What passage or part of the block is behind this casting hole???

[aquaforce]

I have been swapping fluids in my L175 so the engine had to come apart.
The cylinder head is cracked badly between the valves on both holes.

 

[aquaforce]

Once I opened the lower end up I found this casting hole
What is it and where could it go? Could coolant leak out of this area. It is directly below the pump housing casting area on the right side, front cylinder.

I know the crack in the head was letting coolant into the chambers so that was easy to figure but I was also getting water in the oil.

 

[aquaforce]

I found this rusty trail at the bottom of the liner on the rear cylinder so I believe water was getting in the oil there but I wonder about the casting hole too.

A head, sleeve and piston kit with rings, bearings and gaskets will make this thing like new but I have some work to do and the mystery of this hole to solve too.

Help

 

[Ob1kubota]

Wow that's an older engine I'm not familar with. Is this a true 'wet' liner block? I can't tell by the photos but suspect it is the typical grey iron bored that may not be worth your time and money unless you absolute need it for a numbers matching show tractor...

 

[aquaforce]

Wow that's an older engine I'm not familar with. Is this a true 'wet' liner block? I can't tell by the photos but suspect it is the typical grey iron bored that may not be worth your time and money unless you absolute need it for a numbers matching show tractor...

I believe 1976. I think there are only four years of production on this model.
Yes it is a true wet liner.

 

[Ob1kubota]

Then the rust ring at the base of the liner must be from a failed liner O-ring seal(s). UT the block and if sound, I'd check with Kubota Industrial Engines for a works kit and put her back in action....also ask about DCA additive for anti-cavation to prevent liner pitting with extended coolant so she will live for a long time to come and prevent early liner o-ring failure in the future. A good "seasoned" block is better than a green one any day of the week except for happy hour on Fridays..keep up the good work.

 

[aquaforce]

What is included in a "works kit"?
I am waiting for some prices on parts that I need to build it back but one dealer told me "each part had to be priced separately" after I asked if there were any kits available for piston and liners.

 

[Ob1kubota]

Works kits contain new pistons, rings, bearings, liners, o-rings and gaskets on wet block engines. This is the advantage of doing an inframe engine rebuild. Maybe because this isn't an industrial kubota engine they aren't available. I'm sorry I don't know for sure