Pitted journal and bearing

[sgd37]

Merry holidays to all

I've been slowly getting ready to reassemble my engine, but the more you look the more you see. So I noticed this pit (possibly due to corrosion) on the #4 rod journal which snags on my nail.
http://imgur.com/VzE6OWN
Is the crank still usable since I know you can't grind them on a cb500? Should I polish it?

Second there is a pit on the big end bearing of #3 rod which doesn't snag but can be felt with a finger.
http://imgur.com/f7LaYoo
Does it need replacing? and if so do both half shells need to be replaced?

Thanks for your help

[Bryanj]

For peace of mind I would fit a replacement crank with shells, for a low use bike not used hard they may well both work for quite a while

[Trigger]

I would get the journal metal sprayed, then ground to STD and fit new shells.

[MCTID]

Trigger.....any recommendations for a Company who can Metal Spray and Regrind Cranks (I have some Triumph Twin cranks I want to reclaim).
Cheers.

[sgd37]

Thanks for the reply.

From my own research people have run knicked cranks after polishing. Would this not be a similar situation. Could this lead to engine failure?

Cheers

[Trigger]

Trigger.....any recommendations for a Company who can Metal Spray and Regrind Cranks (I have some Triumph Twin cranks I want to reclaim).
Cheers.

I would use T&L at Bedford. If you phone, wait for Derick's extension number to come up. He is the Brit engineer at T&L 

[kevski]

They look like corrosion marks, if the snag on the rod journal is not a raised one just give it a light polish to take off any sharp edges, and the bearings i would replace, though you could run with that for years oil will fill these while running, it won't lead to engine failure as the damage is very slight and i assume you will not be running flat out for prolonged periods anyway.

[sgd37]

Cheers for the reply and happy new year.

When it comes to polishing could I use the strip of 600 grit and shoelace technique?

[matthewmosse]

If it does prove rough, I think I have a few spare cranks that could be dug out and checked. Are 500 and 550 cranks the same?

[Bryanj]

Yes matt all the cranks are the same (except 650 before somebody shouts) As to the polishing crocus paper with oil

[kevski]

At least 1200 grade, i have a 1200 grade mesh that i use for things like that, i got it when i was a plating tech.

[Bryanj]

1200 is too rough, i got some 3000 somewhere, otherwise known as bog paper with pimples!