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-   -   Can this NOS crankshaft be saved? (http://forums.pelicanparts.com/911-engine-rebuilding-forum/1130451-can-nos-crankshaft-saved.html)

blue72s 11-24-2022 06:43 AM

Can this NOS crankshaft be saved?
 
Below are some pictures of the 66mm crank. Will polishing clear all the rust out or does it require extensive repair?

http://forums.pelicanparts.com/uploa...1669304183.jpg
http://forums.pelicanparts.com/uploa...1669304318.jpg
http://forums.pelicanparts.com/uploa...1669304456.jpg

john walker's workshop 11-24-2022 07:38 AM

Just do it and find out. Hopefully no spun bearing damage.

Neil Harvey 11-24-2022 07:50 AM

Clean it first and mag it to see if its cracked. Then measure the journal sizes. Could save the time and cost to polish it, if its damaged.

blue72s 11-24-2022 08:05 AM

Quote:

Originally Posted by john walker's workshop (Post 11856287)
Hopefully no spun bearing damage.

I've been told it's NOS, so there should be no spun bearing damage.
I haven't bought it yet, hence my question.

Does it look like it's been used?

john walker's workshop 11-24-2022 11:42 AM

Looks like there's a rod bearing half still on a journal in the last pic, so probably used???

blue72s 11-24-2022 06:48 PM

Quote:

Originally Posted by john walker's workshop (Post 11856455)
Looks like there's a rod bearing half still on a journal in the last pic, so probably used???

I think that's just lighting (reflection).

It seems to me that the area for the No. 8 bearing sleeve is quite rusty, maybe even pitted, whereas the rest of the crank is not too bad.

Is this worth saving or scrap?

ChrisHamilton 11-24-2022 09:07 PM

Hard to see without higher definition pics, so this is strictly speculation. I don't know if it all would polish out, but it seems to me that would clean up with a .25 or .5 mm turn under. I would think turning the crank .5 mm (.020) would clean all that up. Most definitely would not be scrap to me. Even if a journal had excessive pitting, that can be repaired.

blue72s 11-25-2022 10:15 AM

Thanks guys.

Pio72porsche 11-30-2022 09:53 AM

If it was me I’d pass. That crank pin closest to number eight main appears to have marks on it like it spun a bearing. The whole thing looks pretty poor, I’d say you’re better off spending the extra money on an excellent one. My two cents anyways

patkeefe 12-01-2022 09:27 AM

Spun bearing is obvious and ugly. I'd tend to agree with Neil Harvey on checking it out first.


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