Frozen "coolant" advice

[OVERKILL]

Originally Posted By: alexanderfitu
Originally Posted By: Linctex


Yeah, right. Sure.
I have a bridge for sale, cheap.


Engine was purchased with 10 hours on it, not 0. Everything I see when working on the engine makes me believe that, why are you so confident it isnt?

I would agree with you that its scrap if the liners are not replaceable (kubota service manuals state to replace the liners when below a certain limit, is this an error?)

Im not going to put it in service if its quite obviously broken, makes sense to replace it now rather than have downtime!


A quick Google yielded this kit:

http://partswecan.com/product/liner-kit-kubota-d722-engine-excavator-aftermarket-parts/

 

[Donald]

Sounds like a mess. Why was there anything in the cooling system?

Maybe Kubota will do a factory warranty?

 

[Kuato]

Originally Posted By: alexanderfitu
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!


That is a shame...well from an uninformed point of view I'd have the sleeves removed and inspection.

 

[Claud]

The oil wasn't contaminated and it isn't blowing out coolant.
So don't fix a problem that isn't there!.
If the liner was cracked it show up pretty quickly.
Put it back together and see if it runs well for a good length of time. I do agree about changing the oil after a few hours to clear out any contaminants.
If it turns out you need to pull liners then that's life, but I think you are seeing bogeymen in every shadow.

Claud.

 

[alexanderfitu]

Originally Posted By: Kuato
Originally Posted By: alexanderfitu
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!


That is a shame...well from an uninformed point of view I'd have the sleeves removed and inspection.


Apparently they sleeves are part of the cast, but could be bored and new liners installed. The pricing approaches the cost of a replacement engine.

Originally Posted By: Claud
The oil wasn't contaminated and it isn't blowing out coolant.
So don't fix a problem that isn't there!.
If the liner was cracked it show up pretty quickly.
Put it back together and see if it runs well for a good length of time. I do agree about changing the oil after a few hours to clear out any contaminants.
If it turns out you need to pull liners then that's life, but I think you are seeing bogeymen in every shadow.

Claud.


True. Having spoken with a kubota specialist, they had the same sentiment until they saw the pictures.

Having felt a bit more closely today, I can feel a very small ridge at a very small section of the bore. Don't think there is any point putting it back together if there is any ridge that I can feel as its just going to destroy the rings.

I would hate to put the time/money into putting it back together and in service for it to go bang in 15 hours.

Their opinion is that the cylinder was a TDC and the mark resembles where the gudgeon pin would have been. The other 2 bores probably expanded and contracted. Explains why the core plug blew at that location.

 

[WyrTwister]

TDC ?

Thanks ,

 

[OVERKILL]

Originally Posted By: WyrTwister
TDC ?

Thanks ,


The piston was at Top Dead Centre.

 

[WyrTwister]

Sorry , senior moment , I guess . I should have known it was Top Dead Center . :-(

Thanks ,

 

[dlundblad]

What sort of application will this be used in?

Could you run it and get a UOA after the first 25-50 hrs of use?

*Missed your last post.

 

[alexanderfitu]

Originally Posted By: dlundblad
What sort of application will this be used in?

Could you run it and get a UOA after the first 25-50 hrs of use?

*Missed your last post.


Its to go in a diesel generator on the roof of a small businesses for battery/power backup for networking systems.

Id rather not lug a whole engine up/down again if I can avoid it

It would be possible I suppose.

Lets say there is a very slight ridge that can be felt in a very small area of the cylinder. I assume this will destroy the rings in short order?

 

[WyrTwister]

If the rest of the engine , can you buy a replacement block ?

Best of luck ,

 

[andyd]

How far will you have to tear down the engine to get that spot magna-fluxed?

 

[alexanderfitu]

I put a new headgasket on it and fired it up. Ran fine!

Did some compression readings, 450/470/460 psi!!

Seems as though its currently ok, so I am going to run it for a while and see what happens. I have bought a spare so if worst comes to worst....

 

[WyrTwister]

With those readings , it must be a diesel !

Best of luck to you ,