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Old 06-15-2019, 09:20 PM   #1 (permalink)
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Default Scratched Cam lobe

Hey everyone, thanks again for all the information you all have been able to provide me on this car!

I installed the 3sx lifters this weekend, unfortunately one of them wasn't seated right when I ran the motor.. When I popped the front valve cover I found it, and now the cam lobe has an appreciable scratch on it . Deep enough to dig your fingernail into.



I guess my question is, is there harm in leaving the cam scratched like that? Should I leave it alone or am I looking at putting in a new one now?
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Old 06-15-2019, 09:23 PM   #2 (permalink)
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Default Re: Scratched Cam lobe

As long as its not proud on top of the surface the roller rockers will go right over it. It wouldn't hurt to go over the scratch with 400 and then 1000 grit, being careful to keep grit out of the engine. Don't try to polish out the scratch, just any high spots.
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Old 06-16-2019, 05:23 AM   #3 (permalink)
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Default Re: Scratched Cam lobe

Quote:
Originally Posted by Chris @ Rvenge Performance View Post
As long as its not proud on top of the surface the roller rockers will go right over it. It wouldn't hurt to go over the scratch with 400 and then 1000 grit, being careful to keep grit out of the engine. Don't try to polish out the scratch, just any high spots.
I agree w this.
Should be ok, the width of the lobe is more than enough to make up for it. Just make sure there isn't any burrs.

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Old 06-16-2019, 11:29 AM   #4 (permalink)
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Default Re: Scratched Cam lobe

Make sure there aren’t any high spots, the low spot won’t be an issue.
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Old 06-16-2019, 02:36 PM   #5 (permalink)
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Default Re: Scratched Cam lobe

Thanks for the input. I feel a lot better about this now. Engine still sounds a little loud but I might have a lifter or two that haven't shut up yet
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Old 06-17-2019, 09:37 PM   #6 (permalink)
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Default Re: Scratched Cam lobe

Thought I'd re-open this post in search of a little more information...

After this install of the 3sx lifters and driving the car, all of the lifters have quieted down except for one. I'm still getting a tapping noise from the front valve cover. Almost sounds like helicopter blades if I put my ear against the front valve cover.

Could this be related to these new lifters?? I don't remember the car doing this before I installed these

Pulled the front valve cover tonight, all the lifters seemed to be pumped and hard. Still confused.

Last edited by therustyspoon6; 06-17-2019 at 09:52 PM.
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Old 06-18-2019, 07:29 AM   #7 (permalink)
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Default Re: Scratched Cam lobe

its still possible that one may have trapped air if you did not pump them when they where in presoak
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Old 06-18-2019, 08:28 AM   #8 (permalink)
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Default Re: Scratched Cam lobe

You can idle the car with the front valve cover off if you are having trouble finding the exact source of the noise.
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Old 06-18-2019, 02:58 PM   #9 (permalink)
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Default Re: Scratched Cam lobe

Quote:
Originally Posted by gawdzinner View Post
You can idle the car with the front valve cover off if you are having trouble finding the exact source of the noise.
Thought about doing that for a hot sec but didn't want to risk getting oil splashed on my timing belt - I'll try it and report back

Last edited by therustyspoon6; 06-18-2019 at 03:16 PM.
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Old 07-03-2019, 12:53 AM   #10 (permalink)
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Default Re: Scratched Cam lobe

Still haven't been able to find the source of this tapping noise.
I took all the front lifters out and re-primed them, put them back in. They all quieted down but I can still hear this noise.

It's loudest if I put my ear against the front timing cover. I took the timing covers off and the belt looks nice and tight still. Any thoughts where to check next?

Thanks in advance
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