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85RedCarrera 85RedCarrera is online now
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Join Date: Apr 2025
Location: NorCal Foothills
Posts: 254
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Finally got the replacement green Viton o-rings. Pulled one through bolt at a time and replaced them. Took some pics of what I found. I used the same o-ring lubricant, the same techniques, and was just as careful to make sure that the chamfered washers didn’t turn.

Unlike the red Viton o-rings, the green o-rings did not squish out on the bolt head side when they were torqued…

I have no doubt that the green rings did deform as the torque squashed them flat, but I don’t think that they ‘exploded’ like the red ones.. I think that more of the green o-ring pushed its way into the bolt hole, where it belongs.

I can now see the value of having the remaining case holes chamfered. Next time!

Red Viton o-rings after torquing:




The green o-ring with bolt snugged up, then torqued.:

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Dave
Project: 1985 Porsche 911 Carrera Coupe 3.2 to 3.4L "Carina"
PCA Member- Sacramento Valley region
Old 10-12-2025, 07:52 PM
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