What is this?

What is this?

Author
Discussion

TwinKam

Original Poster:

3,009 posts

96 months

Sunday 29th January 2017
quotequote all
'98 4.2
Found this in my drained oil... does anyone who's had one of these apart recognise this? ('Expensive', is not a desired answer wink)
It looks as though the ends were once spot welded to something, forming a 'bridge', not unlike the top fastener on a pair of trousers.






Edited by TwinKam on Sunday 29th January 16:17

TwinKam

Original Poster:

3,009 posts

96 months

Sunday 29th January 2017
quotequote all
Hi Peter, yes, I thought it was about time I did! Thankfully that was the only lumpy bit!...

TwinKam

Original Poster:

3,009 posts

96 months

Sunday 29th January 2017
quotequote all
Thanks Paul, that had crossed my mind, it doesn't look like any part of an engine that I can think of and I've had a fair few apart, but never an AJP8.
I was going to start a thread concerning the most random item found in the valley, just a couple of coil bolts and a deep fried bee in mine... rather disappointing!

TwinKam

Original Poster:

3,009 posts

96 months

Sunday 29th January 2017
quotequote all
Thanks for your vote of confidence too, Jody. No, it definitely was never a needle roller in a previous life.

TwinKam

Original Poster:

3,009 posts

96 months

Sunday 19th February 2017
quotequote all
Is that a lock-tab lurking in the darkness?

TwinKam

Original Poster:

3,009 posts

96 months

Monday 6th March 2017
quotequote all
ukkid35 said:
TwinKam said:
Is that a lock-tab lurking in the darkness?
It's a fairly beat up washer, and it isn't coming out anytime soon.

However it's been captured by the plug magnet so I doubt it can do any more damage.
Looking at that again, Paul, it looks to me like the drive-tab of a 'helicoil' fitted in that thread...

TwinKam

Original Poster:

3,009 posts

96 months

Monday 6th March 2017
quotequote all
Fastpedeller said:
TwinKam said:
'98 4.2
Found this in my drained oil... does anyone who's had one of these apart recognise this? ('Expensive', is not a desired answer wink)
It looks as though the ends were once spot welded to something, forming a 'bridge', not unlike the top fastener on a pair of trousers.






Edited by TwinKam on Sunday 29th January 16:17
It looks like a straightened staple to me! I am being serious.
Thanks Fastpedeller, but no, it's not a staple.
I don't think it's been altered by passing through the engine ie hasn't been bent or straightened, and the areas of flattening at each end are identical, it's definitely been made in that form.
I think ukkid was correct when he suggested that it was foreign to the engine, could be from a tool.

TwinKam

Original Poster:

3,009 posts

96 months

Friday 10th March 2017
quotequote all
tangerinedream said:
Foreign = Bad... it's like effing Brexit all over again...

http://www.pistonheads.com/gassing/topic.asp?h=0&a...
In this instance, Foreign = Not belonging in this place... oh dear... that'll be the next word to be banned by the PC brigade then! laugh

TwinKam

Original Poster:

3,009 posts

96 months

Thursday 23rd March 2017
quotequote all

So, sump removed today (with the block upright) and found this little lot, all ferrous. Another 10 of the same stapley things (incl one broken) to add to the original that came out with the drained oil, and enough slightly curved bits to make an 88mm (eek) diameter circle... and some to spare... Of course, there may have been more that fell out with a previous oil change.
I've not taken the heads off yet, but what I can see of the bores and pistons is perfect, all skirts and lower ring lands are intact, the outsides of the skirts (visible when pistons are BDC) are like new with no scuffing whatsoever, no scratches in any of the bores, in fact the cross-hatching is still present. Therefore I can't see it being bits of ring material.
On a positive note, I had a couple of caps off and the shells are good. So as far as the oil starvation situation goes, I think I got away with it (see separate thread).
But this debris is bothering me. Your opinions please, Gents...

TwinKam

Original Poster:

3,009 posts

96 months

Thursday 23rd March 2017
quotequote all

Oh, I also found these ...top bolt and bush from the long OS chain guide.
Considering what it had to go past to get into the sump, I consider myself pretty lucky there too!

TwinKam

Original Poster:

3,009 posts

96 months

Friday 24th March 2017
quotequote all
thekraken said:
I've fished odds and sods out of the v of mine .. but you win hands down the game of worrying engine debris top trumps.......
A dubious honour and one I would gladly forego!

Thunderroad said:
Could it be out of the oil filter? Has anyone stripped an oil filter down? Perhaps there is something like that inside one? idea
There's nothing like that in an oil filter, but if it had come into the engine in the oil, it would've had to pass through a shell bearing, leaving a fair bit of evidence...

thekraken said:
Any feed back from Powers as to what is could be ??? I'd want Doms opinion....
Good idea, I'll get in contact with him.
The more I consider it, the more I believe it all to be parts of an oil control ring. The curved bits being the scrapers (but with 80% of one missing...?) and the stapley bits being the spacers that keep the two scrapers apart. I've seen many different types of bottom rings yikesredcard , what I need to know is what type TVR were using at that time.
No getting away from it, I'm going to have to pull the pistons.

TwinKam

Original Poster:

3,009 posts

96 months

Friday 24th March 2017
quotequote all
Thanks jhonno, conventional type then.
I was wondering if it was like type B here

TwinKam

Original Poster:

3,009 posts

96 months

Friday 24th March 2017
quotequote all
ukkid35 said:
TwinKam said:
I've not taken the heads off yet, but what I can see of the bores and pistons is perfect, all skirts and lower ring lands are intact, the outsides of the skirts (visible when pistons are BDC) are like new with no scuffing whatsoever, no scratches in any of the bores, in fact the cross-hatching is still present. Therefore I can't see it being bits of ring material.
So if we accept that it is indeed ring debris, how on earth did it get there without destroying everything in sight?
My point exactly. The only scenario that makes sense (and then not a lot) is that the sump was never cleaned out after a previous blow up!

TwinKam

Original Poster:

3,009 posts

96 months

Saturday 25th March 2017
quotequote all
Pics to follow later, but... pistons are out and...





















...all rings intact. In fact, I have never in all my engine-stripping-years, stripped an engine that was in such perfect condition! biglaugh

TwinKam

Original Poster:

3,009 posts

96 months

Saturday 25th March 2017
quotequote all
Aint nuttin wrong with any of this lot woohoowoohoowoohoo

TwinKam

Original Poster:

3,009 posts

96 months

Saturday 25th March 2017
quotequote all
...but worth all the effort and expense if only just for peace of mind, and to renew these, they are on the point of collapse in the jacket but all the important sealing areas have done their job well for (I believe) 19 years/ 40,000 miles. smile

TwinKam

Original Poster:

3,009 posts

96 months

Monday 27th March 2017
quotequote all
Thekraken said:
From a previous post there was an outside chance of it being foreign debris......but now......eeekkkk!!! Doesn't look at all good!!! Has to have come from somewhere......and you make an excellent case for a lower ring giving up the ghost!!!!
I've fished odds and sods out of the v of mine .. but you win hands down the game of worrying engine debris top trumps.......
Any feed back from Powers as to what is could be ??? I'd want Doms opinion....
Great advice, thanks. I emailed the pics to Dom and he sent me this image back. The debris in my sump is the remains of the cage from the crank nose roller bearing...

I hadn't looked at the cover bearings as I was going to replace them all regardless; the rollers dropped out of the cover whilst I was giving it an initial wash and have stayed in the wash tank since! So a very public acknowledgement from me to Dom's knowledge and experience.
The irony is, that was (and remains) the least of my worries biglaugh