Scorred line on the cylinder wall.

[Jenya]

Hello all,

Today after picking up the cylinders from the shop where they did the honning, I've noticed that one of the cylinder has a pronounced scrorred line. I can even feel it every so slightly with my finger nail.
For some reason I didn't see the line before the cylinder was honned. Maybe I wasn't looking carefully enough.
I asked the guy at the shop if this is a problem and he said that this is absolutely nothing to worry about. 

What is you opinion?
http://picasaweb.google.com/taijinian/Cylinders?authkey=Gv1sRgCO6ZxaG2pP7SmwE#

Jenya

[ineedanap]

where is it?

[Big Shot]

Pics would help...

[jeremy_nash]

looking at those pics, I would definatly take it back to them, wether they think it matters or not, I would think it will matter.  and guys, right click the boxes, select properties, copy and paste the url into new browser window, and wala  up pops the pictures!

[Big Shot]

Boxes...  I don't see no stinking boxes?!!

[Jenya]

Yeah, so strange. In Internet Explorer the pictures are enmbedded straight into the post. With FireFox, I see no neither boxes nor pictures. I've added an URL to my Picasa album where the pictures are.
Let me know if that helps.

Jerymy, as far as taking it back to them, what's the purpose? You don't think that is something they've created when they were honing the cylinders, do you? What will I be attemting to acheive by taking these cylinders back to them?

[Big Shot]

Got it now Jenya, thanks!

[Lukewarm Wilson]

Take it back, better still take it to someone who knows what there doing the cross hatch is terrible  did he only move the hone up and down by 5cm and he obviously stopped the hone at the bottom of the cylinder and draged it out hence why you now have a new oil gallery in your motor I forsee a lot of blue smoke coming if you leave it like that. I did better then that 20years ago on my first attempt.

[Jenya]

Do you thinkl these cylinders are still salvagable if I take them to another place that does a better job?

[sledge]

Yeah, I agree, its a terrible attempt, even without the scratch. Honing is basicaly a controlled polishing process, it removes very little metal from the surface and for it to be effective it must be done properly. I have found that very few people know how to do it properly.....The link takes you to a very good article on the subject.

http://www.realclassic.co.uk/techfiles/tech05010600.html

I doubt another hone will remove the scratch, it looks too deep, you could run with it and take a chance on the consequences but I think a rebore is the only way to fully remove it.

If the scratch was there to start with a good shop would have noticed it and pointed it out to you, even if only to cover themselves.

[The Buddha]

You can feel it let alone see it, its dead.
@60K I split a motor that was really still having visible hone marks and not much else in the good cyls.
They absolutely did it unless it was there before you took it there, in which case they should'da told ya its F*(ked up.
It can happen when running ... usually within 1-200 miles after fitting it together. If your rings are gapped too little, you get everything hot and the ring gap goes to 0 and it promptly tears up the cyl wall. Once you get to that 500 mile mark and you've got it all bedded in it usually does not happen unless you really really got it very very very very hot ... in which case it will seize from heat like this masterpiece I have did.
No feel able scratches ... hell no.
Cool.
Buddha.

[natedawg120]

+1 to budda and sledge.  It shouldn't have that line and if it shouldn't have been there before because like they have said any shop should have looked at it and said "nope its done."  I mean i would have said that and i have only rebuild two engines. 

[coll0412]

It really depends where you are in terms of buying parts and such.  Basically if you bore it out 0.5mm then you have to buy new pistons that are 0.5mm larger in diameter(available as an OEM part), or the other option is to find a new cylinder jug. In that case you are looking at buying it, and having to have it honed again.

To be honest, as long as its not a ridge and is only a scratch into the surface, I don't see a huge issue with running it. Worst comes to worst in 10K you have to replace the pistons and jugs a little early because of premature wear. The piston is not going to self destroy because of a little scratch, you will just have a bit more blow-by and oil consumption.

To me it would be just an issue of cost and time. If it going to cost you $300 to fix it, or just some new rings and a gasket set(~$120) then it depends on how you feel it is important for the engine to last 40K

[5thAve]

Jenya, Picasa doesn't alllow hot-linking from forums like this. Any time you 'fix' the link it will break again. Use photobucket or someplace else.  Sucks 'cause I like Picasa a lot otherwise.

Sucks about that scratch.  I just sent mine for boring and I sure don't want it to come back like that!

+1 on what the others said:  the scratch is a deal-breaker.  Also the honing job is lousy.  Sorry it happened to you!  Now go get 'em.

[jeremy_nash]

take it back to them and tell them to hone the scratch out.  was it there when you took it to them?  either you could have them bore it out, or find another GOOD cylinder