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Piston slap...2013 GM 3500

Old 08-17-2018, 05:36 PM
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Default Piston slap...2013 GM 3500

Has anybody had any experience with it? Dealer wants to replace pistons....not sure I want to go that route!

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08-18-2018, 04:01 AM
coddock
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Originally Posted by Manoverboard123 View Post
Believe it or not, I'll never understand a 1 ton+ truck with a gas motor in it.. You buy the truck for towing heavy, but you don't buy the heavy duty drivetrain to go with it. I somewhat understand gasser 3/4's, but a one ton gas is ridiculous.

I've said it before on here.. Buying a 1 ton truck with a whimpy ass gas motor is like buying a big ass offshore boat but saying, **** it, whip out the oars....

No offense to the OP. I've driven those one ton gasser, matter in fact I did TODAY! 3500 GM with the 6.0. All that truck did is remind me why I got the Duramax powered rig.....
i respectfully disagree...
First off, I don’t tow heavy, or enough for that matter to justify diesel.
Secondly...why would I want to spend 8-10 K more on a truck that I dont need, that also requires more maintenance, can be a headache in the winter, cost more for fuel, etc.?

Im a building contractor...I use this truck as a dumpster on wheels, a plow truck in the winter, and very occasionally to tow a bobcat. It plows snow like a beast, tows the cat just fine, doesn’t require def juice, 16 qt oil changes, constant filter maintenance, 110 volts in the winter, more expensive/ harder to find fuel, etc.?
All my trucks have been gas, GM trucks since 1988 when I started in business...I have.never had any issues with gas motors!

Its like putting a 454 hi perf motor in my downeast boat!

Now can we stick to my question...opinions on replacing pistons due to “piston slap”


Old 08-17-2018, 05:41 PM
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A 3500 gasser?
Really?
Old 08-17-2018, 05:49 PM
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Which motor?

Does it make the slapping noise only when cold for a few minutes?
Old 08-17-2018, 05:57 PM
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Thicker oil?
Old 08-17-2018, 06:01 PM
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Originally Posted by BillTex View Post
A 3500 gasser?
Really?
believe it or not some people do buy a truck without it being a diesel.....
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Old 08-17-2018, 08:47 PM
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Originally Posted by GradyGravelyFord View Post


believe it or not some people do buy a truck without it being a diesel.....
Believe it or not, I'll never understand a 1 ton+ truck with a gas motor in it.. You buy the truck for towing heavy, but you don't buy the heavy duty drivetrain to go with it. I somewhat understand gasser 3/4's, but a one ton gas is ridiculous.

I've said it before on here.. Buying a 1 ton truck with a whimpy ass gas motor is like buying a big ass offshore boat but saying, **** it, whip out the oars....

No offense to the OP. I've driven those one ton gasser, matter in fact I did TODAY! 3500 GM with the 6.0. All that truck did is remind me why I got the Duramax powered rig.....
Old 08-18-2018, 04:01 AM
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Originally Posted by Manoverboard123 View Post
Believe it or not, I'll never understand a 1 ton+ truck with a gas motor in it.. You buy the truck for towing heavy, but you don't buy the heavy duty drivetrain to go with it. I somewhat understand gasser 3/4's, but a one ton gas is ridiculous.

I've said it before on here.. Buying a 1 ton truck with a whimpy ass gas motor is like buying a big ass offshore boat but saying, **** it, whip out the oars....

No offense to the OP. I've driven those one ton gasser, matter in fact I did TODAY! 3500 GM with the 6.0. All that truck did is remind me why I got the Duramax powered rig.....
i respectfully disagree...
First off, I don’t tow heavy, or enough for that matter to justify diesel.
Secondly...why would I want to spend 8-10 K more on a truck that I dont need, that also requires more maintenance, can be a headache in the winter, cost more for fuel, etc.?

Im a building contractor...I use this truck as a dumpster on wheels, a plow truck in the winter, and very occasionally to tow a bobcat. It plows snow like a beast, tows the cat just fine, doesn’t require def juice, 16 qt oil changes, constant filter maintenance, 110 volts in the winter, more expensive/ harder to find fuel, etc.?
All my trucks have been gas, GM trucks since 1988 when I started in business...I have.never had any issues with gas motors!

Its like putting a 454 hi perf motor in my downeast boat!

Now can we stick to my question...opinions on replacing pistons due to “piston slap”



Last edited by coddock; 08-18-2018 at 04:12 AM.
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Old 08-18-2018, 04:06 AM
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Yes...6.0 motor....noise when cold start. It’s a bit worse when it’s cold out, but also when the temp is warm and the truck is started in the AM. It been doing this for quite a while. I’m just not sure about changing pistons and nothing else!
Old 08-18-2018, 04:14 AM
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Jeeeez I own a 4500 series truck with a gas motor. I must be an idiot.

Does then truck burn any oil? Smoking on start up? I just don’t see how if the pistons are messed up the cylinder walls would be fine?
Old 08-18-2018, 04:22 AM
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It needs to get broken down and measured with a micrometer. If it's piston wear alone then just pistons if not then bore oversize and matching pistons.
Old 08-18-2018, 04:47 AM
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Gm has had piston slap issues since the 1999's. Is it a only at cold start uP and goes away in a few minutes? Mine has been doing that for the last 60,000 miles. If it is constant the you need a engine rebuild.
Old 08-18-2018, 04:57 AM
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My issue is just that....how can new pistons alone solve this issue? From what I unde4stand, they use the same rings to eliminate the need for honing!

I was told the jugs were measured/ checked for roundness etc. and are within tolerance. Personally, I think I’m getting a line of shit!

no oil burn whatsoever...runs great, noise just on initial start up!
Old 08-18-2018, 04:57 AM
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If under warranty let them have a blast . On your dime , run it till it blows . Once failure occurs (if ), make a decision ,new reman or toss it ?
Old 08-18-2018, 05:11 AM
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The LS style motors all have it at crank up. The oil type makes a HUGE difference as well because I tried running Penzoil in my Trans Am one time and it did not like it. Switched back to Valvoline Synthetic that has the added zinc and the slap went away. What oil are you using currently?
Old 08-18-2018, 05:21 AM
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I was aware that the 8.1L motors had piston slap but not the small-block LS motors.
Old 08-18-2018, 05:23 AM
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Lol, I find the guy who can't believe it's a gas comment amusing.

I run a landscape business and we have several Chevy box trucks with the 6.0.
We also run 3 gas 3/4 ton trucks.

One of our 3/4 tons is an 06 we bought new, has 170k miles and for years had a 10k bobcat behind it.

We live in a very flat area so no grades to pull up (except a high rise bridge).

When we were buying we looked at diesel. For the box trucks we are very low yearly mileage, one truck is 10 years old and only has 43k miles....

When we ran the numbers we needed to drive at least 30k/ year for a diesel to break even.

Our f550 dump truck is diesel, and after a few $1,300. EGR coolers, turbo, etc.... I wish it was gas too.
Old 08-18-2018, 05:23 AM
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Originally Posted by coddock View Post
My issue is just that....how can new pistons alone solve this issue? From what I unde4stand, they use the same rings to eliminate the need for honing!

I was told the jugs were measured/ checked for roundness etc. and are within tolerance. Personally, I think I’m getting a line of shit!

no oil burn whatsoever...runs great, noise just on initial start up!
I haven't swung a wrench professionally in 30 years but new pistons get new rings! They are designed to break in. Ball honing can and always was done before assembly.
Old 08-18-2018, 05:24 AM
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Any of the pistons have broken skirts?
Old 08-18-2018, 05:24 AM
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Forgot muninput for the op

Continue to run it... Piston slap is common.
When it dies buy a crate motor and stick in it.
Old 08-18-2018, 05:40 AM
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Yes this is pretty common on cold start like mentioned. I will ask some of my techs on monday. I am truly not sure it will ever go away, but its been a long time since we have had any issues. The good news is they are very dependable engines if maintained with or without the piston slap.

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