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Old 04-24-2017, 07:03 PM   #12
Paul
Porsche "Purist"
 
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Join Date: Aug 2003
Location: Wisconsin
Posts: 2,123
Garage
Quote:
Originally Posted by magno_grail View Post
Had the same problem on my friend's '98. The O-rings deteriorate eventually. You can buy a pair from the usual sources or a lifetime supply for about the same cost from McMaster. Large are -320 Silicone, small are -121 Silicone
Thanks for the lead. Is this the correct part for the larger one? (-320)

High-Temperature Silicone O-Rings

These silicone O-rings withstand temperatures up to 450° F. They have a round profile and are suitable for a wide range of static and dynamic sealing applications. All include material certification with shelf life, cure date, and traceable lot number.

Inch O-rings have a dash number and are sized to the SAE standard AS568.
Inch

Fractional

Actual

Dash
Number ID OD ID OD Hardness Specifications Met Temperature
Range, °F Color Pkg.
Qty. Pkg.
Wd.: 3/16 Fractional (0.210" Actual)
320 1 1/8 1 1/2 1.100" 1.520" Durometer 70A (Medium) Made of FDA Listed Material, SAE AS568, SAE J200 -80° to 450° Red 10 1283N263 $6.62

https://www.mcmaster.com/#silicone-o-rings/=17cerk6
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1998 Boxster with 7.8 DME, 2005 3.6 liter/325 hp, Variocam Plus, 996 Instrument panel
2001 Boxster original owner. I installed used motor at 89k.
1987 924S. 2002 996TT. PST-2
Owned and repaired Porsches since 1974. Porsche: It's not driving, it's therapy.
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