Scored a rebuilt TH350 today for non the less, a freebie! 1K mi's, car switched to a 5sp!........Dillema= Vent tube is leaking out of the case, and not the tube. I want to pull it/clean it/seal it, then i'll run an external hose downward...... I don't want to hack it, and just gob a bunch of shit on the tube at the case. Removal? Just asking those in the know before I just attempt to pry it out....... I know overfilling and all that..... Just pulling the vent tube to seal it up........Thanks.
Invisible, the vent tube should never be low enough to leak fluid. And, it should never have high enough pressure to force fluid out. Are you sure you mean the vent tube on the very top? It can have green cap if plastic or it is slightly bent around 2" long off steel. Tom Hand
No- around where the vent is going into the case.........And it's a 1970 model that has the metal tube. slight, and I mean slight sign's of possible overfill, or venting, but is coming out of the case where the tube is inserted.
How sure are you that the dipstick and tube are matched to each other, and show the correct level? And was the level checked cold, or hot? It's pretty easy to put an extra quart in, and that can cause it to spew out the vent. I'd drain some fluid (yes, that means dropping the pan, although the early ones did have a drain plug) and see how it does, rather than mess with the vent.
Three things will make it push fluid from the vent. One is it's over filled, two an internal pressure leak or three a plugged vent tube. That tube is just pressed into the case a short distance. My guess is the tube it self is plugged, since it is not leaking at the tube end as you say. The tube should be facing downward. It can't be leaking up high, without leaking at the lower end. Trans may be over filled causing it to push fluid out the vent or the vent tube is plugged and the trans is developing internal pressure pushing the fluid out. Either way, fluid would exit the lowest point of the tube, if not plugged up. Bill
https://www.tooldiscounter.com/product/mityvac-fluid-evacuator-plus-23-gal-88-l-mit7201 I’ve used these for over fill boo boos as well as tons of other uses.
Thanks Peep's.....= The tube itself isn't plugged . Has seepage around the base of it where it's inserted into the case, hence the staining, and aforementioned staining trail. Not shiny, but the scars are there. Just going to seal it up, but was curious if the tube just popped out, or it had a tight press fit, which i'm sure it did. I'm sure I can fubar it if I try!
The tube is inside a flange that presses into the case. The flange has serrated ridges and is about 3/16" or so in length, where it presses into the case. They are not hard to remove when the trans is on the bench, in the car may be more difficult without wrecking the tube. Most of the 350 tubes I have seen are aluminum and easily broken off. Bill
Along the same lines that Squirrel is pointing out. Those, after market one size fits all trans dipsticks aren't really one size fits all. Take a walk thru a scrap yard some day and pull the dipsticks from several GM cars and you will see that they are all different lengths. Also, if you do drop the pan, install a drain plug, makes changing the trans fluid and filter a lot easier.
Out of the car now=swap for the manual....... =rebuilt, hence the silver paint job..... OG dipstick, pan...... The paint loss AROUND the vent tube itself is the indication that it has leaked where it was/is pressed in. The stains show it. Not coming from the tube outlet itself, but from where it's pressed into the case. Just venting perhaps, but i'll seal it up. I'll also run a vent line down to the tailshaft, although not needed. It's on the bench and not in a car, so i'll just do it once, and call it done.
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