500 Left side main bearing

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Cactus
Posts: 9
Joined: 02 Sep 2021 04:04
Location: Australia

500 Left side main bearing

Post by Cactus »

The saga continues, can anyone recommend a supplier of a left hand side main bearing please?
'It must be a .....'
Posts: 403
Joined: 12 Sep 2010 12:25

Re: 500 Left side main bearing

Post by 'It must be a .....' »

I'm certain it's no longer available from SKF?

Search this forum for information on alternative solutions
eg viewtopic.php?p=33057#p33057

Good luck in the quest and let us know how you get on, Ian
simonnorthroad
Posts: 432
Joined: 16 May 2017 10:57
Location: Bath, UK

Re: 500 Left side main bearing

Post by simonnorthroad »

I have at least one. I'm in Bath. PM me. I'm keeping one back for my 500/5
3potjohn
Posts: 1333
Joined: 02 Jun 2007 13:58
Location: Devon

Re: 500 Left side main bearing

Post by 3potjohn »

I think my 501 has a modified main bearing. I have receipts for this but am currently many miles from home so cannot confirm. The original has an ID of 33 mm which is rare or extinct in the wild.
If you can get that one so much the better.
Otherwise and if I understand the situation options are
Get a replacement 33mmid bearing.
Get a modification to accept a 30mm ID bearing.
Get a bearing as above then get the vintage bearing co to modify it.
Cactus
Posts: 9
Joined: 02 Sep 2021 04:04
Location: Australia

Re: 500 Left side main bearing

Post by Cactus »

Thanks
simonnorthroad wrote: 25 Dec 2024 10:04 I have at least one. I'm in Bath. PM me. I'm keeping one back for my 500/5
Thanks simonnorthroad, I’ve managed to get one from Mdina Italia
Cactus
Posts: 9
Joined: 02 Sep 2021 04:04
Location: Australia

Re: 500 Left side main bearing

Post by Cactus »

Cactus wrote: 30 Dec 2024 14:56 Thanks
simonnorthroad wrote: 25 Dec 2024 10:04 I have at least one. I'm in Bath. PM me. I'm keeping one back for my 500/5
Thanks simonnorthroad, I’ve managed to get one from Mdina Italia
Well, at least it’s ordered!
Cactus
Posts: 9
Joined: 02 Sep 2021 04:04
Location: Australia

Re: 500 Left side main bearing

Post by Cactus »

Wellll, I’ve got a new left side main bearing from MDina Italia which apparently is a modern replacement for the original. After having the new bearing pressed into the crankcases the next problem has arisen. The crankshaft, which I believe should just ‘slip in’ doesn’t. A few gentle taps don’t help! Help, any suggestions?
3potjohn
Posts: 1333
Joined: 02 Jun 2007 13:58
Location: Devon

Re: 500 Left side main bearing

Post by 3potjohn »

What is the OD of the crank journal
What is the ID of the bearing
I suspect there is a 3mm difference
Cactus
Posts: 9
Joined: 02 Sep 2021 04:04
Location: Australia

Re: 500 Left side main bearing

Post by Cactus »

I will be getting them measured at an engineering place in the next day or so ( I don’t have the tools for this) but a rough measurement wth a vernier gauge indicates a difference of about .25 of a mm.
3potjohn
Posts: 1333
Joined: 02 Jun 2007 13:58
Location: Devon

Re: 500 Left side main bearing

Post by 3potjohn »

OK- what are the numbers on your new bearing?
Accirding to my invoices mine looks to have been modified to accept a readily available size bearing, if/when it sees daylight I will know.
It says 240111Mod on the receipt in my file.
Cactus
Posts: 9
Joined: 02 Sep 2021 04:04
Location: Australia

Re: 500 Left side main bearing

Post by Cactus »

Yep, thats the one thats in it.
3potjohn
Posts: 1333
Joined: 02 Jun 2007 13:58
Location: Devon

Re: 500 Left side main bearing

Post by 3potjohn »

That is interesting . I’ll revisit my folder in case there is mention of either bearing or crank modification.
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