[Peugeot-L] Turbo oil line seals

Hello everyone,

I have the exhaust manifold of my white Turbo off and checked it for straightness with a straight ruler and feeler gauges => about 0,5 mm gap. I also checked another exhaust manifold from my Turbo #2 and just today took it to a machine shop to even out the surface (I measured at least 0,7 mm gap, they shaved off 0,8 mm).

I would like to renew those oil line seals, they are probably over 20 years old and a bit flattened already. The first ring type seal (not an O-ring but a flat one, like a washer) can be replaced with an O-ring. The second one is in the return line junction flange.

I spend several hours calling and visiting different shops today and had no real success for finding suitable replacements... :-( I could try to order from Peugeot but it would take about 3-4 weeks (they order them from factory). I checked many hydraulics shops but I could only find (and bought) some O-rings that were made from
[url=http://www.sealsfast.com/pages/materials/nbr.html]nitrile rubber (NBR)[/url] but I'm not sure that those are suitable for such a high temperature as the turbo has? Their heat endurance is about -22 to 210 F or -30 to 100 C which sounds too low for me?

I also found (and bought) something better, [url=http://www.sealsfast.com/pages/materials/vit.html]viton[/url] o-rings: -4 to 392 F or -20 to 200 C. The cold resistance of viton worries me greatly. If there's -13 F or -25 C outside and I start the engine, will it leak?-(

Maybe the best material would be
[url=http://www.sealsfast.com/pages/materials/sil.html]silicone[/url]: -75 to 392 F or -60 to 200 C. But I couldn't find those locally today without leaving an order.

I would like to put the engine back together tomorrow... So, my options are:

1. Use the old and flattened seals (I don't think they leak yet, however).
2. Use the viton o-rings and hope they will work in winter too.
3. Use the nitrile ones.

I couldn't find answers to these questions:

1. What material are original seals? Silicone? Something even better (what)?
2. How much those seals have to endure heat?

This is really frustrating because I would like to do it right and not just hope for the best and wait for possibly fatal leaks...

(I also posted this same message to
http://www.505turbo.com/forum/index.php?showtopic=122)

-- 
Toni Lindroos <tonilind(at)peugeot505.info>
1985 505 Turbo Injection, 310 000 km + 1985 505 Turbo Injection, 190 000 km
1985 505 Turbo Injection, 475 000 km + 1985 505 GRE, 233 000 km
Ex: 1981 505 STI, 300 000 km
Turku, Finland 




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