Need advice - 1 piston slightly damaged

[addicted2avants]

Edited

[CrickiKaze]

That ring land must have been bad from the get go, that thing needs to be pulled and I think the only thing that saved it so far is the rings. I see no indication of the valve contacting the piston.

Just need a new (or used) piston, hone the cylinder and get new rings. Check the bushing on the rod piston end and new rod bolts...there's something I'm forgetting....

[oasis]

What does the head look like?

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[Atomic Avant]

Any damage to the head?

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[addicted2avants]

bd

[oasis]

Some kind of hard foreign object/debris..

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[Atomic Avant]

Some kind of hard foreign object/debris..

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Looks like it might have been a part of a spark plug or hardware.

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[Rol-co]

Maybe broken valve stem end? you can see if you take the valves out.

[addicted2avants]

db

[Atomic Avant]

I guess I'm lucky it didn't do any more damage. Since I'm this deep into the engine my plan is to get another (used) piston, new rings and con rod bearings for all 8 cylinders and re-hone all 8. That way I'm good to go for a while. Thanks for the advice!

Might as well build and boost!

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[addicted2avants]

bd

[Rol-co]

Yeah maybe. I'll be doing the valve stem seals in the next few days and will inspect the valves in that cylinder.

What triggered you to do the stem seals? If i look at the piston there is no excessive oil consumption?

[addicted2avants]

bd

[AlexB6S4]

I would replace the piston as it may come further apart. The lower compression is most likely from a valve or two in that chamber leaking at the seat since there is high probability of a valve closing on whatever the object was and trapping it on the seat leaving a indent. We have a great rebuild program if you need help.


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[addicted2avants]

bd

[AlexB6S4]

Thanks Alex. I was just looking into your head rebuild program and might go that route. Will be buying the rings and a few other things from you too if I decide to dive in and do the bottom end refresh.

Spunds good. I have like 100+ used stock pistons in a bin that we can match a weight and OD on if you need.