Can anyone diagnose what happened to this engine? Pic included

[5.0 Hatch]

01 cobra engine with right at 200k miles. No knocking or ticking. Exhaust port on number 8 cylinder very oily and the cylinder bore itself has a gold tint to it. The rest of the cylinders and ports look normal. Valve seal or guide issue?

 

[MG0h3]

23yrs old and 200k, everything is going to be worn.

Could be a combo of guides, stem seals, and rings.

Leak down would be the easiest way to diagnose but I wouldn’t do anything less than a full rebuild.

Might be nice to see what failed the most I suppose to give you an area to inspect on the heads.


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[5.0 Hatch]

23yrs old and 200k, everything is going to be worn.

Could be a combo of guides, stem seals, and rings.

Leak down would be the easiest way to diagnose but I wouldn’t do anything less than a full rebuild.

Might be nice to see what failed the most I suppose to give you an area to inspect on the heads.


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I appreciate it. I already replaced the entire engine with an aviator engine so I'm back running but was simply curious of what was the possible failure. I feel like it might be head related since 7 out of the 8 cylinders looked great.

 

[SGT MERC]

Did it smoke out the tail pipe at all? If so... At start up, while driving or both? What did the top of the piston, combustion chamber and valves look like?

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[Black Gold 380R]

23yrs old and 200k, everything is going to be worn.

Could be a combo of guides, stem seals, and rings.

Yep, based on that picture and description of the other 7 my guess would be valve guides/seal allowing oil in there.

 

[MG0h3]

Typically oil smoke out the exhaust under decel will be guided or stems.

Rings/bore under load.

None are really absolute.

Leak down is the best bet here.

Rethinking. Since this is only one cylinder, I’d lean more towards a broken ring.

Typically stem seals and guides fail together over time.


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