reverse manaul body 727- throwing oil out the breather

andyrob · Post by **andyrob** » Mon Oct 09, 06 8:41 pm

can any one help, my 69 roadrunner has a reverse manual body 727 with high stall converter & gearvendors overdrive, it throws oil out of the breather.
i have tried:
changing oil filter ( the old one did have some little bits of alloy on it)
removing oil cooler & lines & checking them for blockages
running the g/box a bit underfilled ie on min

Dave-R · Post by **Dave-R** » Mon Oct 09, 06 10:06 pm

I gave you a bigger list than that to check Andy.

Duncan! Blue! HELP!

Dave-R · Post by **Dave-R** » Mon Oct 09, 06 10:11 pm

What about a blocked air vent in the back of the bellhousing?

Is the fluid aerated?

Are you completely sure the oil can flow freely out of the trans, through the cooler, and back into the trans? It does not need to be completely blocked. A restriction will do it.

Cannonball · Post by **Cannonball** » Mon Oct 09, 06 10:20 pm

thought you said it is blowing oil out the dip stick tube andy rob

andyrob · Post by **andyrob** » Mon Oct 09, 06 11:08 pm

hi ducan,yes I thought oil was coming out the dipstick tube, but close inspection found an extented breather tube was pumping oil onto the dipstick tube

hi dave maybe I should try bypassing out the oil cooler, but it seems to be clear & the cooler & lines look almost new
the fluid on the bottom of the old filter did have air in it, but the other 99.9 % that drained out looked fine
how do you check for the air vent at back of bellhousing

cheers

Dave-R · Post by **Dave-R** » Tue Oct 10, 06 8:41 am

Yeah I thought it was the dipstick tube too?

andyrob wrote:hi ducan,yes I thought oil was coming out the dipstick tube, but close inspection found an extented breather tube was pumping oil onto the dipstick tube

Eh??

A breather tube from where??

The air vent is behind the torque converter. It means dropping the trans.

andyrob · Post by **andyrob** » Tue Oct 10, 06 10:34 am

breather tube is connected to the breather on top of the gearbox

latil · Post by **latil** » Tue Oct 10, 06 10:55 am

Top of gearbox is a smooth casting,no holes or bolts. The only breather is the vent by the pump housing behind the converter.

Dave-R · Post by **Dave-R** » Tue Oct 10, 06 11:01 am

No idea what the tube is you have there Andy. Sounds like some sort of modification?

Are you at the Metro Center tomorrow night? I will put on some work clothes and have a look for you.

Kev · Post by **Kev** » Tue Oct 10, 06 11:53 am

Dave wrote: I will put on some work clothes and have a look for you.

Glad you're not a stripper, Dave

andyrob · Post by **andyrob** » Tue Oct 10, 06 12:49 pm

cheers dave I will bring a trolley jack,will be ther unless the weather is totally crap, giz a ring on 07773767481
cheers

Dave-R · Post by **Dave-R** » Tue Oct 10, 06 1:41 pm

Bring an axle stand as well. I don't get under a car without one.

Kev · Post by **Kev** » Tue Oct 10, 06 2:10 pm

Dave wrote:Bring an axle stand as well. I don't get under a car without one.

Sound advice, Dave! I wince when I see blokes under cars with out one. There was a geezer killed up the road from my School when a Mini fell on him when the jack seals went. And didn't that dishy fella in Neighbours die like that?

latil · Post by **latil** » Tue Oct 10, 06 2:48 pm

Years back in Crawley a geezer tried to cut the brake pipes on his neighbours Austin Princess. Shame he cut the hydrolastic pipes,last thing he ever did.

Blue · Post by **Blue** » Tue Oct 10, 06 4:27 pm

I've seen the breather in the front pump plugged and a new breather drilled into the top of the extension housing with a hose or line running along the top of the box and up the bulkhead, I assume that's the sort of thing you've got. This mod I believe, is intended for transbrake cars where the fluid gets very hot, the level rises causing a leak at the stock vent in the pump. it's just a way of raising the point at which the box vents to atmoshere to avoid that leak. The case of the box is not under pressure so I can't see what would cause oil to squirt out of the breather if the level is correct and the box is not getting hot. If it is breathing into the dipstick tube (which is sealed) I could see that would cause a pressure build up.