Oil Leak Turbo Oil return Line

TD42T

2003 Td42Ti

I have an oil leak where i can see is between the flange on the oil return under the turbo.

I have replaced the gasket 3 times. Genuine Nissan one from Patrol Parts.
I have used sealant.

On the 3rd attempt I have even lightly sanded to make sure its flat.
After a few days drive I see oil weeping between the flange where the gasket and sealant is.
My mechanic mate has helped me too. We are at a lost.

I degrease to keep an eye on it and surely enough after a few days It seems like weeping comes from there and then runs down the metal pipe.

have checked Oil feed line and its dry as. Looked carefully underneath to make sure its not coming from top to side and running down.
Very odd.

Anyone came across this?

Yeah strange.

Assuming there's no scratches on turbo where the flange bolts over?

100% leaking from the oil flange to turbo not from the actual bolts of flange?

Warped flange on oil drain?

Too much oil pressure?

Assuming the bolts aren't coming loose?

Just my initial thoughts. It's happened to me but only when I had the turbo off 43 times and forgot tighten bolts up properly.


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Oil return pipe and hole on block is all clear and a direct path from turbo to block?

Can you please take photo showing turbo leak and photo of turbo to block pipe?


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i put the new gasket and sealant on monday. I degreased an hour ago to make sure its not old oil.
Ill take a picture so you can see the clean part when its abit darker later with a light so it looks clearer

then ill take a pic few days later of it weeping.

Quote:

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Originally Posted by AB

Yeah strange.

Assuming there's no scratches on turbo where the flange bolts over?

100% leaking from the oil flange to turbo not from the actual bolts of flange?

Warped flange on oil drain?

Too much oil pressure?

Assuming the bolts aren't coming loose?

Just my initial thoughts. It's happened to me but only when I had the turbo off 43 times and forgot tighten bolts up properly.


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Definately not blocked because when we undo. No extra oil is built up in pipe.
bolts not loose because we have to apply pressure to undo.

Im seriously wondering if warpage has occured or we are both crap at smearing sealant lol

Yeah you shouldn't need any sealant at all. Flange, gasket and turbo is fine.

Have you always used sealant on that?


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First time yes.
So I thought crap sealant.

Then second time non Sealant. Just the Genuine Nissan Gasket from Patrol Parts

Third time different grey sealant with the gasket from patrol parts.

Unless Patrol parts giving me fake gaskets lol

All done by my mechanic who does many turbo cars. He has checked. Oil not coming from anywhere else.
Cant be a "Patrol Thing" like the gear chatter haha.

Sorry mate just making sure, so each time 100% clean surfaces on both sides and no nicks or cuts on either plates?

It should be simple but if that's all good then look at warped drain or turbo or too much oil pressure and or blocked or inadequate drain building back pressure.


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Quote:

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Originally Posted by AB

Sorry mate just making sure, so each time 100% clean surfaces on both sides and no nicks or cuts on either plates?

It should be simple but if that's all good then look at warped drain or turbo or too much oil pressure and or blocked or inadequate drain building back pressure.


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Mate dont say sorry. Always appreciate your help.

I was even thinking crack on weld where tube joins flange but then i see the oil seeping between the two flanges so its higher than the weld.

Yep you're at the point now where you get another drain flange and ensure a clean surface on turbo 100% clean just gasket. Pain yes but at least you can eliminate a lot of ???? And go from there.


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Also keen for photos mate...


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had this on a 3 litre. the pipe flange warped was flattened but kept warping. ended up replacing the pipe

Yeah strange. If I was you I would clean 100% and get a new flange. Even a straight down flange with hose to block and go from there.

Not expensive and worth a try for sure.


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Im thinking warpage too because the pipe is a soft metal. The turbo is a harder metal
cause if you look at the turbo side where the flanges join. Theres nothing to it. Drain hole. Flat surface and two bolt holes.

Attachment 74824

Im looking on ebay I cant find that same one. Are all turbo oil return line size on the flange universal?

Say this one? https://www.ebay.com.au/itm/Turbo-Oi...4AAOSwZlZaFTCH

What turbo do you have? Ht18?


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Yes Ht18 Turbo

This one?https://www.ebay.com.au/itm/Turbo-Oi...4AAOSwbDFanlnn

Nah you don't need to spend that much on a full kit. You just need a straight flange and get hose and clamps from local autobarn, supacrap or repco.

I would personally get a straight flange and it just needs to suit a 51mm bolt spacing.

Something like this but have a search on EBay and maybe measure the vertical distance from turbo to block drain to make sure there's enough distance for the hose to do a nice even curve to your block for smooth drain and minimise sharp 90 degree turn of pipe so it doesn't kink if that makes sense.

https://m.ebay.com.au/itm/Turbo-Oil-...-/301682866510


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Barb style oil drain flange.


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Quote:

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Originally Posted by AB

Nah you don't need to spend that much on a full kit. You just need a straight flange and get hose and clamps from local autobarn, supacrap or repco.

I would personally get a straight flange and it just needs to suit a 51mm bolt spacing.

Something like this but have a search on EBay and maybe measure the vertical distance from turbo to block drain to make sure there's enough distance for the hose to do a nice even curve to your block for smooth drain and minimise sharp 90 degree turn of pipe so it doesn't kink if that makes sense.

https://m.ebay.com.au/itm/Turbo-Oil-...-/301682866510


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You are too awesome.
Thankyou.

I ordered this. My mate needs a feed line. I need the drain line.

https://www.ebay.com.au/itm/MAMBA-Tu...UAAOSw0hRZcZBz

Awesome that'll do. Make sure your mate pays $100 and you pay $22 lol


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Not to much crankcase pressure it's not breathing a bit hard ? Blocked engine breather

Yeah my thoughts too Tip...


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Quote:

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Originally Posted by Tip12345

Not to much crankcase pressure it's not breathing a bit hard ? Blocked engine breather

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Sorry i dont understand. Where is the engine breather? It has an oil catch can. Not much blow by.

Is it that round thing at the back of the rocker cover.
How do i clean or unblock it

Just remove the oil cap when running and see now much pressure its blowing out

Done.

Not a single breath of pressure or minimal I cant feel.

Does that mean my engine is healthy and the breather on the rear is fine?

Quote:

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Originally Posted by AB

Awesome that'll do. Make sure your mate pays $100 and you pay $22 lol


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lol He paid for it first with PayPal. he said all good.
He is like a brother now. Not a mate :D LMAO

And it starts again haha.
Im sure its warped.

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