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big powerglide leak
Posted by: engr1962 ()
Date: May 13, 2013 08:15PM

Since my 63 shattered a lifter, the car has sat idle for about 2 weeks while I travelled and obtained replacement parts.

I came home today to find an about 18" puddle of red fluid right below the PG. I had been driving the car daily for a couple weeks prior and no leaks what so ever.

So, why would you think that it belched out its fluid like that? It was very hot day today.

Ideas? Pan gasket? Modulator? other ideas? All welcome!! smiling smiley

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Re: big powerglide leak
Posted by: MattNall ()
Date: May 13, 2013 08:18PM

TV rod O-ring..... 50 cent piece.... every time!! gg easy fix... I just explained it last week or so..





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: big powerglide leak
Posted by: engr1962 ()
Date: May 13, 2013 08:22PM

Thanks Matt. Sorry I didn't find the previous thread.

For me and the rest of us, what does TV stand for?

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Powerglide TV O-ring replacement instructions
Posted by: MattNall ()
Date: May 13, 2013 08:32PM

All covered in the FREE downloads listed in our FAQ's

1/4" O-ring available at FLAPS / Hardware stores... does not need to be Viton to last a long time... most we are replacing are 50 years old..


Throttle Valve....drivers side.......linkages connect to it...

remove pan and linkages....one 7/16" head bolt and it slips out..

That's about all there is... loosen bolt and slide shaft out....only goes in the clamp one way IIRC..

O-ring is on shaft...in groove. Lube it before re-inserting shaft.



[corvaircenter.com]








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




Edited 4 time(s). Last edit at 10/31/2017 11:22AM by MattNall.

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Re: big powerglide leak
Date: May 13, 2013 08:38PM

Does sound like a slow leak.
To check for sure, clean up the existing puddle.
Then put down a large cardboard section so you can verify where the drip is coming from.

Could be even easier and you only need to tighten the pan bolts!


Check the cardboard after a few hours and note what area is directly above the drip marks. Check that the fluid is not coming out of one area and tracking along a surface before it drips somewhere else.


Dan Davis ~ Pierce County, WA ~ CORSA Western Director + Corvairs NW + North Cascades Corvairs + Corvanatics
1966 Corsa Turbo coupe ~ ~ 1966 140 Corsa ~ ~ 1965 Monza 140/4 'Vert Sierra Tan/Fawn ~ 1964 Monza 'Vert (SOLD) ~ 1960 Monza Ermine White/Red PG ++ ~ 1965 Monza 140/4 Evening Orchid w/ ivory/black interior ~ 1962 Monza Wagon 102/4 ~ 1963 Rampside/Scamper ~ 1963 Red/Greenbrier ~ 1969 Ultra Van #468

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Re: big powerglide leak
Posted by: engr1962 ()
Date: May 15, 2013 02:08PM

Thanks guys, the pan bolts were _really_ lose in a couple areas. Interesting how it took a month to start leaking, and then only on a really hot day after it sat for a week.

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Re: big powerglide leak
Posted by: VegasVair ()
Date: May 15, 2013 02:24PM

Isn't this kind of leak also caused by a damaged PG cable sheath? confused smiley
Doesn't the leak only show up when the car has been parked for a while? confused smiley

65 Corsa 140/4 A/C convert.
CORSA+Vegas Vairs

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Re: big powerglide leak
Posted by: Frank DuVal ()
Date: May 15, 2013 02:41PM

The trick with automatic transmission leaks, not just our powerglides, is while operating, the torque converter fills with fluid. When shut off, the torque converter drains some, but the seals on the internal circuits hold most inside the converter. After a period of time, enough air seeps into the torque converter and the fluid seeps out, into the pan area. Now the pan is over full, and the fluid finds new external seals to leak out of, like TV rods, vents, shift cables, etc.

The theory is the seals are kept flexible when the transmission is in operation, and then after a period of inactivity, the seals get stiff, quit sealing, and the pan fills, etc. and the external seals quit holding also.

Frank DuVal

Fredericksburg, VA

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Re: big powerglide leak
Posted by: MattNall ()
Date: May 15, 2013 04:52PM

VegasVair Wrote:
-------------------------------------------------------
> Isn't this kind of leak also caused by a damaged
> PG cable sheath? confused smiley
> Doesn't the leak only show up when the car has
> been parked for a while? confused smiley
==================================================

Nope Shift cables will leak when running / driving... as I recall.





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: big powerglide leak
Posted by: bought1 ()
Date: May 15, 2013 05:12PM

The shift cable leaks after it sits a while. I had one puke out a bunch of fluid and it was at the shift cable. Check those meds Matt...GGGGGGG

Dave

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Re: big powerglide leak
Posted by: MattNall ()
Date: May 15, 2013 05:39PM

Right.. but it also leaks while driving...

I remember washing one off and taking a drive before checking..





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: big powerglide leak
Posted by: rnch ()
Date: May 15, 2013 06:27PM

'Course it could be BOTH of the above leaking....


eye popping smiley

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Re: big powerglide leak
Posted by: freeulster ()
Date: May 15, 2013 07:37PM

Like mentioned above, the torque converter takes a dump after a week of so of sitting.

Kent Donnelly
Living in sunny Brigantine Beach NJ
64 Vert
Philadelphia Corvair Assoc and CORSA
"EM's are faster than LM's because we don't have all those extra lug nuts weighting us down"

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Re: big powerglide leak
Posted by: Aquavit750 ()
Date: January 10, 2019 02:13PM

I see the throttle shaft o-ring is 1/4”. What is the size for the shift cable?

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Re: big powerglide leak
Posted by: stitch ()
Date: January 10, 2019 02:25PM

Clarks C878

"If you can't fix it with a Hammer, you have an Electrical problem."
Stitch...
Schertz, Texas.
(Smallish town/burg 17 mi. NE of San Antonio)

!967.. 4th body
8th off the line

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