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crankcase assembly

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Please, i need a little advice on my main bearing assembly (500T).

There was what looked like a shim the same size o/d as the timing side roller bearing, under it, and covering two holes in the case. should this be there? and what is it for?

The other case has what the parts list calls an oil spacer ring. I have found some info on which way round it goes, but they conflict. My guess would be it goes in to direct oil to the outer ball bearing? but I am not sure.

any help appreciated, thanks, Martin

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I would suggest the shim is there to get the correct end float on the crankshaft. And someone may have drilled the holes at some time to help get the bearing out of the case?

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Previously ian_soady wrote:

I would suggest the shim is there to get the correct end float on the crankshaft. And someone may have drilled the holes at some time to help get the bearing out of the case?

Thanks Ian, that would explain it. just need to figure out the drive side bearing spacer. There is a post on here that says notches face the flywheel to lubricate the outer ball race, but shouldnt they face the outer race to direct oil to it?

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I can't help with the spacer (Mr. Frank's book is silent on the matter!) but I would agree it makes sense to direct the oil to the bearing. However, another view might be that it directs oil away from it to reduce leakage!

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Previously ian_soady wrote:

I can't help with the spacer (Mr. Frank's book is silent on the matter!) but I would agree it makes sense to direct the oil to the bearing. However, another view might be that it directs oil away from it to reduce leakage!

Hi Ian,

As is Mr Garretts book! However, in his OHC section, he refers to the removal of the timing side bearing, in which "in the event of it not being of the shielded type, a large pen steel washer will be found in the bottom of the bearing housing".

I've just fitted the ds bearings with the spacer notches facing the sprocket. Studying the oil flow around the ring, it still allows oil to drain into the lower hole in the case, but some will go into the void to meet the ball bearing. Whereas the other way round, none but a bit of mist would get there.

I would rather not have guessed which way round it should go, but if I've got it wrong, more oil than should be expected would drain from the bottom of the exterior drive boss - not the end of the world.

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Martin, this photo is of my 19s drive side casing not 500t. this is as i found it when i stripped the engine down. is that the bearing spacer you refere to.

Barry

Attachments 19s-case-jpg
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Hi Barry,

indeed it is, and it looks like your notches are facing the ball bearing. My mind is now at rest. I hope you didn't strip your engine to investigate an excessive oil leak from the drive side of the engine!

Thanks (and thanks for pic')

Martin

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glad its of help .i stripped the engine just to see condition of things with a view to a rebuild at a later date.

this is a clearer photo

Barry

Attachments 19s.jpg
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Thanks again Barry, that's the way i have put mine in, but considering your picture, I wonder if it really matters which way round it goes.

If it were put in the other way the entry / exit notches would only be 1/4" further away from the ball bearing. As such I'm sure the oil would have no difficulty reaching the bearing.

On the other hand, I wonder if placing notches at 6 and 12 o'clock in line with entry and exit holes in the case, would limit pooling? So maybe place the notches a touch off alignment to form a pool? Maybe even this is of no consequence.

Martin

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wondering if it acts like a baffle to slow down the amount of back pressure going outbound into the primary cases.

Barry

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Hi Barry,

I reckon there's something in that, which would take with it some of the oil to the ball bearing.

All things considered, I think It will be ok.

I dont remember having to come to terms with other marques idiosyncrasies in such number as I've found delving into a Norton single - not that I know Norton twins.

Next stop, Mike Pem' with the crank.

Ian and barry, thanks

Martin

 


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