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[JamesV6CDX]

All well just put the piston to tdc and use a torch, there should be a tiny bit of play and give you enough clearance to see if there's anything still there?

Will certainly give that a go

[Doctor Gollum]

Does the piston move smoothly up and down the bore? Any knocks or creaks?

Thinking it could be a bit of wear in the conrod/crank bearing causing the piston to float against the bore under load... if that makes any sense

[JamesV6CDX]

Does the piston move smoothly up and down the bore? Any knocks or creaks?

Thinking it could be a bit of wear in the conrod/crank bearing causing the piston to float against the bore under load... if that makes any sense

Smooth as silk, I can turn the crank using just my hands on the pulley

[X30XE]

Does the piston move smoothly up and down the bore? Any knocks or creaks?

Thinking it could be a bit of wear in the conrod/crank bearing causing the piston to float against the bore under load... if that makes any sense

Smooth as silk, I can turn the crank using just my hands on the pulley

So none of the rings are touching the bores then 

[Doctor Gollum]

All well just put the piston to tdc and use a torch, there should be a tiny bit of play and give you enough clearance to see if there's anything still there?

Will certainly give that a go

Should be minimal slop across the block and zero along it...

[Marks DTM Calib]

Hmm, well it's not top ring as that comes upto the dark line, might be something between the first and second.

See if it will polish out with some fine wet and dry with a bit of WD40 as lube as a starter

[JamesV6CDX]

Hmm, well it's not top ring as that comes upto the dark line, might be something between the first and second.

See if it will polish out with some fine wet and dry with a bit of WD40 as lube as a starter

I ran a little 1800 grit over it with some white spirit... gently...

To be fair there's nothing that can be felt by the bare finger / fingernail at all, it feels perfectly smooth

Do you think something could still be trapped between those rings, or is more likely that it's long gone?

[X30XE]

You compression tested this before you took it apart didn't you? If so it can't be that bad 

[JamesV6CDX]

You compression tested this before you took it apart didn't you? If so it can't be that bad 

No, I didn't - as didn't have any problems with oil burning or low power etc 

[Bigron]

I magnified your photo quite a bit and the mards don't look like scoring at all to me - rather like brush marks, oddly enough, as they are not perfectly strai8ght and dithered at the top of the bore, too. They are definitely on top of the honing marks. As already suggested, solvent and gentle abrasion could well remove them and whatever gets picj
ked up on the cleaning rag may give you a clue as to what caused them?


Ron.

[JamesV6CDX]

Are we SURE this happened with it running, and not since I took it apart?

Reason for asking:

I found this (below) photo, taken a few weeks ago, from after I took the head off, but, before I spun the crank far enough today, to fully lower the no4 piston (the one in question).

The wall looked like this:



So you can see in this picture, immediately after taking the head off, the marks DONT appear to go all the way down, and only stop at where the piston had been sat? Or am I mistaken?

Would this not imply, that whatever is in there, caused the marks to go all the way down there today, when I turned it by hand?

[Doctor Gollum]

Also present on bore 6

[STEMO]

You start your thread with 'bore damage'. I can't see any damage, just a slight marking (not scoring). You have your way of doing things and other people theirs. Personally, I'd put that back together and run it.

[tunnie]

You start your thread with 'bore damage'. I can't see any damage, just a slight marking (not scoring). You have your way of doing things and other people theirs. Personally, I'd put that back together and run it.

Well, what you waiting for? Pop over and put to back together for him. Sure you'd have it done in what, 20 mins? 

[Marks DTM Calib]

Hmm, well it's not top ring as that comes upto the dark line, might be something between the first and second.

See if it will polish out with some fine wet and dry with a bit of WD40 as lube as a starter