300 TDI oil leak

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portokali

Member
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37
Hi everyone, I have an oil leak on the rear of the sump. My original sump was pretty dinged up and bent so I replaced it and resealed with Loctite ultra black according to instructions. However I am still getting the leak in the same place. The photos show the leak after resealing and no oil in engine and somehow it still leaks. I do have the engine tilted down as I am replacing the transfer case. The engine was recently rebuilt and new main seal was installed. There are no leaks upstream, it's between sump and flywheel housing.
Is there a trick to sealing the sump? Or is there something else going on?

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R u sure that's engine oil and not a mixture of "old" engine oil and diesel ?

I don't think you are ever going to get it completely dry. And if it doesn't drip after 1 hour of standing it's called a "sweat" of oil
 
D1Nut said:
R u sure that's engine oil and not a mixture of "old" engine oil and diesel ?

I don't think you are ever going to get it completely dry. And if it doesn't drip after 1 hour of standing it's called a "sweat" of oil
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Pretty sure it is engine oil. I've cleaned this up several times and it keeps dripping. The strange thing is that there is no oil in engine at the moment and it's still dripping. I see oil sheen between back of sump flange and bottom of engine and flows down flywheel cover.
 
This are some photos of the old sump. The leak is in the same place. Between sump flange and bottom of engine.
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It is probably due to the sump flange not being completely flat. This tends to happen when people overtighten the bolts and warp it a tad.
If you take it off to hammer it completely flat then you will have the opportunity to see where the oil is coming from.
 
Stanleysteamer said:
It is probably due to the sump flange not being completely flat. This tends to happen when people overtighten the bolts and warp it a tad.
If you take it off to hammer it completely flat then you will have the opportunity to see where the oil is coming from.
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The sump is brand new. I just installed it and has similar leaks
 
portokali said:
The sump is brand new. I just installed it and has similar leaks
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Well if you fitted it and did the bolts up to the correct torque setting then either the leak is elsewhere and just looks like it is from the sump, or there is a source of a leak on the mating surface of the sump.
Or the sealant wasn't laid down evenly.
Best of luck finding it.:)
 
If from the rear, it could be from the main seal.
But you haven't run it up, because you have no oil in the pan.
Maybe remove it and see if you can see it tracking down
 
Firebobby1 said:
It can't be from the sump, if you haven't put oil in yet and it's a new sump??
It must be from another source.
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It can't be from the sump, even if he had oil in it as it would be below the level of the top of the sump!!!!
Unless he overfilled it like a complete maniac, which I don't think he is!!🤣🤣🤣🤣🤣
 
😂I didn't overfill. The sequence of events is that I noticed a leak. Saw that the sump was dented so drained the oil and put in a new sumo with RTV - torqued to spec. There is no oil in the engine besides what might be in the oil filter. A few days later I noticed the same leak with the new sump. It may be between the flywheel housing and engine block.
 
portokali said:
😂I didn't overfill. The sequence of events is that I noticed a leak. Saw that the sump was dented so drained the oil and put in a new sumo with RTV - torqued to spec. There is no oil in the engine besides what might be in the oil filter. A few days later I noticed the same leak with the new sump. It may be between the flywheel housing and engine block.
Click to expand...
That all makes sense and I would have done the same things in the same sequence.
I am now thinking that the oil must be coming from what is in the oil filter housing, or else maybe some where in the cylinder head which only seeps down when the engine is tilted seriously down to the rear.
 
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