LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

How to clean carbon from valves?

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Old Mar 24, 2009 | 08:19 PM
  #1  
Netwrkengeer's Avatar
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How to clean carbon from valves?

I recently over heated my LT1 and warped the heads.

I Just got them back from the machinist. Now that their flat, I'd like to clean up the valves and rods. They have a lot of carbon and it looks like they have burn marks.

Is there anything I can do to clean them up? I was thinking about using a degreaser and a power washer. Then maybe hit it with an aluminum pollish with a metal polishing pad on a dremal.

I'd like to do this to the intake manifold and block (piston head / walls) as well, since I have it off and exposed.

I dont have the cash after the milling and gasket sets to get a value job done but I'd like to at least clean it up.

Any ideas or warnings.
Old Mar 24, 2009 | 09:29 PM
  #2  
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I think you should leave them alone, it's very easy to damage the aluminum surface and the more you handle them, the more likely this is. Cleaning assembled parts like that is a bad idea as it removes the lube from the guides, etc.

The bores should be filled with paper towel and wire wheel the deck to clean it off - do not by any means use an abrasive pad to clean the decks of any metal.

Some pictures would be helpful to access condition, but really if there was something wrong that would cause you problems the machinist should have told you about it.
Old Mar 24, 2009 | 09:35 PM
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Thanks, I'll throw some pics up tomorrow afternoon.
Old Mar 25, 2009 | 08:44 PM
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Here are the images I promised, they are over 2mb each at 2592 x 1944 dim. so they should be big enough to get some detail.

Thanks for your help.

http://www.fullspeedcomputer.com/heads/IMG_4479.JPG
http://www.fullspeedcomputer.com/heads/IMG_4480.JPG
http://www.fullspeedcomputer.com/heads/IMG_4481.JPG
http://www.fullspeedcomputer.com/heads/IMG_4483.JPG
http://www.fullspeedcomputer.com/heads/IMG_4490.JPG
http://www.fullspeedcomputer.com/heads/IMG_4491.JPG
http://www.fullspeedcomputer.com/heads/IMG_4492.JPG
http://www.fullspeedcomputer.com/heads/IMG_4493.JPG
http://www.fullspeedcomputer.com/heads/IMG_4494.JPG
http://www.fullspeedcomputer.com/heads/IMG_4495.JPG
http://www.fullspeedcomputer.com/heads/IMG_4496.JPG
http://www.fullspeedcomputer.com/heads/IMG_4497.JPG
http://www.fullspeedcomputer.com/heads/IMG_4498.JPG
http://www.fullspeedcomputer.com/heads/IMG_4499.JPG
http://www.fullspeedcomputer.com/heads/IMG_4500.JPG
http://www.fullspeedcomputer.com/heads/IMG_4501.JPG
http://www.fullspeedcomputer.com/heads/IMG_4502.JPG
http://www.fullspeedcomputer.com/heads/IMG_4503.JPG
http://www.fullspeedcomputer.com/heads/IMG_4504.JPG
http://www.fullspeedcomputer.com/heads/IMG_4505.JPG
http://www.fullspeedcomputer.com/heads/IMG_4506.JPG
http://www.fullspeedcomputer.com/heads/IMG_4507.JPG
http://www.fullspeedcomputer.com/heads/IMG_4508.JPG
http://www.fullspeedcomputer.com/heads/IMG_4509.JPG
http://www.fullspeedcomputer.com/heads/IMG_4510.JPG
http://www.fullspeedcomputer.com/heads/IMG_4511.JPG
http://www.fullspeedcomputer.com/heads/IMG_4512.JPG
http://www.fullspeedcomputer.com/heads/IMG_4513.JPG
Old Mar 26, 2009 | 01:17 PM
  #5  
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So i don't plan to wire brush or grind anything, would it be ok to polish the ports and head? is it even worth the time?
Old Mar 26, 2009 | 02:03 PM
  #6  
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that engine looks nasty. gonna take alot of work to clean it up. looks like it had a rough life
Old Mar 26, 2009 | 08:29 PM
  #7  
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Wow - that motor is pretty abused, lots of cooked oil up there. Did they pressure test the heads, check the valve seal and spring pressure, when I ever see them that cooked a surface is just the least of what it needs.
Old Apr 6, 2010 | 07:56 AM
  #8  
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Wow, I think that engine looks beautiful. You should see what mine looks like
I have no idea where to even start.
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Old Apr 6, 2010 | 12:46 PM
  #9  
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ewwwwwwwwwwwwwwwwwwwwwwwwwwwww
Old Apr 6, 2010 | 09:09 PM
  #10  
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That needs to be rebuilt - that rust is too much.
Old Apr 7, 2010 | 03:22 AM
  #11  
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wow.... i've over heated my LT1 blew both gaskets, drivers side head, and the big coolant return tube. it had a little rust built up with the heads off but damn. and my engine had 280k+ miles and doesn't look near as bad under the hood.
Old Apr 7, 2010 | 08:21 PM
  #12  
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jesus christ that looks like LT1 diarrhea
Old Apr 9, 2010 | 07:16 PM
  #13  
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OP please post what kind of oil you use so that nobody else here can make the same mistake you did
Old Apr 9, 2010 | 07:37 PM
  #14  
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That's what happends when you dont change the oil on time ..Nasty
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