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5.3 LS 300k Busted Piston #4473141
07/28/17 02:18 PM
07/28/17 02:18 PM
Joined: Dec 2006
Posts: 627
Lynchburg, Va
JasonC Offline OP
JasonC  Offline OP
Joined: Dec 2006
Posts: 627
Lynchburg, Va
Here is a pic from a 2003 Silverado 5.3 with 300k. It broke a valve which caused it to punch a hole in the Piston and trashed the combustion chamber. This truck was bought in 2006 with only 40k and it has always used M1 5w30. I'm impressed with how clean the tops of the pistons are. The rest if the bottom end was just as clean. We believe that a clogged cat is what caused the pressure buildup and broke the valve.


Last edited by JasonC; 07/28/17 02:20 PM.

2012 Buick Verano 2.4
2006 Ford Mustang GT Convertible
Re: 5.3 LS 300k Busted Piston [Re: JasonC] #4473144
07/28/17 02:25 PM
07/28/17 02:25 PM
Joined: Nov 2008
Posts: 3,272
Oshawa, Ontario Canada
JC1 Offline
JC1  Offline
Joined: Nov 2008
Posts: 3,272
Oshawa, Ontario Canada
Your pic is on photobucket. They are blocking links to other websites.


2015 Grand Caravan SXT Plus 5w-20 PPPP/Fram Ultra Filter
1997 Honda Civic CX 5w-30 Shell Conventional/Fram Ultra Filter
Re: 5.3 LS 300k Busted Piston [Re: JasonC] #4473145
07/28/17 02:26 PM
07/28/17 02:26 PM
Joined: Jan 2011
Posts: 3,240
PV Az
AZjeff Offline
AZjeff  Offline
Joined: Jan 2011
Posts: 3,240
PV Az
never mind

Last edited by AZjeff; 07/28/17 02:27 PM.

86 Samurai 1.3 leftovers
14 RAV4 2.5 5W-20 PP
16 Silverado 1500 4.3, DI, AFM 5W-30 PP

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Re: 5.3 LS 300k Busted Piston [Re: JasonC] #4473150
07/28/17 02:30 PM
07/28/17 02:30 PM
Joined: Dec 2016
Posts: 7,109
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 7,109
Waco, TX
Originally Posted By: JasonC
We believe that a clogged cat is what caused the pressure buildup and broke the valve.


????

I kind of doubt that. I've floated many exhaust valves due to excessively high back-pressure on turbocharged race engines, and never had a failure like THAT! ("Float" is really only about .010"-.020" off the seat, any way)

clogged converter = engine has no power or quits, not broken valves.

This was a metallurgical flaw.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: 5.3 LS 300k Busted Piston [Re: JasonC] #4473172
07/28/17 03:09 PM
07/28/17 03:09 PM
Joined: Aug 2011
Posts: 9,560
Boston, MA
HerrStig Offline
HerrStig  Offline
Joined: Aug 2011
Posts: 9,560
Boston, MA
So check the cat. I doubt it's the cause, though, more like a bad valve.

Re: 5.3 LS 300k Busted Piston [Re: JasonC] #4473207
07/28/17 04:01 PM
07/28/17 04:01 PM
Joined: Jun 2003
Posts: 17,808
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,808
Deplorable in apple valley, ca
Valve guides got loose and let the valve bend when it seated and it eventully broke off.


02 Wrangler carlube 5w30
87 F250 traveler 15w40
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Z400 castrol T 10w40
Can am maveric edge 5w40
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Re: 5.3 LS 300k Busted Piston [Re: Chris142] #4473274
07/28/17 05:41 PM
07/28/17 05:41 PM
Joined: Dec 2006
Posts: 627
Lynchburg, Va
JasonC Offline OP
JasonC  Offline OP
Joined: Dec 2006
Posts: 627
Lynchburg, Va
Originally Posted By: Chris142
Valve guides got loose and let the valve bend when it seated and it eventully broke off.


Incorrect. There was nothing wrong with the guide or the valve spring. The converter was clogged.


2012 Buick Verano 2.4
2006 Ford Mustang GT Convertible
Re: 5.3 LS 300k Busted Piston [Re: Linctex] #4473276
07/28/17 05:42 PM
07/28/17 05:42 PM
Joined: Dec 2006
Posts: 627
Lynchburg, Va
JasonC Offline OP
JasonC  Offline OP
Joined: Dec 2006
Posts: 627
Lynchburg, Va
Originally Posted By: Linctex
Originally Posted By: JasonC
We believe that a clogged cat is what caused the pressure buildup and broke the valve.


????

I kind of doubt that. I've floated many exhaust valves due to excessively high back-pressure on turbocharged race engines, and never had a failure like THAT! ("Float" is really only about .010"-.020" off the seat, any way)

clogged converter = engine has no power or quits, not broken valves.

This was a metallurgical flaw.



The converter was clogged


2012 Buick Verano 2.4
2006 Ford Mustang GT Convertible
Re: 5.3 LS 300k Busted Piston [Re: JasonC] #4473277
07/28/17 05:43 PM
07/28/17 05:43 PM
Joined: Dec 2006
Posts: 627
Lynchburg, Va
JasonC Offline OP
JasonC  Offline OP
Joined: Dec 2006
Posts: 627
Lynchburg, Va


2012 Buick Verano 2.4
2006 Ford Mustang GT Convertible
Re: 5.3 LS 300k Busted Piston [Re: JasonC] #4473389
07/28/17 07:52 PM
07/28/17 07:52 PM
Joined: Jun 2009
Posts: 3,743
Chicago, IL
tomcat27 Offline
tomcat27  Offline
Joined: Jun 2009
Posts: 3,743
Chicago, IL
crazy! what are you gonna do with it?


2019 Cherokee, 2018 Jetta, 2014 Sentra, 1995 Escort, 1970 Cougar, 2013 XT250, 2010 Vstar, 2014 CTX1300
Re: 5.3 LS 300k Busted Piston [Re: JasonC] #4473407
07/28/17 08:13 PM
07/28/17 08:13 PM
Joined: Nov 2008
Posts: 9,273
Phoenix
dishdude Online content
dishdude  Online Content
Joined: Nov 2008
Posts: 9,273
Phoenix
Were you redlining it when that happened?


2018 Challenger SRT 392 PUP 0w-40 Wix 57899XP
2018 GTI
Re: 5.3 LS 300k Busted Piston [Re: JasonC] #4473636
07/29/17 05:07 AM
07/29/17 05:07 AM
Joined: Oct 2008
Posts: 19,192
Sunny Florida
SteveSRT8 Offline
SteveSRT8  Offline
Joined: Oct 2008
Posts: 19,192
Sunny Florida
300k with stock parts the valve guides were definitely worn. We have raised and killed dozens of 5.3's and they rarely break. We have had many clogged cats at high miles and yet zero engine failures, even when racing them at far past factory redline.

Sorry, but I don't see a clogged exhaust breaking a valve like that...


"In a democracy, dissent is an act of faith."
J. William Fulbright
Best ET-12.79 @ 111 mph
4340 pounds, Street tires
Just like we go to Publix
Re: 5.3 LS 300k Busted Piston [Re: JasonC] #4473957
07/29/17 01:42 PM
07/29/17 01:42 PM
Joined: May 2012
Posts: 5,655
Fort Lauderdale, FL
DoubleWasp Offline
DoubleWasp  Offline
Joined: May 2012
Posts: 5,655
Fort Lauderdale, FL
I dealt with a clogged cat on my Navigator. It was clogged so bad that I had to disable overdrive and floor the truck to get to 55 mph. Even that never broke a valve.

I suppose anything is possible, but I have much much doubt that a clogged cat was your issue.

I'm betting it was one of the other top causes of valve fracture.


07 Lincoln Navigator M1 0w-40/FU
68 Charger R/T / Supercharged 440 VR1/DBL7349
07 Ram 3500 4x4 / Cummins 6.7 /DBL7349
17 Maserati GranTurismo Cabrio
Re: 5.3 LS 300k Busted Piston [Re: tomcat27] #4475437
07/31/17 09:39 AM
07/31/17 09:39 AM
Joined: Dec 2006
Posts: 627
Lynchburg, Va
JasonC Offline OP
JasonC  Offline OP
Joined: Dec 2006
Posts: 627
Lynchburg, Va
Originally Posted By: tomcat27
crazy! what are you gonna do with it?
We put some JB Weld on the Piston and slapped it back together. Should be good for another 300k. J/K we have a crate motor going back in.


2012 Buick Verano 2.4
2006 Ford Mustang GT Convertible

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