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G10 cylinder wall etching
Topic Started: Apr 24 2012, 04:09 PM (1,744 Views)
forthvacav
forhtvacav
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I am in the process of rebuilding my 95 metro G10. Today I used a berry ball to cross etch the cylinder walls, and the middle cylinder has what looks to be some etching in it from the oil ring and a couple of vertical scratches that I can't seem to get out. I only used the berry ball on this cylinder twice not sure if I should keep trying or what. I have pics I took of this but can't seem to figure out how to post them with this post. I can ever so slightly feel these with my finger nail. Has anyone seen this before and it's only the middle cylinder.
Any help on this would be great. :banghead :banghead
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Deleted User
Deleted User

"Etching" from rings on the cylinder walls is a sign that the engine sat without running for an extended period of time. Vertical scratches are from some sort of debris entering the combustion chamber.

For the best results, consider purchasing a set of oversized pistons and rings, and having the block bored to match.

GG
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forthvacav
forhtvacav
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I wish that was the case of setting. I bought this car new and it has over 500000.0 miles on it, may be 215000 on this motor. Now this is the second motor which is a JDM motor that might be the case of setting but since I've had this motor the most it has set is a couple of days. I burned #3 exhaust valve and that is the reason I'm doing the lower end. I already have new std. pistons and rings and just got the pistons back from being put on the pistons rods. Not sure on what really to do.
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wildhair


Go to :type
http://photobucket.com/
set up an account its free
upload your photos
""left"" click on the IMG CODE of the photo you want.
Paste in your post
I hope this helps ;)
This is only one way to post your pictures
there are several others but this was the easiest for me.
Edited by wildhair, Apr 24 2012, 05:06 PM.
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Gasoline Fumes
Metro collector/Honda driver
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I checked my Geo and Swift manuals. Not much info there. I checked a Honda manual (it was right next to me) and found this:
Quote:
 
Some light vertical scoring and scratching is acceptable if it is not deep enough to catch your fingernail and does not run the full length of the bore.
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paul11211


you should of looked at your engine first before ordering a set of pistons, because now your going to need to bore the engine and buy oversized pistons.
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Deleted User
Deleted User

paul11211
Apr 24 2012, 09:11 PM
you should of looked at your engine first before ordering a set of pistons, because now your going to need to bore the engine and buy oversized pistons.
:gp

This.

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Jittney
Anchorage 92 XFi

I took my block and crank to a local machine shop.
They polished the crank, decked the pitted head....and recommended wiping the rusty cylinders with vinegar instead of using a hone ......and go with that.
They could have just as easily told me to have it bored and get larger pistons, but didn't.
forthvacav.....any chance you could have an expert look at your block?
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forthvacav
forhtvacav
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ok here is a picture of the cylinder. as you can see the etching is slight from the oil ring.
Posted Image
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forthvacav
forhtvacav
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I've talked with one guy in a machine shop and he asked did they go all the way the length of the cylinder and I told him no. He has not seen the block yet I just talked to him over the phone and told me to bring it to him. Like others have he stated the etching from the oil ring comes from setting for a peroid of time which he stated is the problem with buying used motors. But like he also stated when I got the motor it had 21,500 on it plus the most likely the etching was on it when I recieved it and I've put about 200,000 on it and only doing the lower end because of head work. So it might be ok but he needs to look at it. What do you guys out there think?
Edited by forthvacav, Apr 25 2012, 11:53 AM.
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Gasoline Fumes
Metro collector/Honda driver
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I'm not seeing a 60 degree crosshatch pattern....
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Scoobs
Member Avatar
:D

I think it needs to go to the machine shop, regardless of what you may think. If not it will consume oil. It must be bored.
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datona paul
Member
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Second that...
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Woodie
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forthvacav
Apr 25 2012, 11:21 AM
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OMFG!!!! That's a mess. If you can see any marks after one light honing, you need it bored out.
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GeoPete
AAS Auto Technology past ASE Master Tech

Might consider sleeving it. Mine was already bored .040 over and scratched from broken ring. I believe the broken ring was caused by the piston to cylinder clearance being out of spec. It was either sleeve the whole engine (about $150) or find a new block. Runs great now.
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