Hi has anyone seen a '62 Powerglide that leaks intermittently when not running and has not been driven for a couple of weeks? When it's running it doesn't leak a drop.[Maybe I should drive it more often] I pulled the inspection cover but everything is dry,maybe coming from pump but can't tell. It's got me baffled.Thanks Terry #43499
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Re: C-1 TRANS LEAK
the old PG's, when not used daily, will puke atf on start up after a several day rest. its their nature.i've learned to live with it. mike -
Re: C-1 TRANS LEAK
where does the ATF come out of on the PG?Comment
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Re: C-1 TRANS LEAK
They usually leek at the trans filler tube seal when it get hard.Comment
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Re: C-1 TRANS LEAK
thanksComment
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Re: C-1 TRANS LEAK
My '61 also leaks transmission fluid when it isn't driven often. I've learned to live with it. The amount it leaks isn't too bad. Some NCRS article I read said the fluid is leaking out the filler tube but what Roy said probably makes sense.Comment
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Re: C-1 TRANS LEAK
I saved this some time ago, hope the info helps.
"The solution. to the Powerglide leak-down problem came from Doug Faber of
Phoenix Ariz. He offered this advice for addressing the problems experienced
with 1955 -57 Chevrolet Powerglide transmissions. "Those years did not have
a breather for the transmission. General Motors used the filler tube as the
breather, which was fine until the cars sat a while and then leak-down
caused. the fluid level to rise above the bottom of the tube. When the
transmission was in use again, the pressure from aeration would cause fluid
to blow out the filler tube. In 1958 and later Chevrolet used a breather on
the top of the rear of the transmission case. To solve the problem on a
1955-'57 Powerglide unit, I put a breather (GM. Part number 8640496, costs
less than $3) on the front top of the extension housing. This fix works
great and is a cheap and easy solution"
The GM part number for the breather is now 1577100. "Comment
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Re: C-1 TRANS LEAK'JOSEPH" vary good
You do ROCK and are absolutely right about that , the trans dip stick is "somewhat" vented by not making a tight seal to the filler tube ,so as to act as an air vent. But if a "leak back" accurse draining the torque convertor in to the trans case it will fill up the case blocking the filler tube bottom area and cause it's seal to leak BUT if the seal don't leak and let the oil out =now there is no vent any more trapping the air inside which in turn raises the fluid level as it drains back. Then when you start the engine the trapped AIR's only way out is up through the filler tube along with any trans fluid in it.
In 58 up GM added a VENT L/S in the rear main case area the size of a quarter.And again your right GM had a call back or (fix-it) to help this problem as you stated by drilling and adding a vent (but in the rear housing and not the main case area as the 58 up were. It helped but not %100 because of the rear pump blocking and it being lower then the top case area.
Many old farts (like me)just drilled a 1/4 hole at the top main case to solve the problem using some grease to catch the filing and added a vent cap.
This would be a good Article for a NCRS guy to send to the Restorer , towards some award NCRS gives out.Comment
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