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FC Dipstick Tube O-ring
Posted by: JimBrandberg ()
Date: July 08, 2018 05:34PM

Is the o-ring on a FC dipstick something special? I used a regular round o-ring from a set, 11/16 if I remember right, and the owner reports a leak on that side of the engine.
I can't remember ever having trouble with one. I suppose I've usually just replaced them as I found them. This one was all loaded up with silicone and I found it impossible to get that off without ruining the o-ring.
It's a little tricky to get in or diagnose. It's a 61 so the lower shroud and the rear duct are welded together as one piece so the lower shroud must be installed before you insert the tube.
The Rampside has gone home so I'm thinking about it from afar. I just did o-rings and top cover gaskets.
Jim Brandberg
Isanti, MN
CorvairRepair.com

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Re: FC Dipstick Tube O-ring
Posted by: MattNall ()
Date: July 08, 2018 05:46PM

Did you have to push it in the hole? vs slipped in...

Should be fine...





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Re: FC Dipstick Tube O-ring
Posted by: Timothy Shortle ()
Date: July 08, 2018 08:19PM

I prefer to use the viton seal Clarks sells. Is it "special"? I would say "maybe" (use the correct inside and outside diameter).

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Re: FC Dipstick Tube O-ring
Posted by: corventure Dave ()
Date: July 09, 2018 09:23AM

I use the Viton. Also, it is easy to get the tube out of alignment, depending on the sheet metal and the one retaining screw. Just have to be sure the metal is lined up and not distorted "bent" to disposition the dipstick fill tube.

Corventure Dave

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Re: FC Dipstick Tube O-ring
Posted by: JimBrandberg ()
Date: July 12, 2018 07:50AM

I ordered an O-ring from Clarks. It looks like a regular 1/8" round o-ring. I think I used a 7/8 and the proper size is 13/16, it was broken when I removed it. I just thought I would post a follow-up in case someone is searching later.
Jim Brandberg
Isanti, MN
CorvairRepair.com

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Re: FC Dipstick Tube O-ring
Posted by: cnicol ()
Date: July 12, 2018 08:13AM

It's a pretty thick cross-section as I recall.

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later
2+2 gnatsuM 5691

+17 Tons of parts

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Re: FC Dipstick Tube O-ring
Posted by: steve c goodman ()
Date: July 12, 2018 08:51AM

I just grabbed a GM O-ring amd below are measurements:

cross section: .139"
ID: .800"
OD: 1.065"

When O-ring is installed it gets stretched a bit. I need a
little 'fudge' factor too, difficult to measure a flexible
O-ring.

best wishes, Steve
Rear Engine Spec. Inc. Golden, Colo.

1962 spyder 3.0L turbo---1965 Crown V8
1967 monza 110/4---1968 monza 110/4
1971 amante gt 110/4
CORSA/RMC/PPCC

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Re: FC Dipstick Tube O-ring
Posted by: JimBrandberg ()
Date: July 13, 2018 04:19AM

The 7/8 I tried at fist did not have to be stretched to install.
The 13/16 does need to stretch to go over the end of the pipe.
I'm getting the sizes from how they're arranged in an O-ring assortment box I have. It calls them 1/8".
The one from Clarks fits well.
Jim Brandberg
Isanti, MN
CorvairRepair.com

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