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ideola
Joined: 01 Oct 2004 Posts: 15548 Location: Spring Lake MI
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Posted: Wed Jul 20, 2011 3:06 am Post subject: NLA: o-ring seal for turbo bearing housing to drain line |
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Yet another NLA part in the growing list.
900 174 045 40
This is the rubber o-ring that goes between the K26 bearing housing and the oil drain line. Just went NLA. This is a real problem...hopefully, we can find a suitably sized generic o-ring.
Anybody know anything about o-ring specifications? I presume we need to know the I.D., the thickness of the material, and the heat- and oil-resistance requirements? _________________ erstwhile owner of just about every 924 variant ever made |
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Min
Joined: 04 Nov 2002 Posts: 2368 Location: Vernon, British Columbia, Canada
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Posted: Wed Jul 20, 2011 3:34 am Post subject: |
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Ya, o-rings are spec'd by id, cross section and material.
Min _________________ Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting. |
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ideola
Joined: 01 Oct 2004 Posts: 15548 Location: Spring Lake MI
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Posted: Wed Jul 20, 2011 3:58 am Post subject: |
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I can take some measurements shortly. The OEM o-ring is red...and looking at McMaster Carr, it appears that maybe the OEM unit is silicone? Check out this page:
http://www.mcmaster.com/#o-rings/=d8vxnp
Then expand the "General Properties of O-Ring Materials" section at the top of the page...and then check out the "silicone" column... _________________ erstwhile owner of just about every 924 variant ever made |
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Min
Joined: 04 Nov 2002 Posts: 2368 Location: Vernon, British Columbia, Canada
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Posted: Wed Jul 20, 2011 7:45 am Post subject: |
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Silicon o-rings are not recommended for use with hydrocarbons (petroleum fluids such as oil)
from that list PTFE is probably the most suitable, kalrez looks good at first glance but its low temperature spec is not good. Fluoro-silicone also looks decent.
You should be able to get o-rings in any of those materials once you know the size and match it up on a o-ring sizing chart.
Min _________________ Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting. |
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ideola
Joined: 01 Oct 2004 Posts: 15548 Location: Spring Lake MI
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Posted: Wed Jul 20, 2011 8:13 am Post subject: |
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OK, cool, will take some measurements tonight. _________________ erstwhile owner of just about every 924 variant ever made |
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macBdog
Joined: 16 Aug 2004 Posts: 1111 Location: Brisbane, Australia
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Posted: Wed Jul 20, 2011 10:18 am Post subject: |
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I have a few bags of turbo O-rings at home still in the dealership baggies, I'll dig them out and post them up.
From memory the material in Viton.
Don't burnor melt Viton, it will kill you, no joke. _________________ 1979 931 with a 350 chev
1973 911E with EFI
p-talk wrote: | I'm still convinced the word 'Porsche' makes people crazy in all kinds of ways |
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ideola
Joined: 01 Oct 2004 Posts: 15548 Location: Spring Lake MI
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Posted: Sat Jul 23, 2011 2:16 am Post subject: |
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Based on my measurements, the o-ring needs to be >=25mm (1") ID with a cross section of <=3mm (3/32").
Here's the kicker. A single Kalrez o-ring in this dimension is nearly $60. A package of 50 Viton® Fluoroelastomer in the same dimension is $11.08.
Viton® Fluoroelastomer resists chemicals and oil. Temperature range is -15° to +400° F. Durometer hardness is A75. Meets ASTM D2000/SAE J200. Color is black.
They also have them in brown for "easier material identification", pkg of 50 for $12.88. That's what I'm going to order. _________________ erstwhile owner of just about every 924 variant ever made |
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Grenadiers
Joined: 20 Feb 2007 Posts: 3222 Location: Nelson, WI & Prescott, AZ
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Posted: Sat Jul 23, 2011 3:25 am Post subject: |
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I checked with Porsche and this oring is discontinued here is the size 25 X 3,15 maybe you can match one up somewhere.
From Porsche dealer in minneapolis. _________________ '83 944 Track car.
'88 924S Track car.
'89 944 Turbo
2004 Winnebago Vectra monster RV
2012 Jeep Wrangler
2014 Kia Soul
2001 Ford F350 powerstroke |
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ideola
Joined: 01 Oct 2004 Posts: 15548 Location: Spring Lake MI
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Posted: Sat Jul 23, 2011 3:31 am Post subject: |
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Just ordered some in 3mmx25mm and equivalent inch measurements from McMaster. Will let everyone know how they fit once they arrive. They're only sold in packages, so I will have lots of extras if they work... _________________ erstwhile owner of just about every 924 variant ever made |
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Grenadiers
Joined: 20 Feb 2007 Posts: 3222 Location: Nelson, WI & Prescott, AZ
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Posted: Sat Jul 23, 2011 3:36 am Post subject: |
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I'll take a few from ya if they work. _________________ '83 944 Track car.
'88 924S Track car.
'89 944 Turbo
2004 Winnebago Vectra monster RV
2012 Jeep Wrangler
2014 Kia Soul
2001 Ford F350 powerstroke |
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ideola
Joined: 01 Oct 2004 Posts: 15548 Location: Spring Lake MI
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Posted: Sat Jul 23, 2011 3:41 am Post subject: |
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OK, hope to have them here by Mon-Tue at the latest. Will post back. _________________ erstwhile owner of just about every 924 variant ever made |
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bnoon
Joined: 12 Oct 2009 Posts: 607 Location: West Des Moines, IA USA
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Posted: Sat Jul 23, 2011 7:16 am Post subject: |
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Has anyone compared the o-ring from the oil feed housing? That's the o-ring I'm more worried about. For the return I just pulled an o-ring from my metric viton o-ring stash... the feed side looks to be a squared edge type of o-ring. Since I didn't have a new one, I just sealed up the stock one using silicone gasket maker and used the paper gasket that came with the turbo rebuild kit. _________________ '80 924 Turbo - SOLD!
1986 Porsche 944 Turbo - SOLD!
Porscheless |
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ideola
Joined: 01 Oct 2004 Posts: 15548 Location: Spring Lake MI
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Posted: Sat Jul 23, 2011 7:57 am Post subject: |
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Those are still available and included in the turbo installation kit that i sell on my site. _________________ erstwhile owner of just about every 924 variant ever made |
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stevekat
Joined: 19 Jan 2008 Posts: 719 Location: Los Angeles, CA
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Posted: Sat Jul 23, 2011 8:41 pm Post subject: |
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Curious, do these o-rings (and others) come in the Reinz engine gasket set? _________________ "Never get out of the boat. Absolutely goddamn right. Unless you are goin' all the way."
Gone to new home: '81 924T, US version, CGT Intercooler, UTCIS-PT, Euro DITC, Greddy Trust MBC, Forged Fuchs Flat Dish 6's, Factory Recaro's. |
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ideola
Joined: 01 Oct 2004 Posts: 15548 Location: Spring Lake MI
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Posted: Sat Jul 23, 2011 8:50 pm Post subject: |
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stevekat wrote: | Curious, do these o-rings (and others) come in the Reinz engine gasket set? |
Nope. _________________ erstwhile owner of just about every 924 variant ever made |
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