turbo oil return line blowing out air when boost leak testing

Joe02wrx · 07-09-2012, 06:36 PM

so this just recently started happening, theres a lot of air coming out of my turbo's oil return line when i am boost leak testing. it never used to happen and i can't think of any event that would cause this to happen. i have a Fp 68hta turbo thats pretty new less that 7k miles on it. SOMEBODY HELP i can't even boost leak test my car anymore because it escapes out of the line. i'm not sure if its effecting performance

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KillerBMotorsport · 07-09-2012, 08:10 PM

The oil seal isn't really a "seal" I'm really suprised to hear that you never head a leak out of it before. Maybe you just didn't hear it? Plug the drain & feed and continue your testing.

Joe02wrx · 07-09-2012, 09:26 PM

When I tested it before my whole system held pressure until I unplugged my hose. Now it only holds for a few seconds. It's not a slight leak it's a massive one. This is normal?

Joe02wrx · 07-09-2012, 09:26 PM

But thanks for the information I'll do what you said

Joe02wrx · 07-10-2012, 02:00 AM

Wondering if I blew a seal

KillerBMotorsport · 07-10-2012, 10:47 AM

If there's not excessive oil in either housing you're good. Remember, the oil seal isn't a real "seal". It's more a part/feature that prevents oil the oil from flowing where it shouldn't give the turbo orientation is maintained. When the seal wears you will have a symptom, almost always oil getting into areas it should not be.

Joe02wrx · 07-10-2012, 11:46 AM

Alright I'll take off the turbo and check both housings

Joe02wrx · 07-10-2012, 10:40 PM

No oil in either side

Joe02wrx · 07-11-2012, 11:19 AM

Looks like the coolant and oil line on my turbo got bent into each other so the hose won't go all the way up it? Or are they normally touching?

Spunky424 · 09-12-2012, 04:50 PM

ever get this resolved? just got a call from my tuner saying i have the same boost leak from the oil return drain from the turbo.

Acejam2k · 11-12-2012, 04:19 PM

Bump, any update?

Joe02wrx · 11-21-2012, 11:44 PM

Sorry didn't see the replies. I found out that only happens when you don't plug the crankcase breather hose that connects to your turbo inlet. Under other circumstances it would never see pressure. Just plug the crank case breather hose coming off the inlet

07-09-2012, 06:36 PM	#1
Joe02wrx Scooby Newbie Member#: 284636 Join Date: Jun 2011 Vehicle: 2002 Wrx wagon White	turbo oil return line blowing out air when boost leak testing so this just recently started happening, theres a lot of air coming out of my turbo's oil return line when i am boost leak testing. it never used to happen and i can't think of any event that would cause this to happen. i have a Fp 68hta turbo thats pretty new less that 7k miles on it. SOMEBODY HELP i can't even boost leak test my car anymore because it escapes out of the line. i'm not sure if its effecting performance * Registered users of the site do not see these ads.

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07-09-2012, 08:10 PM	#2
KillerBMotorsport NASIOC Vendor Member#: 198281 Join Date: Dec 2008 Chapter/Region: MAIC Location: Virginia Vehicle: 2005 WRX/STi WRB of course	The oil seal isn't really a "seal" I'm really suprised to hear that you never head a leak out of it before. Maybe you just didn't hear it? Plug the drain & feed and continue your testing.

07-09-2012, 09:26 PM	#3
Joe02wrx Scooby Newbie Member#: 284636 Join Date: Jun 2011 Vehicle: 2002 Wrx wagon White	When I tested it before my whole system held pressure until I unplugged my hose. Now it only holds for a few seconds. It's not a slight leak it's a massive one. This is normal?

07-10-2012, 02:00 AM	#5
Joe02wrx Scooby Newbie Member#: 284636 Join Date: Jun 2011 Vehicle: 2002 Wrx wagon White	Wondering if I blew a seal

07-10-2012, 10:47 AM	#6
KillerBMotorsport NASIOC Vendor Member#: 198281 Join Date: Dec 2008 Chapter/Region: MAIC Location: Virginia Vehicle: 2005 WRX/STi WRB of course	If there's not excessive oil in either housing you're good. Remember, the oil seal isn't a real "seal". It's more a part/feature that prevents oil the oil from flowing where it shouldn't give the turbo orientation is maintained. When the seal wears you will have a symptom, almost always oil getting into areas it should not be.

07-10-2012, 11:46 AM	#7
Joe02wrx Scooby Newbie Member#: 284636 Join Date: Jun 2011 Vehicle: 2002 Wrx wagon White	Alright I'll take off the turbo and check both housings

07-10-2012, 10:40 PM	#8
Joe02wrx Scooby Newbie Member#: 284636 Join Date: Jun 2011 Vehicle: 2002 Wrx wagon White	No oil in either side

07-11-2012, 11:19 AM	#9
Joe02wrx Scooby Newbie Member#: 284636 Join Date: Jun 2011 Vehicle: 2002 Wrx wagon White	Looks like the coolant and oil line on my turbo got bent into each other so the hose won't go all the way up it? Or are they normally touching?

09-12-2012, 04:50 PM	#10
Spunky424 Scooby Specialist Member#: 94966 Join Date: Aug 2005	ever get this resolved? just got a call from my tuner saying i have the same boost leak from the oil return drain from the turbo.

11-12-2012, 04:19 PM	#11
Acejam2k Scooby Specialist Member#: 42645 Join Date: Sep 2003 Chapter/Region: NESIC Location: MA Vehicle: 2007 STI BrenTuned Crystal Gray Metallic	Bump, any update?

11-21-2012, 11:44 PM	#12
Joe02wrx Scooby Newbie Member#: 284636 Join Date: Jun 2011 Vehicle: 2002 Wrx wagon White	Sorry didn't see the replies. I found out that only happens when you don't plug the crankcase breather hose that connects to your turbo inlet. Under other circumstances it would never see pressure. Just plug the crank case breather hose coming off the inlet