Cooked #1 Piston

[acme66]

Finally got around to pulling the tour truck motor down and found #1 was cooked with bits of skirt melted right to the liner. Clear that was where the water leak was coming from. Pitting seems to have eaten the o rings. Trying to decide how long it ran buggered and what came first burning the hole or failure of o rings. Welcome opinions.

For those following us on YouTube on NelsonStudios you should know the liner puller was a total failure. Oh well.

So... favorite suply houses for parts? Leaning towards just replacing #1 but since we also pulled #5 just as a base line I will need o rings for 5 too.

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[Tinstar]

It would help if you loaded the pics directly to Steel Soldiers site.
That link will go dead eventually and help no one.

 

[wrenchturner6238]

Looks like to me the pitting was almost a leak and might have been burning a little. Most of the time it is the extra heat from the piston melting to the liner that really cooks the o-rings good and coolant in the oil pan.

 

[simp5782]

If there is still a carquest in plains the liner, piston, and ring kit is 226-1747 thru them or

http://www.hdengineparts.com/Sleeve-Assembly-226-1747.htm

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[cbrTodd]

That looks a lot like liner cavitation to me. It's caused by incorrect coolant chemistry. Once it eats through into the cylinder from the coolant side, it leaks coolant into the cylinder and / or oil pan depending on where the piston is in relation to the leak. It also interferes with the liner cross hatch's ability to hold oil, leading to the piston scuff that you found.

If that's actually what it was, then there's a good chance that other cylinders could be in similar shape. I would definitely recommend pulling the other cylinders out to confirm before you reassemble.

 

[71DeuceAK]

Interesting thread! Bookmarking this for future reference as a possible soon to be M923A0 owner myself, heaven forbid mine does this and I have to do a similar teardown job.

 

[acme66]

Here we are pulling the motor down: https://www.youtube.com/watch?v=6gRVJmoqlw8

 

[M35A2-AZ]

I liked the video of the take down!

 

[Jeeperjoe]

Always wondered if you were a SS member, love your videos, good luck with the rebuild

 

[Zoidsfan77]

Just watched your video last night.
Thank you for posting your misfortunes, it may help others.

It is stuff like this though that makes me fear for my engine.

Good luck on the rebuild!

 

[71DeuceAK]

Me, too, a little bit, as a potential soon to be NHC250-powered M923 owner. Curious how easy the rebuild goes!