat

Tim Kraakevik
kraakevik@voyager.net

stockie2 · Sep 29, 2011

Okay, so we are talking gearbox, I missed that sorry. I have only fitted the ball bearing types. Just done my gearbox, replaced 1st gear bush etc. And the TS side balll was rough. But rollers would not control endfloat, and maybe load up the circlip on the DS of the mainshaft? So how do control mainshaft endfloat?

Richard

cash · Sep 30, 2011

Could it be as it's an imperial size bearing and it's cost effective to it make like that :roll:

Cash

timing side mainshaft bearing different?

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