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Turbo oil drain pipe breather removal

 
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Eddyendo  



Joined: 15 Sep 2018
Posts: 3
Location: Wiltshire UK

PostPosted: Sat Sep 15, 2018 10:53 pm    Post subject: Turbo oil drain pipe breather removal Reply with quote

Hi Guys,
So recently rebuilt the turbo on my car but now the oil drain to sump pipe is leaking.
Iíve sources a replacement, however it does not have the inline breather box as is off a later 81 car. Mine is a 79.
Can I simply do without the breather box and blank off the pipe by the purolator?

The pipe up from the breather is a pain to route so seems like Iíd be better off without it?

Thanks
Edd
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Carrera RSR  



Joined: 08 Jan 2010
Posts: 1582
Location: Somerset, UK

PostPosted: Sun Sep 16, 2018 2:32 am    Post subject: Reply with quote

Itís a sump/turbo drain and breather upgrade by Porsche. Some turbos had the upgrade, some did not. Itís supposed to avoid oil foaming and restricting lubrication of the turbo. Itís also an added element to the breather system. I would be inclined to continue to reuse the same set up rather than not. The top pipe should be going to the head, not the purolator.
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1980 931 - forged pistons, Piper cam, CGT turbo, 951 ducted FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife LSD
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Fasteddie313  



Joined: 29 Sep 2013
Posts: 1556
Location: MI

PostPosted: Tue Sep 18, 2018 12:15 pm    Post subject: Reply with quote

If it's leaking at the rubber I think a hydraulic hose shop can replace the hose on it..
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Carrera RSR  



Joined: 08 Jan 2010
Posts: 1582
Location: Somerset, UK

PostPosted: Tue Sep 18, 2018 11:51 pm    Post subject: Reply with quote

Also reading this again, the pipe from the Purolator should be going to the air filer box and not the turbo oil drain pipe/air separator you speak of. Seems yours may not be plumbed in 100% as per Porsche configuration?
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1980 931 - forged pistons, Piper cam, CGT turbo, 951 ducted FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife LSD
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Eddyendo  



Joined: 15 Sep 2018
Posts: 3
Location: Wiltshire UK

PostPosted: Wed Sep 19, 2018 9:15 pm    Post subject: Reply with quote

thanks for the info guys.
Upon removing the old one I found that the pipe that goes into the top of the breather box had fractured, perhaps from being knocked when we were re-installing the turbo.

I've sourced 2 replacement hoses, both with and without the breather box, so I will try and keep it. Although routing the 90degree solid pipe may be a struggle with turbo in situe as the old one was a pain to remove.

I think as mentioned my lines aren't connected quite as Porsche intended. My car is running a large k&n type filter with no air box, so I think at some stage someone has linked the breather up to the Purolator.
I did think it seemed like a rather long run of pipework!

Cheers
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Cťdric  



Joined: 27 Aug 2004
Posts: 1745
Location: Sweden

PostPosted: Wed Sep 19, 2018 10:20 pm    Post subject: Reply with quote

Its possible with the turbo in place, even though it do feel impossible when you try it, it will finally pop into place. I would try to keep the updated one to get the best possible life out of my turbo. Even my S1 engine had the updated breather installed some time during its life, so they obviously thought it was important.
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Eddyendo  



Joined: 15 Sep 2018
Posts: 3
Location: Wiltshire UK

PostPosted: Thu Sep 20, 2018 12:21 am    Post subject: Reply with quote

Mine too is an S1 engine. So, ok Ill definitely try to keep the updated line then.

The replacement I received looks to have been over brazed in the area where the old on cracked and split, so perhaps this is a known point of failure?

Having done only about 10 miles to my village fete on my freshly rebuilt turbo, I want to avoid potentially damaging it!

Many Thanks
Edd
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Carrera RSR  



Joined: 08 Jan 2010
Posts: 1582
Location: Somerset, UK

PostPosted: Thu Sep 20, 2018 5:47 am    Post subject: Reply with quote

Turbo issues back in the day were mainly down to poor fossil based oil. Make sure today you are using a really good fully synth oil that can deal with the heat of the turbo.

The turbo engine had oil breathing issues. The upgraded breather system was introduced to improve positive crankcase pressure and improve oil draining from the turbo back to the sump. The line from the Purlator should not be connected to the oil drain top pipe. The oil drain top pipe should be going to a vent drilled into the head.
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1980 931 - forged pistons, Piper cam, CGT turbo, 951 ducted FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife LSD
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