915 gearbox

[Scootr]

I hope someone can help me. My car is an 86 911, I had my gearbox rebuilt, the only thing different is that I had the shop add a quaife diff, the problem is after installing and driving I have a pretty bad tranny leak, the only thing that I can trace it to is the breather, is that possible? I drove the car about 15 mi. and used about 1 quart of oil.

[Eugene at Pelican Parts]

Try to verify that the breather hole is facing towards the tail of the transmission (front of the car). It must face this direction or else it will spit.

[Bill Verburg]

Any chance the box was overfilled ?

[Scootr]

Originally posted by Eugene at Pelican Parts
Try to verify that the breather hole is facing towards the tail of the transmission (front of the car). It must face this direction or else it will spit.

Hey Eugene thanks for the reply, the guy at the shop that did the rebuild said to point it to the driver side but at this point I am willing to try anything. Is it possible that these breathers do infact go bad? Also I am getting more than just a spit. The clean underside of my car is now soaked with tranny fluid.

[Scootr]

Originally posted by Eugene at Pelican Parts
Try to verify that the breather hole is facing towards the tail of the transmission (front of the car). It must face this direction or else it will spit.

[Scootr]

Hey Bill, that was the first thing that I thought of. Tell me if I am wrong but I have always checked the fulid with the car level, if the fluid is at the bottom of the fill hole or if a small amout runs out it is ok.

[Zeke]

Originally posted by Scootr
Hey Bill, that was the first thing that I thought of. Tell me if I am wrong but I have always checked the fulid with the car level, if the fluid is at the bottom of the fill hole or if a small amout runs out it is ok.

That would be correct. But why it is spitting out is the interesting question. Seems like pressure is building up in there for a whole qt. to come out!

[ChrisBennet]

Point it forward of forwards but towards the right side a little (1 o'clock). Your profile doesn't indicate your location so I don't know if your driver side is on the right (UK, HK, Aus) or left (everywhere else).
-Chris

[Eugene at Pelican Parts]

Hmm... I pointed mine straight back and it doesn't leak up there.

[Bill Verburg]

Tell me if I am wrong but I have always checked the fulid with the car level, if the fluid is at the bottom of the fill hole or if a small amout runs out it is ok.

Yes, thats correct even a little below the exit hole is good. I have seen "mechanics" get a whole gallon in there though.

The vent orientation is another possible issue that I hadn't though of.

[Scootr]

Originally posted by Scootr
I hope someone can help me. My car is an 86 911, I had my gearbox rebuilt, the only thing different is that I had the shop add a quaife diff, the problem is after installing and driving I have a pretty bad tranny leak, the only thing that I can trace it to is the breather, is that possible? I drove the car about 15 mi. and used about 1 quart of oil.

[Eugene at Pelican Parts]

If it's not overfilled and not leaking from the breather plug, another way tranny fluid could get on TOP of the case is by flinging out through the clutch inspection opening up top. This would be indicative of an improperly installed mainshaft seal and would also be evident at the similar opening at the bottom of the case as well. Is your clutch getting wet?

[Scootr]

Eugene, Do you know where I could locate a new breather?

[Eugene at Pelican Parts]

Originally posted by Scootr
Eugene, Do you know where I could locate a new breather?

Sure. I can't imagine the thing breaking, but if you need one, call us up on Monday and ask for me. Or email me at eugene@pelicanparts.com

[Damomma]

Eugene, I hate to tell you but that "ain't " back!

[Scootr]

Originally posted by Eugene at Pelican Parts
If it's not overfilled and not leaking from the breather plug, another way tranny fluid could get on TOP of the case is by flinging out through the clutch inspection opening up top. This would be indicative of an improperly installed mainshaft seal and would also be evident at the similar opening at the bottom of the case as well. Is your clutch getting wet?

My cluch seams to be fine, I can look in the inspection hole and the flywheel apperars to be dry. It really seams to be blowing out of the breather. Is there anything else on top of the tranny that this could be comming from? I did not think that there was that much pressure in a gearbox.

[john walker's workshop]

breathers don't break. the ring gear slings oil, which will exit the breather if it's not pointing forward. crawl underneath and reach up top of the trans, and feel for the hole. you can crank it around with a wrench if needed.

[Eugene at Pelican Parts]

Originally posted by Damomma
Eugene, I hate to tell you but that "ain't " back!

The 'back' of the tranny. I call it the back since that's where the 'end' cover or tail is.

Scootr,
The only real opening on top of the tranny is that breather hole. The other end of it (inside the case) is kinda shaped like a fountain pen; a tube cut diagonally. I forget which way the open side of the cut actually faces.

If the clutch is dry, then the area around the inspection holes will be dry to (yellow arrows).

Lastly, the red arrows point to the case gaskets. These can leak even when new, but it would not be a very significant amount of fluid loss.

So try to orientate the breather as depicted and see what happens.

[Scootr]

Thanks Eugene, I will give it a whirl. Should you be able to blow through the breather rather easily? I can blow through mine without any resistance.

[ChrisBennet]

Originally posted by Scootr
Thanks Eugene, I will give it a whirl. Should you be able to blow through the breather rather easily? I can blow through mine without any resistance.

Yes, you should be able to blow through it easily. BTW: What does Swepco taste like?
-Chris