1999 Dodge Ram bent valve

Tiny
JARED_0515
  • MEMBER
  • 1999 DODGE RAM
  • V8
  • 2WD
  • AUTOMATIC
  • 173,000 MILES
I have a bent exhaust valve and before I replace it I would like to know what could have caused it. The timing chain didnt break.I've had problems with the cooling system in the past but its all fixed now. But in the months before the valve bent it did run hot alot. I was gonna just replace the bent one but I would like to find out the cause before putting it back together. Thanks for any advice.
Saturday, January 12th, 2008 AT 9:22 PM

7 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Hi there,

To bend a valve, there must be some form of physical interference, They just don't bend on the own, Is the dead off yet? Check the inlet valve for seal damage and for any sign of something bouncing around on the piston crown.

Mark (mhpautos)
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Saturday, January 12th, 2008 AT 9:34 PM
Tiny
JARED_0515
  • MEMBER
  • 5 POSTS
Thanks for your response.I have the head off and the valve out. There is dings on the piston where the valve hit it. Im jus wondering if the engine running hot could have caused the failure. Im not where I can inspect it more right now.I just want to make sure I have the problem solved before I put it back togrther again.
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Saturday, January 12th, 2008 AT 10:01 PM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Hi there,

The only other thing that comes to mind is valve bounce, This can happen with over revving, or a weak or broken valve spring. This is a localised problem, one valve striking the piston. So something has caused the valve to stay open longer, Check the valve lift with a dial indicator, compare with another exhaust valve, check spring pressures, there will be something amiss there.

Mark (mhpautos)
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Saturday, January 12th, 2008 AT 10:20 PM
Tiny
JARED_0515
  • MEMBER
  • 5 POSTS
Thanks mhp! That is a lot of help.I figured it was something along those lines being only one bent. That helped me narrow it down a lot.I appreciate your time and help. I will try what you suggested and I may be back. One other question: is it wise to replace just the bent one if say for instance I have to change a weak spring?
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Saturday, January 12th, 2008 AT 10:36 PM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Hi there,

If you find a spring problem I would be replacing them all. Have the heads pressure tested that will prove the sealing ability of the other valves, repair as required.

Mark (mhpautos)
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Saturday, January 12th, 2008 AT 11:01 PM
Tiny
JARED_0515
  • MEMBER
  • 5 POSTS
Hello and thanks again mhp! Your advice and knowledge has helped me out tremendously on getting to the bottom of my problem. U have narrowed it down for me and put me on the right path. I have very little mechanic experience and needed the help. Your quick responses and knowledge have inspired me to join a carpentry forum where I can help others. I just gotta find one. Thanks again and I will be back
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Sunday, January 13th, 2008 AT 12:19 AM
Tiny
JARED_0515
  • MEMBER
  • 5 POSTS
Mhp, I tried to give u some points and comment but I only had like 0.2 points and it wouldn't accept it. Sorry about that. I tried. U deserve like 100 for the time you've saved me. Thanks again! Jared
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Sunday, January 13th, 2008 AT 12:31 AM

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