Tractor might be shot - now working on compression testing and have questions

[Omnipotent]

OK, so decided to go test #1 and #3...both test at 440 PSI, so everything is working and the blown head gasket theory seems to be confirmed. Will be removing head and getting new cylinder, intake and exhaust gaskets and will report back when complete. Probably will also get the head tested for runout to make sure it's still in spec, might be able to do this myself but we will see.

Any other suggestions advice from seasoned tractor or diesel mechs please chime in if I'm going down the wrong path or you have suggestions on other items I should be checking/replacing while I'm in the top half of the engine.

Thanks

 

[WinterDeere]

Wow... never seen a zero! With other cylinders at 440 psi, you'd think even a blown head gasket would register something, albeit real low.

Hopefully that's it, though. Anything else that yields low compression is worse.

 

[RayIN]

Never seen zero;
With a zero psi, I'd suspect a big hole in a piston, or piston top jerked off.

 

[1Mech]

Or a dropped or bent valve, probably exhaust, but that should have made some unusual noise!
Regardless, looks like the head at least is coming off.

 

[Williy]

Don't forget to replace the head bolts if removing the head

willy

 

[Omnipotent]

Don't forget to replace the head bolts if removing the head

willy

Thanks, didn't know this was a thing, just figured like

Or a dropped or bent valve, probably exhaust, but that should have made some unusual noise!
Regardless, looks like the head at least is coming off.

Really hoping not, was going to do a leak down test, but decided to just dive in since the head gasket was already a known issue...today's the day to find out.

 

[RayIN]

My MF 135 had head studs instead of bolts. After 53 years the studs were rusted to the head. I had to soak them with PB Blaster every time I was near the tractor for a week.
Then I still had to use a bar to pry the head off the studs.

 

[hayden]

How old is this machine?

 

[Omnipotent]

OK guys, back and not the best news, bent rod but terrible damage to the #2 piston and cylinder. I have no idea what metal caused this, as nothing in the top half dropped, valves, springs, retainers, rods...I mean it was all there a together. My best guess at this point is the top ring on the #2 somehow floated on top of the cylinder and then got crushed/melted into the piston and damaged the head.

PICS

As you can see form the pics it's quite a bit of damage and I now have to remove the whole darn motor and I believe that is going to require me to break the tractor in half (looking into this so please let me know if you don't believe this step is necessary) and then open up the bottom and see exactly how much worse it gets.

Needless to say last night turned into a 12 pack night as I drowned my sorrows, but the work continues and then we will see ultimately how I will address it all.

 

[dodge man]

For some reason I don’t think it was the ring but possible. It obviously sucked something in though.