My rear needs to vent

[HISSIN50]

Hello,
i am workin on the axle vent on the 88 GT vert. when i pull the fill plug on the pumpkin, i get a nice amount of suction as i yank the plug out. a suggestion from my friend (thanks MM!) led me to check the axle vent (forgot about that sucker). mine is on the pass side - it is a little check valve (think of a PCV valve) with a hat (to help keep crud out of the valve). it took a bit of pressure to get the valve to open, but it appears to work (hence the vac i have in the pumpkin), but there is no way i can see air being able to get back in. i would think air should get back in (i have permanent vac in the pumpkin right now).

i have read of others having a tube with some sort of filter on it - mine is (apparently) metric threads into the top of the axle tube with just a little valve, no tubing, etc. is mine weird?

i had entertained the idea of using a line and breather, but: in town i could not find a metric fitting with a hole in it (hardware store, parts store fuel filters and PCV valves did not have the right size and pitch threads) and i did not want to have to fab up a shielding method to keep road crud out of the filter.

do you guys have similar vent set ups as mine? if not, whatcha got? and im really interested if anyone has modified their vent at all (with a breather, etc).

please share any and all thoughts and opinions! many thanks ladies and gents.

 

[4dStang]

Hello,
i am workin on the axle vent on the 88 GT vert. when i pull the fill plug on the pumpkin, i get a nice amount of suction as i yank the plug out. a suggestion from my friend (thanks MM!) led me to check the axle vent (forgot about that sucker). mine is on the pass side - it is a little check valve (think of a PCV valve) with a hat (to help keep crud out of the valve). it took a bit of pressure to get the valve to open, but it appears to work (hence the vac i have in the pumpkin), but there is no way i can see air being able to get back in. i would think air should get back in (i have permanent vac in the pumpkin right now).

i have read of others having a tube with some sort of filter on it - mine is (apparently) metric threads into the top of the axle tube with just a little valve, no tubing, etc. is mine weird?

i had entertained the idea of using a line and breather, but: in town i could not find a metric fitting with a hole in it (hardware store, parts store fuel filters and PCV valves did not have the right size and pitch threads) and i did not want to have to fab up a shielding method to keep road crud out of the filter.

do you guys have similar vent set ups as mine? if not, whatcha got? and im really interested if anyone has modified their vent at all (with a breather, etc).

please share any and all thoughts and opinions! many thanks ladies and gents.

Hissen

On one of my 90's 4x4 Rangers, I ran the vents to the engine compartment on both axels. Then I stuffed about a half inch of cotton in the end. I put the tubes by the firewall harness, pointing down towards the area where the wires enter the car (drivers side) and ran zip ties the whole length of the truck. I did alot of river crossings and that was the only way of keeping my axels as 90W instead of water, crud etc. You could buy a 10 foot section of 3/8" tubing, a hose clamp and run that bad boy up high, where it is always dry. Worked great for me. I never had to change my pumpin oil.

CB

 

[hllon4whls]

Only bad thing about a vacum is that it will tend to draw in moisture.

As noted 4x4 owners run high vents for their difs. May be a good place to start.

 

[hllon4whls]

You know, I just read the title a different way. Is this a post about flatulence? OH wait you mentioned a vacuum. Getting down with a hoover upright?

J/K and I gave you a bump.

 

[giddyup306]

hehe I was gonna say something like that but hllon beat me to it.

 

[4dStang]

---Only bad thing about a vacum is that it will tend to draw in moisture.---

Somebody has to clean that hoover out! You have to have a dedicated non-carpet hoover!

 

[HISSIN50]

thanks guys - my title was written as such, on purpose (i had other, more explicit titles in mind, but wanted to be subtle).

do stang 8.8's come with a short one-way valve (like i have) or do they have a hose on them (i had read a hose with a filter on the end)?

i dont need the protection of a 4X, though that is a nice thought (just 'too' much for the stang. LOL). i would rather keep an oem set up if i can figure out if having vac in there is normal (Hllon hit on one thing i had thought of, let alone i dont know what a vac would do to the 'natural' flow of oil).

so what are your vent configurations? a one way valve or a hose/breather?

if i could have found a fuel filter with a correct metric fitting, i mighta' tossed that on. i dont want to drive it with the valve half poo'd out, like it is.

many thanks!

BTW, 'my' rear seldom needs help with venting - i must have a free flowing element in there.

 

[giddyup306]

I think the hose only came on truck 8.8's. BTW I'll forget you wrote that last sentence lol.

 

[89MustangGX]

My Mustang has the little check valve like you are descriibng while my F150 has more of a hose setup.

On my car the valve moves up and down like a PCV valve, so if yours does not move freely, I would think it is simply crudded up and needs to be replaced. I don't think there's much to gain by devising some crazy system for venting the rear axle in this situation.

 

[HISSIN50]

My Mustang has the little check valve like you are descriibng while my F150 has more of a hose setup.

On my car the valve moves up and down like a PCV valve, so if yours does not move freely, I would think it is simply crudded up and needs to be replaced. I don't think there's much to gain by devising some crazy system for venting the rear axle in this situation.

thanks Adam.

i, too, did not want to rig something stupid up (i have to wait for a new vent to be ordered, so i was trying to piece something temporary together). but then i thought i would ask about it, in case you guys have some neat trick/method you use instead of the stock set up. i also was not sure if my existing vent was rigged or oem.

i cleaned it up but it took some decent pressure to open the valve the valve door opened, but air had trouble making out the cap). then i played with it (and kinda broke it) and realized that there was no way for air to get back to ambient pressure (and im not real sure how it creates a vac).

thanks again!

 

[89MustangGX]

You know, I was just thinking...I think I should notify the proper authorities about your thread title. They might see fit to make a custom title out of it for you.

 

[HISSIN50]

You know, I was just thinking...I think I should notify the proper authorities about your thread title. They might see fit to make a custom title out of it for you.

hmmm, how about we dont. the one time i try to be cute and you are gonna' call me on it.

 

[Michael Yount]

If you've been driving it that way for a while - just didn't know it wasn't vented - it's likely not gonna hurt anything until you get your part in.

Why don't you just pull it's finger?

 

[HISSIN50]

If you've been driving it that way for a while - just didn't know it wasn't vented - it's likely not gonna hurt anything until you get your part in.

Why don't you just pull it's finger?

from the responses in this thread, i better not pull its finger or even talk about doing so. LOL.

just for info: what got me goin on all of this: the pinion seal started leaking a little (not out the seal, but out of the middle of the pinion flange!. i dont even think this is possible).
so the thought was that the vent might not be letting pressure out - and i know it aint lettin it in. LOL.
i bet you are right about driving it like it is - but i sorta messed the valve up when i was 'playing' with it. i was gonna rip the hat off so i could run a breather for a couple days to see if it made any difference.

many thanks for your input Michael (though i know you have a Dana and not 8.8).

 

[Michael Yount]

Mine's vented with the same cap/thingy your is. I guess I'm wondering why any significant pressure or vacuum would build in a sealed rear end anyway? Think about it. The tranny's aren't vented are they? Why do they vent the rear ends?

 

[ratrapp]

some manual trannys are.i remember putting one in a mid 90s dakota that was vented.if you plug the vent off you won't notice anything until you pull the plug out.you better have safety glass's on.

 

[HISSIN50]

Why do they vent the rear ends?

well, i would recommend one sees a doctor ASAP if the vent on the rear was missing.



Michael, i had not thought about it much - i dont know why [some] trannies are not vented but rears are. does gear oil expand a pretty good amount with higher temps? maybe the sealing dynamics on a trans vs a rear are different (the rear w/o a vent would be prone to blowing seals out, etc). i have no idea.

thanks again for the input.