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Old 01-07-2004, 11:04 PM   #1
Allcoupedup
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Default Cam bearing surface scuff - OK?

This small scuff was apparently caused by the cam moving around in a dirty box. It's a FM CS1145R LT1 clone camshaft and was in a nice looking and undamaged box. The inside was a little dirty (gritty) and I found this small scuff on the rear most bearing surface. I can't believe the cam wasn't in a plastic bag or wrapped in paper.

Is this usable?
click to enlarge
Click the image to open in full size.

thanks,
brian
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Old 01-07-2004, 11:16 PM   #2
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Default Re: Cam bearing surface scuff - OK? (Allcoupedup)

Why take a chance? Take it to the local machine shop and they can polish that journal; and it should be a very cheap fix!
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Old 01-08-2004, 09:33 AM   #3
MasterDave
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Default Re: Cam bearing surface scuff - OK? (Allcoupedup)

IMO the cam is fine if that's all you can see. Install it and forget it. :steering:
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Old 01-08-2004, 09:45 AM   #4
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Default Re: Cam bearing surface scuff - OK? (MasterDave)

a little steel wool might be able to clean that up...
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Old 01-08-2004, 10:39 AM   #5
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Default Re: Cam bearing surface scuff - OK? (Allcoupedup)

Allcoupedup,

Hey, I had the same question. Why the poor packaging. Mine was shipped in that box, heavily taped on the outside, rattling around, from Indiana to my house in Michigan. WTF!!! Fotunately, my son miked the 5 bearing surfaces and surprisingly they all were true (posted those specs on a previous post).

Well, I've got the material....now I've got to find the labor HA! :jester

Trying to get heat in my garage b/4 I start my hydraulic to solid swap.

Jim
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Old 01-08-2004, 11:14 AM   #6
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Default Re: Cam bearing surface scuff - OK? (MasterDave)

Quote:
IMO the cam is fine if that's all you can see. Install it and forget it. :steering:
:iagree: :yesnod:
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Old 01-08-2004, 12:13 PM   #7
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Default Re: Cam bearing surface scuff - OK? (Allcoupedup)

RUN IT!! :steering:
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Old 01-08-2004, 12:40 PM   #8
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Default Re: Cam bearing surface scuff - OK? (Allcoupedup)

Thanks for the input guys. I have NO experience with internal engine work and matters of this nature. If I can find a day where I have time, its not raining or snowing, AND its above 25 degrees I'll get to work!
brian
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Old 01-08-2004, 01:47 PM   #9
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Default Re: Cam bearing surface scuff - OK? (Allcoupedup)

Good luck with the install, while that's another subject alltogether, I would suggest you find somebody with enough experience(or a good tech article) to walk you through the process of "indexing" the cam to be sure you're getting the most out of it for your application. I think it'd be well worth your time interms of the potential power gains. Also be sure to use plenty of lube& get good break-in instructions. :flag
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Old 01-08-2004, 03:17 PM   #10
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Default Re: Cam bearing surface scuff - OK? (mid-year crisis)

Lightly polish the defect with some 600 paper wetted with mineral spirits until you knock down any high spots where the metal is upset and above the journal surface.

Duke
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Old 01-08-2004, 04:49 PM   #11
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Default Re: Cam bearing surface scuff - OK? (SWCDuke)

Duke,
What's the purpose of the minerial spirits?
Brian
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Old 01-08-2004, 10:00 PM   #12
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Default Re: Cam bearing surface scuff - OK? (Allcoupedup)

Wet sanding is less aggressive than dry sanding and the paper goes farther.

I always use mineral spirits and 220-600 paper for shaving valve and bearing shims and washers because it provides some lubrication and won't corrode unfinished steel.

For shims or washers that don't have much relative motion I'll use paper on the coarse end so the job goes faster, but for a bearing journals I always use fine paper.

Duke
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Old 01-08-2004, 10:00 PM
 
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