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Old November 8th, 2009, 06:23 PM   #1
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Default Chevy 6.0 piston slap

Does anyone know of any way to quite down piston slap on a 2002 chevy 6.0
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Old November 8th, 2009, 07:17 PM   #2
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rebuild the engine with a tighter tolerance. otherwise no. it won't harm anything. LS engines run for a very long time and all the 99-02 engines have that common problem and i've seen some 99's with over 250,000 miles already with original engine intact.
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Old November 8th, 2009, 08:25 PM   #3
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My 01 LS series engine has piston slap. It has 260,000 miles on it (original motor). I wouldn't worry about it.
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Old November 8th, 2009, 08:29 PM   #4
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just drive it
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Old November 8th, 2009, 09:33 PM   #5
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My 99 And 2002 Had The Same Prob Chevy Told Me The Reason For That Is They Shortened The Bottom Of The Piston Head So It Tends To Bounce Back And Forth. I Never Had Any Issues With Eather Motor So I Would Worry About It Drive It Like U Stole It!
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Old November 8th, 2009, 10:34 PM   #6
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I know it is a common problem on 6.0's when they are cold but after the motor warms up you should not hear it. If you do still hear it after it warms up I would try a different grade oil. If it calls for a 5w30 try a 5w40, redline and rotella both make a great 5-40, don't change the first number in the oil because that is your cold flow properties, a 10w40 is a lot thicker at startup than a 5w30 however once at operating temp they are both a 30 weight.
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Old November 9th, 2009, 06:15 AM   #7
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I know it is a common problem on 6.0's when they are cold but after the motor warms up you should not hear it. If you do still hear it after it warms up I would try a different grade oil. If it calls for a 5w30 try a 5w40, redline and rotella both make a great 5-40, don't change the first number in the oil because that is your cold flow properties, a 10w40 is a lot thicker at startup than a 5w30 however once at operating temp they are both a 30 weight.
I don't think a thicker oil is going to help with the pistons rocking in the bores.
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Old November 9th, 2009, 06:22 AM   #8
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I don't think a thicker oil is going to help with the pistons rocking in the bores.
x2, but if I remember right they did have an issue with some cheap oil filters that would let all the oil run back to the pan and cause noise on start up, where the ac delco filter had a valve or something to keep it from doing so, I think???
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Old November 9th, 2009, 07:30 AM   #9
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Oil draining back and thin oil causing noises on startup is more about sloppy bearings and collapsed lifters, I think.

Piston slap comes from the piston rocking in the bore from the forces that come from the connection rod acting about the wrist pin. IIRC, they solved the problem in newer engines with a slightly offset pin position in the pistons.
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Old November 9th, 2009, 07:32 AM   #10
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yea, GM made the piston too small trying to save weight for better fuel milage. or at least thats what i was told.
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Old November 9th, 2009, 07:33 AM   #11
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x2, but if I remember right they did have an issue with some cheap oil filters that would let all the oil run back to the pan and cause noise on start up, where the ac delco filter had a valve or something to keep it from doing so, I think???
and that sounds like FRAM the anti drain back seal is paper, and deteriorates after a thousand miles..... or so i was told
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Old November 9th, 2009, 08:13 AM   #12
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yea, GM made the piston too small trying to save weight for better fuel milage. or at least thats what i was told.
It was to reduce friction - since then, I believe the skirts are a bit longer and a anti-friction coating has been applied.
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Old November 9th, 2009, 09:30 AM   #13
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Hey well thanks guys i appreciate it.. everyone told me it wasnt a big deal but just wanted to make sure.. its kinda annoying
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Old November 10th, 2009, 05:31 AM   #14
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Quote:
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I don't think a thicker oil is going to help with the pistons rocking in the bores.
It will not help with the pistons rocking but it will help quiet it down.
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Old November 10th, 2009, 04:37 PM   #15
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It will not help with the pistons rocking but it will help quiet it down.
alrighty i appreciate it
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