Gen 3 Irregular Wear on Valve Stem and Rocker

Mamba_153 · 2024-11-20T13:33:02-0500

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 · 2024-11-20T13:55:01-0500

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

Mamba_153 · 2024-11-20T14:27:05-0500

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 · 2024-11-20T14:57:53-0500

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

daveg · 2024-11-20T17:33:20-0500

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 · 2024-11-21T08:41:38-0500

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 · 2024-11-21T08:43:16-0500

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.

Gen 3 Irregular Wear on Valve Stem and Rocker

Mamba_153

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