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Oil filler cap leak - neoprene or viton
Posted by: 66vairman ()
Date: June 10, 2018 10:37AM

The new oil filler cap hardboard gasket is leaking after only a few hundred miles. Not surprised, I just didn't get around to using a better material.

Past comments here suggest the problem is solved by making a gasket from neoprene.

I found some Viton sheet and considering it's higher temperature tolerance vs. neoprene I though I might try it.

Anybody tried Viton for the oil filler cap?

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Re: Oil filler cap leak - neoprene or viton
Posted by: davemotohead ()
Date: June 10, 2018 10:38AM

Is your PCV system working properly?





Email me at: Dave Motohead

1960 4dr sedan caveman car
1961 Rampside (Chetside)
1962 Rampside (Barnside)
1962 Short Rampside (Shortside)
1962 Monza 700 Wagon
1963 Monza 900 coup (General Nader)

-----------------------------------
Rust Free Lancaster Ca

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Re: Oil filler cap leak - neoprene or viton
Posted by: 66vairman ()
Date: June 10, 2018 10:44AM

davemotohead Wrote:
-------------------------------------------------------
> Is your PCV system working properly?

I checked and yes it is working. No blow-by issues.

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Re: Oil filler cap leak - neoprene or viton
Posted by: davemotohead ()
Date: June 10, 2018 10:47AM

Sometimes on older engines that leak out the fill tube I just stick a second cork gasket on top of the old one and makes the cap fit tighter and stop any dribbles.





Email me at: Dave Motohead

1960 4dr sedan caveman car
1961 Rampside (Chetside)
1962 Rampside (Barnside)
1962 Short Rampside (Shortside)
1962 Monza 700 Wagon
1963 Monza 900 coup (General Nader)

-----------------------------------
Rust Free Lancaster Ca

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Re: Oil filler cap leak - neoprene or viton
Posted by: corventure Dave ()
Date: June 11, 2018 04:03PM

You can also carefully crimp the oil cap tabs with pliers to tighten the cap fit to the filler neck. There is a sweet spot, not too tight, not too lose, that will seal the cap nicely. As long as the cap is not warped, a paper gasket should seal. However like Moto said, cork like gasket material works.

Oil droplets get splashed upwards a bit from I believe the fuel pump cam.

Corventure Dave

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Re: Oil filler cap leak - neoprene or viton
Posted by: 66vairman ()
Date: June 11, 2018 04:46PM

Yes oil tends to get thrown up against the oil filler cap when the revs. come up. Fine around town, but a some drips after driving on the highway for an hour. You know how oil spreads on hot tin. Fortunately nothing on the fan belt.

A CORSA tech article suggests welding a partial flap/diverter in the tube to correct the issue. I'd rather just find a better cap seal. The filler cap was tight, but the paper gasket was saturated with oil. I ordered VITON sheet material and will see how it works as a cap gasket.

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Re: Oil filler cap leak - neoprene or viton
Posted by: jasvair ()
Date: June 11, 2018 04:51PM

I have a special cap seal material that I had made and it works well.
John Sweet
John's Corvair Parts

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Re: Oil filler cap leak - neoprene or viton
Posted by: jjohnsonjo ()
Date: June 11, 2018 04:52PM

One thing that worked for me is placing a small sink drain stopper in the oil fill stem before putting the cap on. That blocks a lot of the splashing against the cap. It think it was in the tech guide. Also, I took some channel locks and tightened the grip of the oil cap itself.

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo

Bethlehem,Pa

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Re: Oil filler cap leak - neoprene or viton
Posted by: Bill Warren ()
Date: June 11, 2018 05:47PM

I found this in my most recently acquired Corvair along with some other surprises. Patient pending.

Bill Warren
Decatur, AL
65 Corsa
68 Monza
65 Monza

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Re: Oil filler cap leak - neoprene or viton
Posted by: MattNall ()
Date: June 11, 2018 05:51PM

Bill, have you cut open the patient yet?

Lots of blowby with that out?





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: Oil filler cap leak - neoprene or viton
Posted by: Nickshu ()
Date: June 11, 2018 05:52PM

I cut a piece of neoprene rubber, 1/16" thick I believe, and put it in place of the paper gasket. NO leaks.

Nick
_______________________________________________________________________
1964 Monza Spyder Convertible #435 - Rotisserie restored - Check out my restoration thread here: [corvaircenter.com]
Recreational Mechanic/CORSA Member/COG Supporting Member/US Navy Veteran
Other fun car: Porsche 911 GT3
Boring daily drivers
Northern Colorado, USA

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Re: Oil filler cap leak - neoprene or viton
Posted by: Vairismo ()
Date: June 11, 2018 09:14PM

Bill Warren Wrote:
-------------------------------------------------------
> I found this in my most recently acquired Corvair
> along with some other surprises. Patient pending.


I bought one of those at the GWFBT&SM several years ago, so not really a new thing. Good idea to solve some problems however.

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Re: Oil filler cap leak - neoprene or viton
Posted by: RobertC ()
Date: June 11, 2018 11:24PM

Or, you could go all out...

I believe the fitting / cap is Russell, but my mechanic at the time did the mod decades ago.


The bottom of the new cap fit the oil fill tube circumference at some point. Mechanic cut it off and brazed(?) the fitting on to the oil fill tube.

Believe the O-ring is neoprene - never been changed.

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Re: Oil filler cap leak - neoprene or viton
Posted by: ihscomputers ()
Date: June 12, 2018 04:41AM

If you don't mind the non-stock look, then Clarks sells C5407 for $14:

C5407 Oil Filler Tube Plug



Dean F. Gemberling
Columbus, Georgia


1963 Rampside w/305 V8 - Built by Ken Arnold in 1998

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Re: Oil filler cap leak - neoprene or viton
Posted by: Layton Curtis ()
Date: June 12, 2018 05:48AM

Gee Whiz! You guys make it so complicated. Just get some gasket material and cut round circles the same as the original gasket and keep stacking them until you get a good tight fit.

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Re: Oil filler cap leak - neoprene or viton
Posted by: glivorsi ()
Date: June 12, 2018 05:55AM

That nut/washer contraption looks scary. Are those pieces welded together? That would destroy the engine if it ever came apart.

Greg in Wildwood, MO (part of the St. Louis urban sprawl)

1965 Monza Vert 110PG, Crocus Yellow with black interior and top

2014 Honda Accord V6 (DD)
2017 Honda Pilot (wifemobile)
2012 Chevy Sonic 1.8L (kid's car)
1997 Honda CBR1100XX
2006 Mazdaspeed 6 (no longer own)

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Re: Oil filler cap leak - neoprene or viton
Posted by: cnicol ()
Date: June 12, 2018 05:55AM

Layton Curtis Wrote:
-------------------------------------------------------
> "Gee Whiz! You guys make it so complicated."

Craig replies:
From what you're saying I guess you don't want to hear about my PLC-controlled turbo-oil separator.grinning smiley

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: Oil filler cap leak - neoprene or viton
Posted by: Nickshu ()
Date: June 12, 2018 06:13AM

glivorsi Wrote:
-------------------------------------------------------
> That nut/washer contraption looks scary. Are those
> pieces welded together? That would destroy the
> engine if it ever came apart.


I was just at the Tri-State Corvair Meet...I had never seen this T-handle cap before but was surprised how many of the cars there were using one of these.

Nick
_______________________________________________________________________
1964 Monza Spyder Convertible #435 - Rotisserie restored - Check out my restoration thread here: [corvaircenter.com]
Recreational Mechanic/CORSA Member/COG Supporting Member/US Navy Veteran
Other fun car: Porsche 911 GT3
Boring daily drivers
Northern Colorado, USA

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Re: Oil filler cap leak - neoprene or viton
Posted by: Gregory_Miller ()
Date: June 12, 2018 08:59AM

ihscomputers Wrote:
-------------------------------------------------------
> If you don't mind the non-stock look, then Clarks
> sells C5407 for $14:
>
> C5407 Oil Filler Tube Plug
>
> [i1126.photobucket.com]
> ers/Fun%20Stuff/431096-1-1-714x527_zpsulvzjvug.jpg
I had one of those on my 65 when I got it, but didn't like the look so I replaced with a stock cap.

Greg Miller
Eugene, Oregon

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Re: Oil filler cap leak - neoprene or viton
Posted by: Ratt643 ()
Date: June 12, 2018 09:33AM

Stacked cork of varing thickness and gasket paper has worked well for me...


1964 Monza Coupe

Maryville, TN
U.S. 129 The"Tail Of The Dragon"

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