Yoshimitsu

Hi All,

this is going to be a very stupid question.... please bear with me as this is my first turbo vehicle....

The vehicle is running a Garret GT35/82R single turbo on a custom turbo manifold, with a turbo smart 40mm wastegate and 2 x Blitz dumpvalves...
Custom intercooler and radiator and custom 76mm exhaust.

My problem is as follows....

There seems to be an oil leak from the exhaust housing where the top rhs bolt is.

I have googled the turbo and looked at the drawings to see where the oil feed lines are located. I cannot see that there is an oil feed in this bolt area ??

if so... why would it be "boiling" past the "bolt" and leaking onto the exhaust housing below ? And why an oil feed at this bolt location ?

How do i remedy this oil leak ?

thanks in advance for all your help

GrossPolluter

iTrader: (1)

for a single turbo upgrade, you should be able to see everything pretty well.

Are you talking about the oil pressure feed to the center bearing housings? Change the gasket, reseal fittings, or change fittings if necessary

Are you talking about the bolts that are bolting the exhaust housing to the bearing housing. The turbo may be leaking from the seal on the exhaust side, rebuild

or the bolts for the downpipe?
same solution as above

I would also make sure the previous owner has the proper oil feed to the turbo, ball bearing turbos use a restrictor,

GrossPolluter

iTrader: (1)

Also check whatever is above the turbo if it is straight just on top of the housing, maybe something is dripping on it.'
Or also check for cracks on the housing.

Yoshimitsu

Hi there GrossPolluter,

Many thanks for the replies. I have very little space in the engine bay as p/steering and a/c were retained with LARGE intercoolers also. Nothing went front mount.

See attached pics.

I have drawn a red circle on the one pic where there oil is "bubbling out of the bolt (cannot photograph the upper bolt where it originates from as it sits behind the oil feed bolt, so i photographed the lower mounting bolt and circled it... you can see the oil leak originating from the above bolt and running downwards) that fixes the turbo to ....heaven alone help me i dont know.

Sorry for being so dumb... but i have to learn somewhere.

thanks again for taking the time to help out.

regards

Victor

Yoshimitsu

here are some other pics of the engine bay so that you can get an idea of space. i get the feeling i am going to be redoing alot of work here....

Vicoor

Looking at the pictures, the nut (bolt as you called it) that is circled is one of the four fasteners that attach the turbo to the exhaust manifold. If oil were bubbling out of there you would have a tremendous amount of smoke coming from the exhaust.

But if you look closely it appears that there is a trail of oil running down to that nut from under the center bearing housing section of the turbo. Probably the most likely source is the flange for the oil drain on the bottom of the center bearing housing. I would expect to find a flange that has a nipple for a hose or more likely a flange with a male AN nipple in roughly a -10 size
The flange will have two bolts that hold it on and a gasket that seals it to the bottom of the center bearing housing

Check there for the most likely source of your leak

Good luck

ArmyOfOne

iTrader: (12)

Looks about the same to me but if it is not the drain flange then I would verify the oil feed and ensure it has a restrictor in that line. I had similar problems and it turned out that the restrictor was too large.

GrossPolluter

iTrader: (1)

If its not coming from the oil drain, it looks like it might be coming from between the center bearing housing and the exhaust housing. Like Army mentioned, make sure your oil restrictor is proper size. If it is the proper size, you might looking at a turbo rebuild

Yoshimitsu

Hi Vicoor, Army And Gross,

Many thnaks for your replies. I am going to pull the turbo this holiday and take a closer look. Agreed it cannot possibly be coming from the securing bolts to the exhaust manifold. :S

I cannot get in far enough to see the return flange and will have to wait and see what i find out.

Thanks again for all the advice.

As a side note. If the turbo is damaged, do u think it would be a better idea to upgrade Turbo, downpipe and exhaust now ? Im not too keen on how everything seems to have been done With that in mind do i just simply order online from vendors such as HKS Garret Ect to get what i need and bolt it on ?

thanks again for all your help and advice,

regards

Victor

GrossPolluter

iTrader: (1)

You can probably take a look using a mirror or checking from under the car. I usually clean it off real well using degreaser/brake clean and compressed air, rags. Clean it off and run it and check as soon as you see just a little oil and where it is coming from

If it is coming form the turbo itself, I would just get it rebuilt and rebalanced. Most of the time the seals go bad over time, but it would be wise to have someone inspect the parts before it is resealed and reassembled if you are not familiar

Yoshimitsu

yeah agreed completely....

i did do the clean and start... thats when i thought it was coming from the mounting bolts...

will check it out again this weekend,

thanks again for the help