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#4524661 - 09/24/17 09:49 AM Frozen "coolant" advice
alexanderfitu Offline


Registered: 12/10/15
Posts: 38
Loc: London
Hi all

I have a Kubota D722 that was supplied with water in the cooling system rather than coolant!

The engine sat on its delivery pallet for a year and we had cold weather (-6 deg c) for a month or so.

I believe the engine was only half full of water but it still did some damage. It popped one core plug out and cracked the thermostat housing. As its a cast iron engine, I ran it up to temp today to see if I could see any issues. Apart from the leaking thermostat housing, it ran fine. I drained the oil and it has no coolant in it. I had to pull the head off to replace the thermostat housing and found some marks that concern me.

This engine has 0 hours on it and is new apart from some idling. There are these marks on the front and back of the bore:



This mark is slightly above the core plug that popped out:





The engine runs fine and has good compression. Thoughts on what I should do?

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#4524664 - 09/24/17 09:54 AM Re: Frozen "coolant" advice [Re: alexanderfitu]
OVERKILL Offline


Registered: 04/28/08
Posts: 36441
Loc: Ontario, Canada
Looks like the bores got a bit rusty while it sat, and that's now coming off quicker on the loaded side. I wouldn't worry about it, just run it unless you want to re-hone the cylinders and put new rings in it.
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#4524668 - 09/24/17 10:00 AM Re: Frozen "coolant" advice [Re: OVERKILL]
2015_PSD Offline


Registered: 09/26/10
Posts: 7234
Loc: SE Texas
Originally Posted By: OVERKILL
Looks like the bores got a bit rusty while it sat, and that's now coming off quicker on the loaded side. I wouldn't worry about it, just run it unless you want to re-hone the cylinders and put new rings in it.
Agree; though if it were mine, I would probably do two short OCIs on the oil to dump the extra wear metals that will likely be generated from the rust.
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#4524675 - 09/24/17 10:06 AM Re: Frozen "coolant" advice [Re: alexanderfitu]
tcp71 Offline


Registered: 08/12/13
Posts: 273
Loc: Alberta
Is that a crack in the liner in the second picture?

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#4524677 - 09/24/17 10:08 AM Re: Frozen "coolant" advice [Re: tcp71]
Chris142 Offline


Registered: 06/05/03
Posts: 16819
Loc: Deplorable in apple valley, ca
Originally Posted By: tcp71
Is that a crack in the liner in the second picture?
looks like it to me.
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#4524680 - 09/24/17 10:13 AM Re: Frozen "coolant" advice [Re: tcp71]
OVERKILL Offline


Registered: 04/28/08
Posts: 36441
Loc: Ontario, Canada
Originally Posted By: tcp71
Is that a crack in the liner in the second picture?


Hard to tell, even zoomed in. It may just be a rust line from where the piston was parked, or it could, as you've noted, be a crack. If it is a crack, the engine is scrap, so hopefully it is just rust. The OP could try rubbing it clean with some oil on a rag.
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#4524687 - 09/24/17 10:20 AM Re: Frozen "coolant" advice [Re: alexanderfitu]
alexanderfitu Offline


Registered: 12/10/15
Posts: 38
Loc: London
Thanks for the quick replies!

Yes the second picture is the one I am worried about. That mark is opposite the core plug that popped out. Rubbing it with clean oil does not change its appearance. I cannot feel the mark at all.

This engine is designed to have liners replace, so I suppose I could get somebody to put some new liners into it?

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#4524688 - 09/24/17 10:24 AM Re: Frozen "coolant" advice [Re: alexanderfitu]
Kuato Offline


Registered: 10/23/05
Posts: 7094
Loc: Colorado
Sounds like a warranty claim with your supplier!
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#4524689 - 09/24/17 10:25 AM Re: Frozen "coolant" advice [Re: Kuato]
alexanderfitu Offline


Registered: 12/10/15
Posts: 38
Loc: London
Originally Posted By: Kuato
Sounds like a warranty claim with your supplier!


Ugh, engine was supplied 2 years ago and they have long since gone bust!

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#4524701 - 09/24/17 10:35 AM Re: Frozen "coolant" advice [Re: alexanderfitu]
OVERKILL Offline


Registered: 04/28/08
Posts: 36441
Loc: Ontario, Canada
Originally Posted By: alexanderfitu
Thanks for the quick replies!

Yes the second picture is the one I am worried about. That mark is opposite the core plug that popped out. Rubbing it with clean oil does not change its appearance. I cannot feel the mark at all.

This engine is designed to have liners replace, so I suppose I could get somebody to put some new liners into it?


What if you hit it with a piece of scotchbrite?
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#4524712 - 09/24/17 10:44 AM Re: Frozen "coolant" advice [Re: OVERKILL]
alexanderfitu Offline


Registered: 12/10/15
Posts: 38
Loc: London
Originally Posted By: OVERKILL
Originally Posted By: alexanderfitu
Thanks for the quick replies!

Yes the second picture is the one I am worried about. That mark is opposite the core plug that popped out. Rubbing it with clean oil does not change its appearance. I cannot feel the mark at all.

This engine is designed to have liners replace, so I suppose I could get somebody to put some new liners into it?


What if you hit it with a piece of scotchbrite?


No change, unfortunately.

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#4524719 - 09/24/17 10:53 AM Re: Frozen "coolant" advice [Re: alexanderfitu]
OVERKILL Offline


Registered: 04/28/08
Posts: 36441
Loc: Ontario, Canada
That's concerning, because generally if it is rust, you'll be able to change its appearance. A crack on the other hand.... you won't.
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#4524722 - 09/24/17 10:53 AM Re: Frozen "coolant" advice [Re: OVERKILL]
alexanderfitu Offline


Registered: 12/10/15
Posts: 38
Loc: London
Originally Posted By: OVERKILL
That's concerning, because generally if it is rust, you'll be able to change its appearance. A crack on the other hand.... you won't.


ahh, I see!

I think this is a crack. Its location opposite the core plug is not coincidental I believe.

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#4524723 - 09/24/17 10:54 AM Re: Frozen "coolant" advice [Re: alexanderfitu]
WyrTwister Offline


Registered: 01/13/13
Posts: 1513
Loc: Texas
Would it be definitive if you had it magnafluxed ?

Best wishes , :-)
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#4524727 - 09/24/17 10:57 AM Re: Frozen "coolant" advice [Re: alexanderfitu]
OVERKILL Offline


Registered: 04/28/08
Posts: 36441
Loc: Ontario, Canada
Originally Posted By: alexanderfitu
Originally Posted By: OVERKILL
That's concerning, because generally if it is rust, you'll be able to change its appearance. A crack on the other hand.... you won't.


ahh, I see!

I think this is a crack. Its location opposite the core plug is not coincidental I believe.


Then you'll likely need to get that liner, but preferably all of them, replaced. As if that one has experienced damage from the freeze event, the odds of the others being out-of-round is higher. I would not expect a huge price difference to do them all but I could be wrong, LOL
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