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1980 Porsche 924 turbo aesthetic restoration mainly
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MOTANUL  



Joined: 19 Nov 2018
Posts: 83
Location: ROMANIA BUCHAREST

PostPosted: Wed Dec 12, 2018 8:00 pm    Post subject: Reply with quote

Carrera RSR wrote:
MOTANUL wrote:

Upgrade: I understand that the turbo phase 1 system has some deficiencies.
In this case I would accept an upgrade (phase 2 system).


Pros and cons to series 1 and 2 turbos. Neither are better than the other


The car has oil leaks in turbo area. I started to change some hoses. Nothing can be done to improve the situation?

From what I read, it's hard to get a phase 1 turbo without oil leaks in turbo area.

"A turbocharger cooled only by engine oil led to short component life and turbo-related seal and seat problems. To fix the problems, Porsche released a revised 924 Turbo Series 2 (although badging still read "924 turbo") in 1979. By using a smaller turbocharger running at increased boost, slightly higher compression of 8:1 and an improved fuel injection system with DITC ignition triggered by the flywheel, reliability improved and power rose to 177 hp (132 kW; 179 PS). "
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1980 Porsche 924 Turbo (931) diamond silver metallic/helios blue metallic
sold Porsche 924 NA 1979
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morghen  



Joined: 21 Jan 2005
Posts: 8044
Location: Romania

PostPosted: Wed Dec 12, 2018 8:24 pm    Post subject: Reply with quote

You can modify it to the S2 crank breathing system or you can accept that its a dirty and oily machine
I did the later while the car was with me.
It leaked a couple of drops every few days...that was ok for me.
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MOTANUL  



Joined: 19 Nov 2018
Posts: 83
Location: ROMANIA BUCHAREST

PostPosted: Wed Dec 12, 2018 9:57 pm    Post subject: Reply with quote

Anyone know where I can find a scanned service plan or user manual for porsche 931 1980?? Here or PM. English is preferable...

I'm curious because neither the former car (924 NA) had. Maybe I can find useful information in it.
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1980 Porsche 924 Turbo (931) diamond silver metallic/helios blue metallic
sold Porsche 924 NA 1979
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CÚdric  



Joined: 27 Aug 2004
Posts: 1860
Location: Sweden

PostPosted: Wed Dec 12, 2018 10:33 pm    Post subject: Reply with quote

The s2 have an improved breather system, you can read about it in the TB folder ammong the documents I sent you in a PM. The TB gos through how to retrofit it on S1 cars, my s1 engine had it. It was probably developed to increase the draining and reducing the back pressure on the oil draining system from the turbo, and thus most likely increase the turbo life expectancy.

The later cars also have an improved exhaust manifold, turbine housings and improved seals on the hot sides to deal with heat issues, but many s1 cars have been uppdated during their lifetime. So its not clear which car have what system today.

Im not sure where your turbo is leaking, but it should be fixable, theres only so many places where oil can come from. Change the O rings on the oil inlet (a b**** to replace) and outlet to strart with. If you are unlycky like me the return line to the sump started cracking, and thus dripping oil.
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morghen  



Joined: 21 Jan 2005
Posts: 8044
Location: Romania

PostPosted: Thu Dec 13, 2018 12:13 am    Post subject: Reply with quote

I replaced the o-rings last year when i refurbished the turbo...so the o-rings should be ok..but that whole area became greasy, i suspect that the venting line that goes on top of the turbo is the fault for the oil leaks, i was never able to make that one stop leaking.
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MOTANUL  



Joined: 19 Nov 2018
Posts: 83
Location: ROMANIA BUCHAREST

PostPosted: Thu Dec 13, 2018 12:58 am    Post subject: Reply with quote

morghen wrote:
the venting line that goes on top of the turbo is the fault for the oil leaks, i was never able to make that one stop leaking.


The top one does not drop anymore. I put a new hose that resists 7 bars
After that, I noticed leaks to the rubber hose at the bottom of the pipe (venting line).

Unfortunately at the bottom there is a second rubber hose at 90 degrees (leaking a lot). I ordered it and I want to change it when I change the distribution and water pump.



[img] [/img]
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morghen  



Joined: 21 Jan 2005
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PostPosted: Thu Dec 13, 2018 6:11 am    Post subject: Reply with quote

Thats pop-off valve line coming from the intake.
There is so much oil in the intake because the crank venting system is not sufficient for the S1.
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MOTANUL  



Joined: 19 Nov 2018
Posts: 83
Location: ROMANIA BUCHAREST

PostPosted: Thu Dec 13, 2018 6:17 am    Post subject: Reply with quote

CÚdric wrote:
The s2 have an improved breather system, you can read about it in the TB folder ammong the documents I sent you in a PM. The TB gos through how to retrofit it on S1 cars, my s1 engine had it.


What's the exact file name to study it (from TB folder)? I downloaded everything. There are more than 20 files in it.

Ref to oil leak fix: 2 are solved.
After I change the last rubber hose, I want to clean turbo area very well to isolate the problem (if there is one after the replacement).

I think it would be good to take some pictures too. Maybe I already have "improved breather system".
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MOTANUL  



Joined: 19 Nov 2018
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Location: ROMANIA BUCHAREST

PostPosted: Sun Dec 16, 2018 5:56 am    Post subject: Reply with quote

I could not take pictures under the car because I did not have the car in my garage.

At first glance, much less oil was poured (80% less than before). Just a few drops. Vent duct is leak free (with new rubber hose up and down).

I have never cleaned the turbo area ever.

[img]



[/img]
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MOTANUL  



Joined: 19 Nov 2018
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Location: ROMANIA BUCHAREST

PostPosted: Tue Dec 18, 2018 12:28 am    Post subject: Reply with quote

I am preparing to change clutch release bearing 93111608204.
I spoke to someone who recommended me to change the engine bearing and oil seal. (owner of Porsche 944 turbo).

I have found (on Autoatlanta) that 924 turbo has a bearing that belongs to the engine and can be changed. (can it be extracted??)
(10) 93110211100 deep-groove ball bearing TURBO
G047105311 Oil Seal - Genuine Porsche

[img] [/img]
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CÚdric  



Joined: 27 Aug 2004
Posts: 1860
Location: Sweden

PostPosted: Tue Dec 18, 2018 3:28 am    Post subject: Reply with quote

Are you sure it's you shouldn't change all clutch components? Because it's a pain to get everything apart. I wouldn't do it without changing the rest of the stuff while I'm there. You. Will not want to risk doing it again.

The pilot bearing can be bought separately and can be changed. I would change the rear seal as you got recommended. Check around for prices, they can be quite expensive for a simple deal.
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MOTANUL  



Joined: 19 Nov 2018
Posts: 83
Location: ROMANIA BUCHAREST

PostPosted: Wed Dec 19, 2018 1:57 am    Post subject: Reply with quote

The clutch disk has been changed recently. Bearing rattle a lot. (remained the old one when the disk was changed).

That's what I thought: change everything that has remained unchanged.

93111608204 cost aprox 150 euro
93110211100 deep-groove ball bearing cost aprox 35 euro
047105311 Oil Seal - Genuine Porsche cost aprox 20 euro

Even if they are relatively inexpensive (93110211100/047105311) they are not on stock in Romania (to be brought from abroad).



But at least I know I have to order them (I was not sure).
Thank you again
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sold Porsche 924 NA 1979
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MOTANUL  



Joined: 19 Nov 2018
Posts: 83
Location: ROMANIA BUCHAREST

PostPosted: Wed Dec 19, 2018 2:25 am    Post subject: Reply with quote

CÚdric wrote:

The pilot bearing can be bought separately and can be changed.


I think the turbo has "deep-groove ball bearing" 93110211100
http://www.autoatlanta.com/tinyresults.php?pn=93110211100;

Oe Supplier Clutch Pilot Bearing is for 924 NA? or also for turbo? 047105169A
http://www.autoatlanta.com/tinyresults.php?pn=047105169A;

Pilot bearing can rattle?
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1980 Porsche 924 Turbo (931) diamond silver metallic/helios blue metallic
sold Porsche 924 NA 1979
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MOTANUL  



Joined: 19 Nov 2018
Posts: 83
Location: ROMANIA BUCHAREST

PostPosted: Wed Dec 19, 2018 2:28 am    Post subject: Reply with quote

[img] [/img]
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1980 Porsche 924 Turbo (931) diamond silver metallic/helios blue metallic
sold Porsche 924 NA 1979
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MOTANUL  



Joined: 19 Nov 2018
Posts: 83
Location: ROMANIA BUCHAREST

PostPosted: Thu Jan 03, 2019 7:47 am    Post subject: Reply with quote


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