How much longer will this cylinder last.

duramax on fire

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Apr 15, 2015
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Well on top of everything else with this new truck found this scratched up cylinder. Probably happened when previous owner drove with contaminated oil.

Question is will this cylinder last another year until I can afford a rebuild. I cant really get a good response if you can sleeve or not this motor.

Probably a 1/32 to 1/16" deep hard to tell. Im not sure if a .040 bore will clean this up or not.
 

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WolfLMM

Making Chips
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Nov 21, 2006
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A .040 over bore is only going to take .02 per side. So if you're scratches are deeper than .020, that's not going to work. It's hard to tell from the pic, but that doesn't look deeper than .020 tho.

1/16th would be 0.0625. It sure doesn't look that deep, from the pic.
 

Chevy1925

don't know sh!t about IFS
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Oct 21, 2009
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you can sleeve the block. its just whether or not its cost effective for you. and no, i wouldnt drive on that for a year.
 

duramax on fire

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I found a complete short block for 500 with good looking piston walls. I guess I'll have to go that route. Go ahead and hone, re ring and put new bearings in.

Is there any forum members doing machine work any where around dallas
 

Burn Down

Hotrodder
Sep 14, 2008
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That's not oil contamination... Looks like broken rings to me. Look up Josh H. he owns Top Notch Garage in Texas I'm sure he can get you set up with anything you need.
 

duramax on fire

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Awesome thanks. Josh h shop is about 30 minutes from me.

I thought it would be the coolant being mixed in the water causing the oil film to brake down in the cylinder

Broke ring makes since also. But the truck was running great. Never would have guessed
 

Awenta

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Sep 28, 2014
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That's not wash down. A credit card is probably around 030 so an 060 bore should clean it up. But that will far surpass the cost of swapping a block. Assuming they are that deep. Looks like there may be a piece of something in the second picture.

I'd put it back together and see how fast I can window the block haha

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duramax on fire

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Ya now that you mention it the pic does look like something in the bottom. There is some areas around the top of the piston that looks like some damage. Like detonation
 

Ne-max

I like turtles
Nov 15, 2011
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I found a complete short block for 500 with good looking piston walls. I guess I'll have to go that route. Go ahead and hone, re ring and put new bearings in.

Is there any forum members doing machine work any where around dallas
Also check crank journals. They are just as important
 

duramax on fire

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Well need the truck and had to put it back to together. I'm going to try and get 6 months out of it. Looking for a short block to build.

The bad cylinder had 390lbs with Motor luke warm
And good cylinder had 410lbs compression
 

Awenta

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Did you pull that piston and check the rings?

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IOWA LLY

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Feb 23, 2007
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I ran into a similar situation 4 or 5 years ago on an LB7. It was actually worse then this. The owner had an injector stick open and one point on a road trip, and since then had severely overheated it due to blown head gaskets.

He wouldn't let me repair it. So against my better judgment I put everything back together and put the damage I had found, and "repair declined" on the ticket.

To my surprise the truck started and ran fine, even in the cold. Doesn't use oil. And as far as I know is still running today. I couldn't believe it survived the test drive honestly. Sometimes things like this will blow your mind how long it lasts.

I wouldn't count on it however.......
 

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