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Old 07-11-2014, 11:26 AM
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Piston hit spark plugs?

So yesterday, I entered the highway and stepped on it. I didn't hear anything out of the ordinary but when I hit a slight incline the engine was missing. I pulled over and heard a nasty pinging tapping sound at idle. I limped it home shut it down and started it back up...the noise was gone but it was still running rough. It coded a cyl 7 misfire. When I pulled the plugs on cyl 7 the side electrode was smashed down on the center electrode. I ended up replacing all the plugs because it was due.

Anyone ever see this or know what caused it? I figure if the piston hit them they would shatter and/or I would have more issues right now. It is running fine today.

It's a 2005 with the 5.7.
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Old 07-11-2014, 02:18 PM
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If a piston hit it, your motor blew up. I think it's fine.
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Old 07-11-2014, 02:43 PM
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Re: Piston hit spark plugs?

Things don't just run around in the combustion chambers, bashinig the spark plugs, at least not without cause some real bad things to happen . Since your's is an 05, my guess is that a valve seat (fairly common with early Hemi's) separated from the head and pieces of the seat, the valve head and/or the piston smashed the spark plug. Other problems with early Hemi's are the top ring land of the piston (it's too close to the top of the piston) came apart, but that's not as likely, unless you've done some big mods. and maybe run a 100-150 shot of N20 in it a bunch of times. Good luck though. At a minimum, if the cylinder wall is not toast, you'll be needing a cylinder head, and probably a piston. You won't know the full extent of the damage until it is torn down, but since you drove it some distance after the problem appeared, I would think worst case scenario. If you keep driving it, you could end up destroying the whole engine, bent rod and all.
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Old 07-11-2014, 02:46 PM
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Re: Piston hit spark plugs?

Was there any mark of impact on the plug? The piston can not hit the plug, or you must have installed too long plugs, which can not be the case here.
If something impacted on the plug, you should have some mark. In that case you should find out what it could have been. If you could get your hands on a boroscope, you could inspect the cylinder walls for scratches or other impact damage, the piston and the valves as well for impact or missing pieces.
On the 4.7 the valve seats can drop, causing all kind of internal damage. Donīt know if the 5.7 has issues like that.
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Old 07-11-2014, 02:49 PM
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Re: Piston hit spark plugs?

Quote:
Originally Posted by jeepgcoman View Post
Things don't just run around in the combustion chambers, bashinig the spark plugs, at least not without cause some real bad things to happen . Since your's is an 05, my guess is that a valve seat (fairly common with early Hemi's) separated from the head and pieces of the seat, the valve head and/or the piston smashed the spark plug. Other problems with early Hemi's are the top ring land of the piston (it's too close to the top of the piston) came apart, but that's not as likely, unless you've done some big mods. and maybe run a 100-150 shot of N20 in it a bunch of times. Good luck though. At a minimum, if the cylinder wall is not toast, you'll be needing a cylinder head, and probably a piston. You won't know the full extent of the damage until it is torn down, but since you drove it some distance after the problem appeared, I would think worst case scenario. If you keep driving it, you could end up destroying the whole engine, bent rod and all.
Yeah... the good news is that possibly the offending bits have been hammered down a tad, or there would be a lot more noise. I wouldn't wait for long or drive it before a tear down, and if nothing on top, go underneath and see if a piston pin is loose enough to allow it to slap the plug.
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Old 07-16-2014, 12:13 PM
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Got low compression in the cylinder, time to say bye I think....
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Old 07-16-2014, 02:36 PM
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Re: Piston hit spark plugs?

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Originally Posted by afhanson72 View Post
Got low compression in the cylinder, time to say bye I think....
... or pick up a 6.4 and see if it will fit.
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Old 07-16-2014, 02:45 PM
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Re: Piston hit spark plugs?

Haha! That would be sweet!
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