oil feed/ returne line seal

[dr_jekyll]

what should i use to seal the threads on the union joints on my oil feed and returne .

 

i have braded lines but when they are tightend no matter how tight they are dont ther is still an oil drip.

 

i used silicone gasket sealent on my last turbo but i was told that could have caused the oil seals to break in the turbo.

 

is this true or is the sealent fine ,

 

thanks

Edited July 11, 2009 by dr_jekyll (see edit history)

[Tricky-Ricky]

If they still leak when fully tightened, then its possible you have the wrong fittings, i think they should be tapered, PTFE tape is a good one to use, but be careful with the silicone as if you use too much it only takes a piece to come off in the oil way and you will have problems.

Edited July 11, 2009 by Tricky-Ricky (see edit history)

[dr_jekyll]

any advance on that ?

[Tricky-Ricky]

Mind you i guess it would help if you said just what kind of fittings you have, straight or banjo?

For an altunitive you can also use thread lock sparingly, that quite often works, but you need to have clean threads first.

Edited July 11, 2009 by Tricky-Ricky (see edit history)

[dr_jekyll]

ther staight union jionts . ther new lines so the threads are clean

[Chris Wilson]

Photos. Flare seals need no sealant. They won't seal if the flare angles are different though. Parallel thread unions sometimes need a sealant, need more info. Most cheap turbo kits come with inappropriate unions, in my experience. A Greddy one on a Skyline here is a case in point, the fittings look more suited to a Homebase bargain clearance bin.

[dr_jekyll]

a more to the point question. can gasket sealen contaminate oil and cause it to perish the oil seals as thats what i was told the reson for my turbo failing after 3000 miles was and i dont want it to do it to my new turbo,

 

allthough the old turbo was xspower t61 and my new one is precision (garrett) gt4088

so the quality of turbi is quiet different.

[Tricky-Ricky]

First off turbo seals are made of metal so can't perish,(who told you that rubbish?) so very unlikely that gasket sealant could cause a failed seal, if the oil way was obstructed it would most likely cause the bearings to fail.

 

I suspect it was just down to the XS power turbo being pretty low quality, i have heard of the odd one doing more than 5K miles, but its rare;)

[dr_jekyll]

thanks . I.T.S said the turbo seals perished due to oil contamination , shortly after they returned my turbo in pieces.

[Chris Wilson]

The only thing gasket sealants MIGHT affect are lambda sensors. The 4088 is known to have serious issues on high performance engines, the turbine housing is normal grey cast iron, not Ni-Resist, as it was originally a diesel turbine housing. It erodes at high temps and takes the turbine wheel with it. It's well documented. ONLY buy a turbo with a specified Ni-Resist housing. The proper official Garrett site lists which has these,

 

http://www.turbobygarrett.com/turbobygarrett/products/turbochargers.html

 

for example, this turbo is suited to high power petrol engines:

 

http://www.turbobygarrett.com/turbobygarrett/catelog/Turbochargers/GT28/GT2860R_707160_5.htm

Edited July 14, 2009 by Chris Wilson (see edit history)

[Tricky-Ricky]

The only thing gasket sealants MIGHT affect are lambda sensors. The 4088 is known to have serious issues on high performance engines, the turbine housing is normal grey cast iron, not Ni-Resist, as it was originally a diesel turbine housing. It erodes at high temps and takes the turbine wheel with it. It's well documented. ONLY buy a turbo with a specified Ni-Resist housing. The proper official Garrett site lists which has these,

 

http://www.turbobygarrett.com/turbobygarrett/products/turbochargers.html

 

for example, this turbo is suited to high power petrol engines:

 

http://www.turbobygarrett.com/turbobygarrett/catelog/Turbochargers/GT28/GT2860R_707160_5.htm

 

 

 

Before you add further panic to some GT4088 owners Chris,

there are other versions of the GT4088 about that have Precision housings that are Ni-Resist material, myself and a couple of others on here run this version with no problems at all.

[Chris Wilson]

Do they say it's a Ni-Resist housing? What's a Tuesday without a bit more panic to add to the swine flu paranoia?