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kfunnyman
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Apr 5, 2012, 8:33 PM
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1948 Desoto fluid drive vent leaking oil?
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I'm assuming that the vent on the bottom of the fluid drive unit is to keep it cool while the car is operating. Air blows out of it non-stop. However, also oil(or perhaps the hydraulic fluid). More often than not it gets everywhere you don't want it to go. Especially on the exhaust which, of course, gets hot, turning the oil into white smoke. When you turn the car off, oil drips on the ground. What's wrong? :-)
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nickwarner
Veteran
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Apr 5, 2012, 9:34 PM
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Re: 1948 Desoto fluid drive vent leaking oil?
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Your vent is there to equalize pressures as temps change. If it were sealed, fluid that was added cold would expand and create pressure while driving, which would in turn blow out the seals. Typically you would have this problem from an overfilled transmission or a transmission that is getting way too hot. I'd find out right away which one is the case.
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kfunnyman
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Apr 5, 2012, 10:02 PM
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Re: 1948 Desoto fluid drive vent leaking oil?
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If my transmission is getting too hot, what's the next step? Thanks!
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Tom Greenleaf
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Apr 6, 2012, 12:25 PM
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Re: 1948 Desoto fluid drive vent leaking oil?
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How is this trans cooled other than that if anything? If engine isn't too hot then there may be too much friction going on in trans or overfilled as Nick just said.
This is tough as both an old car and no longer made so info is sketchy of course to me anyway but basics apply. Trans will get warm with about anything out there and must accommodate that.
Short of the mess does it drive and shift as you expect? How long a drive does it take for this problem?
Tom
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kfunnyman
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Apr 6, 2012, 1:00 PM
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Re: 1948 Desoto fluid drive vent leaking oil?
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It shifts and drives fine. The problem occurs almost immediately. There is a constant oily residue around the screen. When you turn the car off, a drip which eventually stops. No other leaks elsewhere. It's not motor oil. Thanks.
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Tom Greenleaf
Ultimate Carjunky
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Apr 6, 2012, 5:01 PM
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Re: 1948 Desoto fluid drive vent leaking oil?
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Have to do some guessing neighbor (you said once on or off open web that you were from an abutting state) but if you didn't change that fluid level than something funky is going on as we well know. My own 1948 JD Tractor is mostly GM OHV engine w STD trans of course that is so simple an adjustable wrench and pliers can do anything on it!
OK: We may need one of us here named " re-tired " who is amazing at older stuff - lots older than this. My take is this early automatic attempt for a transmission is that it changes pitch of stators depending on load like Buicks did with the "Hydromatic" which was really just one gear and changeable pitch as to the engine RPM vs load imposed on it somewhat like an unplugged fan directly pointed at one running both will turn. That meaning change the pitch of the powered one results in the speed of the unplugged one type thing.
Why the quick heat? Friction is my guess and why yet to be determined. Something must be slipping as it by your post happens too quickly for engine heat to be the factor. Others may not but I need help from you with this. Do you have a clutch for complete stops on this machine? Some did early on on other brands of vehicle.
At the moment I can't even though I have a clue about this is stymied by the quick heat and what the source would be?
Keep at it and all of us who recall wooden wheels - some here do! If we can't come up with a reason here you may need some now VERY old Phart to determine the heat source causing this IMO. Sad but I knew people that would have worked on this when under new car warranty and not one still with us - cry....
Tom
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