Gen 3 Irregular Wear on Valve Stem and Rocker

Mamba_153 · Wednesday at 1:33 PM

Gen 3 2005 Mamba. Plug wires shorted to exhaust manifold. Heard tapping noise on #10 cylinder valves. I see irregular wear on the valve stem and the rocker. See pictures.

Is this a bent valve? Damaged valve guide? Or other issue? Thanks I appreciate your responses.

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Old School · Wednesday at 1:55 PM

My first thought would be either the rocker arm or rock arm pedestal, not being square.

Mamba_153 · Wednesday at 2:27 PM

Old School said:
My first thought would be either the rocker arm or rock arm pedestal, not being square.

I'll check it out. The rocker looks like it has been wearing like that since it was built? Very uneven and paint is still on the rocker. The end of the valve stem looks rough / wear.

99RT10GTS · Wednesday at 2:57 PM

How do the others along the same bank look? Pics?

daveg · Wednesday at 5:33 PM

Ya, I agree, something looks out of square to me. Rocker / pedestal as mentioned. I would replace both. The Valve looks like it may need to be replaced or it could take out the new Rocker. Make sure the guide looks good as well as the steam not being bent at the top.

Mamba_153 · Thursday at 8:41 AM

99RT10GTS said:
How do the others along the same bank look? Pics?

They look perfect, no odd wear a pattern. #10 is the only one that has wear and makes the tapping noise.

Mamba_153 · Thursday at 8:43 AM

daveg said:
Ya, I agree, something looks out of square to me. Rocker / pedestal as mentioned. I would replace both. The Valve looks like it may need to be replaced or it could take out the new Rocker. Make sure the guide looks good as well as the steam not being bent at the top.

Thanks. I'll take the head off and check. I'll replace the value and rocker, check the pedestal.

MoparMap · Thursday at 3:38 PM

Have you done any work on the heads? It almost looks like there are helicoils in the mounting holes on the head. Did the factory do that? I'm kind of wondering if one of them isn't all the way flush with the surface so when you tighten it down it's not going flat.

Gen 3 Irregular Wear on Valve Stem and Rocker

Mamba_153

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99RT10GTS

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