David Brown 1594 water in cylinder.

[Mattscimmy]

Hi Chaps,

Could anyone advise again please.
Just rebuilt this engine, rebored block and skimmed heads new valves etc.
It ran fine on initial startup but overnight filled cylinder 3 with water, other 5 cylinders fine.
The reason for the rebuild was piston failure on number 3 cylinder possibly due to out of round little end eye.
I'm now wondering if xs cylinder pressure due to water ingress was the cause of the initial failure. This conrod has been replaced now.
Neither I nor the machine shop noticed any issues with the head or block to account for the water, so is there a known weak point or area I should particularly look at.

Thanks in advance.

 

[forblue]

Not good,can you drop sump without taking eng out if so you may be able to see if it has porous block, or take off cyl head you can still fill block with coolant and see where leak is if it is not evident, get the head crack tested.

 

[Mursal]

Double check its coolant not rainwater? If coolant hopefully head gasket.

 

[Oh Deere]

Did you rebore or rebore and fit liners. Can only be gasket , head or porous

 

[690 multi-power]

Agreed, it is either a porous cylinder jacket, cracked head or the head gasket is leaking

 

[Oh Deere]

We rebored a 3 cyllinder 880 a few years ago. Had it running briefly without water in it just to make sure everything was ok. Filled it with coolant to find a cylinder full of water next morning. Removed head and filled block with water to find one cylinder was porous . We have rebored many 4 cyl tractors with no issues . Had to strip engine and put a liner in that bore

 

[Mattscimmy]

Porous block is my worry.
Wherever it's leaking from is substantial though and I'd have thought a porous block would be a slow leak. This is partially filling cylinder 3 and putting about 5 litres into the sump overnight.
I'd suspected a head gasket issue before the rebuild as the filler cap would have some cream in it. It didn't obviously use water though.
Heads skimmed and new gaskets should have fixed that, so fingers crossed for a cracked head.
Thanks chaps

 

[Mattscimmy]

Rebored to +40 no liners.

 

[Mursal]

If you move the piston in the cylinder to see if leakage rate changes. As you probably know 6 cylinders stop always in 1 of 3 places, so moving the piston might help. Sometimes stripping again might not still show the leak.

 

[X344chap]

Has anyone had any experience with using NDT dye spray to show up cracks?

Something like this?

https://www.millenniumsuppliesshop....-cleaner-developer--dye-400ml-spray-727-p.asp

 

[Lincsman]

How about filling with coolant to a level just below the head gasket and seeing if any gets into the cylinder?

 

[Mattscimmy]

Thanks for the input chaps.
This project is on hold until the cows go out in the spring and I've got somewhere undercover to work on it.
I'll let you know what I find.
Cheers

 

[Mattscimmy]

Porous block. There was a hole in cylinder wall just above piston crown at bdc. Got it rebored and lined in situ. She's going great now done a couple of days muck spreading singing along merrily.
Thanks again

 

[Mattscimmy]

This is it before fitting the liner.

 

[Mattscimmy]

Not sure how the machine shop missed it first time round.