6v92 oil leak

[Phasma2128]

DD 6V92 leaking oil. Yesterday a Marina mechanic advised that the oil is not coming from valve cover but is leaking from the turbo. It’s probable a silly question but will this be an expensive repair?

He also found a leak in my heat exchanger. Potentially Expensive?

 

[Captain Ralph]

The air hoses from the turbos are notorious leakers of some martin form of oil. The oil feed hose on the top of the turbo MAY be leaking. I did have a turbo return hose leak on my own 12V71TIs at the oil pan. These external repairs are easy. If your tech says it is an internal leak, then a rebuilt chunk is in order. Not the whole, Just the serviceable innards (the chunk).
Somebody needs to be more descriptive for us to help you.

Your picture shows a leak in the H/E cast. This is not good. The correct repair would be replacement.
You could try a cast iron or block welder shop. A bead or weld puddle on the inside may work, if the rest of the cast iron around the flaw does not crumble away.
Some epoxy or like patch on the inside may work but not to be a long term patch.

 

[Phasma2128]

To end the story…..
the oil leak is coming from an oil hose.
I requested heat exchanger replacement

 

[Captain Ralph]

I requested heat exchanger replacement

Ouch..

 

[Phasma2128]

Expensive?

 

[Phasma2128]

I wonder if it would be a good idea to replace the heat exchanger

 

[Captain Ralph]

To end the story…..
the oil leak is coming from an oil hose.
I requested heat exchanger replacement

I wonder if it would be a good idea to replace the heat exchanger

I thought that was in process.

 

[johnjen50]

Wow. Is that really a leak in the heat exchanger housing? Those things are monsters, thick cast iron. Did you have it pressure tested?

 

[Phasma2128]

I didn’t have it pressure tested.

 

[Hat52MY]

That will be one monster cost to replace. It would be worth taking off and having a good radiator shop evaluate.

 

[madhatter1]

Many parts like that can be repaired if you can find the right guy. I had a showerhead on one of the Cummins that had pinhole leaks on the inner pipe. Guy at yard I go to cut it open, replaced 90 degree tube and added short piece of straight to finish off, and welded the whole thing back together. Will it last forever, no. Did it reasonably extend service life, yes.

 

[whoover]

I too am sure that can be welded. I had new necks for the rad caps welded or brazed to my tanks. I had them removed and had the tube bundle cleaned at the same time. Radiator shop did it all.

Walt Hoover

 

[Phasma2128]

Walt…
was it difficult to remove?

 

[Captain Ralph]

I didn’t have it pressure tested.

I too am sure that can be welded. I had new necks for the rad caps welded or brazed to my tanks. I had them removed and had the tube bundle cleaned at the same time. Radiator shop did it all.

Walt Hoover

You can see the leak. Pressure no more than 8psi and an evidence trail is showing.
This is cast iron. Solder or Brazing would be a poor gamble. Poor adhesion and in a raw water environment. The iron has to go in an oven then when hot, welded, like a block with a compatible rod. As I mentioned earlier, a block welding shop should be consulted.
I thought a replacement case was ordered.

 

[whoover]

In my case it was a Cummins 903, removing the heat exchanger is a bit of work and really heavy because I didn't remove the tube bundle first. I could not get the rad caps to seal so new necks were in order. Cummins parts are harder to find so for you a new tank might be an easier solution if it's easy to get. As said earlier finding someone able and willing to do the welding could be hard. The times I have found capable people but are not interested to do the work are many. I'm sure I have about a 25% success rate.

Walt Hoover

 

[Captain Ralph]

Just woke up thinking about this.
I was incorrect. The leak is from the coolant side of the heat exchanger.
Maybe, maybe, a patch could hold up on a properly cleaned area.

Any luck shopping for another case?

 

[Phasma2128]

So far no luck. I talked to a guy in Grand Rapids Mi that said he MIGHT know where to get an entire heat exchanger.

I am assuming it’s a relatively low pressure system? If this rust hole is there what are the chances of others forming? I obviously won’t know until I get into it.

 

[johnjen50]

I’ve been watching this and thinking that perhaps it’s time to reconfigure your
heat exchanger with a newer LARGER exchanger that would help with the cooling needs of this engine. There are numerous threads on how under capacity these tanks are for the engines they serve. Has anyone replaced their tank with a larger tank of different design to add cooling capacity? I would think it’s just an exercise in replumbing.

 

[Phasma2128]

That opens up a whole different set of possibilities. I will ask the mechanic

 

[johnjen50]

How did you make out investigating a different heat exchanger?