ZL600, water in oil

Botaken

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Apr 15, 2014
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Wis. Rapids, WI, USA
Early B6000 that gets use very little. Is getting water in crankcase. Do these engines have wet sleeves? I am hoping the leak is head gasket. Are they prone to cracked head? Can any of you more experienced owners give me some advice ~ how to procede? I do consider myself to be an amature mechanic. TIA, Ken B
 

North Idaho Wolfman

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Kubota's don't have wet sleeves.
Did it spend the winter with water or antifreeze in it?
Does the water get from the radiator to the oil pan at a rate that you can watch it go down?
They do have several freeze plugs that are on the inside of the motor.
 

Alexisferos

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or it could be just the head gasket, i know for sure that old head gaskets from a material called permanite loose their ability and just crack if they sit for a long time.
you can try and tight a little more the head bolts and see what happen.
 

Botaken

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Wolfman, Yes, engine did have coolant in crankcase over winter. Estimate about 2 quarts. Leak is very slow. Can not see it go down. I drained oil out yest. Cannot see any coolant draining after oil is out (drain plug out).
 

North Idaho Wolfman

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All the things your saying point to a leaking head gasket.
I would pull it apart and look for a bad spot in the gasket.
 

Botaken

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Update: Took the head off yest. The head gasket delaminates some from removing the head so it's hard to tell if/where it was leaking. I thing it was leaking on the left (valve) side. Engine does have cylinder liners... may I assume that they are dry? Just trying to determine other possibilities for a leak.
 

North Idaho Wolfman

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Yes it has dry sleeves in it, so your fine there.
Look real close on the head right between the valves, that's a common spot to leak.
Sometimes it is really hard to tell where a head gasket fails, especially if it's a minor leak.
 

Hemi1

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Aug 11, 2014
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I have the same issue. My kubota B6000 has water going to oil pan as fast as I can put it in the radiator. Any ideas if it is a freeze plug or not? And if so where are the freeze plugs located at? Thanks

1977 Kubota B6000 4x4 diesel with loader. 2 cylinder diesel.
 

North Idaho Wolfman

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Look under the gear case cover on the front and the valve cover.
 

HealeyBN7

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Indeed the liners are wet wet wet. There are several incorrect postings about the ZL600 liner construction. You can see in this photo as well. They don't get any wetter then this. They are just sealed with o-rings.







Since there were so many dry liner postings, I thought that maybe there was a dry sleeve version, but the parts list doesn't support that theory.

Wet wet wet, and easy to remove and replace.

Dean