Is my piston good?

[george.e.perez.gov@gmail.]

The HMMWV stopped running and after pulling the heads thinking it was a headgasket. I noticed one of the pistons was a bit damaged, Looks like a glow plug had broken off into the cylinder.
And got mashed. Do you think it's worth resurfacing or new engine?

 

[spankybear]

What does the cylinder wall look like ?

 

[Mullaney]

The HMMWV stopped running and after pulling the heads thinking it was a headgasket. I noticed one of the pistons was a bit damaged, Looks like a glow plug had broken off into the cylinder.
And got mashed. Do you think it's worth resurfacing or new engine?

.
Yessir, looks like it ate a glowplug.

Like @spankybear said, roll the engine down (piston down) and see what your cylinder wall looks like. If that isn't terribly scarred, you might be okay...

.

 

[Retiredwarhorses]

You have come this far, just replace new piston….what’s the cylinder and head look like.

 

[george.e.perez.gov@gmail.]

What does the cylinder wall look like ?

Cylinder wall looks fine, the problem we thought was the head gasket, lots of coolant in the oil, but no oil in the coolant system, pressure tested the coolant system and it held pressure. Now I'm thinking it may have damage to the piston ring.

 

[Mogman]

As RWH said if the cylinder walls look good replace that piston, it has allot of damage around the edges of the piston, likely collapsing the ring lands.
That is not however your coolant problem, have that head looked at very closely also inspect all the cylinder walls for cracks especially the rear cylinder.

 

[spankybear]

Cylinder wall looks fine, the problem we thought was the head gasket, lots of coolant in the oil, but no oil in the coolant system, pressure tested the coolant system and it held pressure. Now I'm thinking it may have damage to the piston ring.

The rings will not let coolant in the oil in anyway if the head gasket is good. There could be a chance there's a crack in the cylinder and will need to check the cylinder wall very closely. Run the piston down and use your finger and fingernail to "feel" . A crack would let coolant into the oil. How does the head look?

I would make 100% sure there is no crack before I would go any further.