bearing shell opinions please?
Discussion
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
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
Edited by TVR Beaver on Sunday 7th February 19:49
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.
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.
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?..
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....
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
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.
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.
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?..
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....
You too.... I joined in 98 just as the FM takeover happened.... 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
C15 said:
You too.... I joined in 98 just as the FM takeover happened....
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 I'd finished by the FM days... 20 years ago
The polished areas are normal but fk me you have a lot of contaminates/debris in your oil those scratches and scores should not be present I'm presuming the journals were serviceable/undamaged on assembly of course 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
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?
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
I'd finished by the FM days... 20 years ago
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) I'd finished by the FM days... 20 years ago
Gassing Station | Griffith | Top of Page | What's New | My Stuff