bearing shell opinions please?

bearing shell opinions please?

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Discussion

V8Bart

Original Poster:

788 posts

189 months

Wednesday 3rd February 2016
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Just wondering if anyone with experience could please give there opinions of the below pics, anything look off? potential reasons? etc.
Sorry for being so vague.






C15

350 posts

242 months

Wednesday 3rd February 2016
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Where are the rest? What happened?

More photos of the bearing backs and crank journals would help... Especially if they came out of a failed engine..

I worked in bearing design / manufacture and failure analysis for 14years if you want to know more pm me.

I may be able to help out...

V8Bart

Original Poster:

788 posts

189 months

Thursday 4th February 2016
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Thank you. Pm sent

QBee

20,903 posts

143 months

Saturday 6th February 2016
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Is this more recent than when we met at Cadwell Park after your engine broke? Or is it the same one?

TVR Beaver

2,867 posts

179 months

Saturday 6th February 2016
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how many miles on them??

V8Bart

Original Poster:

788 posts

189 months

Sunday 7th February 2016
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Anthony, it's another situation after that, not been on the road much.

Hi John, that was what I wanted other people to guess. I'm told they are supposed to be 1k.

TVR Beaver

2,867 posts

179 months

Sunday 7th February 2016
quotequote all
TBH, the white metal is very soft, and it's designed this way to mould itself to the journal taking off high points giving it a uniform oil gap... so I'd not be surprised to see something like this at 1K... just maybe not that much??... they will then be like this for ever... just part of the bedding process....
Not sure where it’s gone from the thrust sides?
And why some of them have big pitts on the face... looks like its not been clean to me more than anything? may be bits of something under the shells?..
BTW... you should never re-use them once they have been in... this is when you get them spinning if you do wink

Edited by TVR Beaver on Sunday 7th February 19:49

C15

350 posts

242 months

Sunday 7th February 2016
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Ian,

Still waiting on more info??

The thrust face is worn and probably due to high clutch load, improper end float or it would happen if the crank was forced backwards due to fialure. The bearings arent white metal.. They are VP2 type and therefore very hardwearing.. The scoring indicates that a lot of foreign particles went from the mains into the bigends. The odd face wearing on the one main would indicate crank bending moment due to either wrong installation / bad crank, or failure elsewhere.

Bearings never fail.. They are always an indication of a problem elsewhere.

TVR Beaver

2,867 posts

179 months

Sunday 7th February 2016
quotequote all
as i say.. i think dirt under the shells and/or on the face to some extent. A slightly lifted (not bedded) shell can look like this... How do you know they are VP2 and not VP19?... having worked with Glacier for many years, you'd have to specify VP2 bearings, where as std you'd get VP19's.. These don't look anything special to me?.. smile

I'm not sure the trust has had anything on it to start with.. they don't looked rubbed up to me (ie, they have little if any rotational markings)... What make are the bearings Ian... do they have markings on the back....



Edited by TVR Beaver on Monday 8th February 09:01

Boosted LS1

21,165 posts

259 months

Sunday 7th February 2016
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I've seen worse, a lot worse. OP, have you had any issues with the engine?

V8Bart

Original Poster:

788 posts

189 months

Monday 8th February 2016
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Hi Steve, sent another pm.
Not easy to post lots of information as it's a very complicated difficult situation I'm in and don't want it to turn into he said she said. Just facts.

This is my 3Rd engine failure, These bearings were removed this time after 1k when then engine went again, loud cackling under load then blue smoke.

Boosted LS1

21,165 posts

259 months

Monday 8th February 2016
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I understand OP but what has failed? It may be this pc but I can't see any major damage. How are the crank journals or the rest of the engine?

Blue smoke would be indicative of a ring or top end issue.

Edited by Boosted LS1 on Monday 8th February 13:46

C15

350 posts

242 months

Monday 8th February 2016
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TVR Beaver said:
as i say.. i think dirt under the shells and/or on the face to some extent. A slightly lifted (not bedded) shell can look like this... How do you know they are VP2 and not VP19?... having worked with Glacier for many years, you'd have to specify VP2 bearings, where as std you'd get VP19's.. These don't look anything special to me?.. smile

I'm not sure the trust has had anything on it to start with.. they don't looked rubbed up to me (ie, they have little if any rotational markings)... What make are the bearings Ian... do they have markings on the back....



Edited by TVR Beaver on Monday 8th February 09:01
You too.... I joined in 98 just as the FM takeover happened.... wink


TVR Beaver

2,867 posts

179 months

Tuesday 9th February 2016
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C15 said:
You too.... I joined in 98 just as the FM takeover happened.... wink
Pre 1995... I spent a lot of time with them developing a sintered rotary disc material for the medical industry in their Kilmarnock site, but the guy's were well into motor sport and in real terms we maybe spend a lot more time on engine bearings smile
I'd finished by the FM days... 20 years ago eek

Sardonicus

18,928 posts

220 months

Tuesday 9th February 2016
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The polished areas are normal but fk me you have a lot of contaminates/debris in your oil eek those scratches and scores should not be present frown I'm presuming the journals were serviceable/undamaged on assembly of course scratchchin like mentioned already your smoking is not due to this but I suspect you have a contaminated oil system then it may be bore/ring damage or failed/damaged valve stem seals

Edited by Sardonicus on Tuesday 9th February 10:28

Boosted LS1

21,165 posts

259 months

Tuesday 9th February 2016
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Personally it looks to me as if there has been some scuffing on the shells, slightly tight clearances or maybe an oiling issue but I've seen similar in a lot of engines that have been running happily. There are some odd marks in a few places which may be worth investigating. It would be easier to diagnose an engine issue if we knew what the issue was. Like wise, what does the crankshaft look like?

C15

350 posts

242 months

Tuesday 9th February 2016
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TVR Beaver said:
Pre 1995... I spent a lot of time with them developing a sintered rotary disc material for the medical industry in their Kilmarnock site, but the guy's were well into motor sport and in real terms we maybe spend a lot more time on engine bearings smile
I'd finished by the FM days... 20 years ago eek
Ah... I started in Ilminster then went to Japan when the Japanese took over, where i was an application engineer for all european OEM's when everything went lead-free and the stuff that didnt in motorsports (WRC, F1 & MotoGP, to name a few) wink