Transmission leak

[CentAr712]

My transmission will not stop leaking out of the oil-level control hole elbow. Today I replaced the copper washers with new ones but it still drips. I tried to get it fairly tight, but at some point you begin to get nervous about over torquing it. Anyhow, it's steel threads going into cast aluminum with the intent of compressing a copper washer, that's like a bad game of paper, rock scissors and I'm afraid the aluminum threads will pull out before I can get it tight enough to get it sealed off. Has any one tried rubber O-rings in place of the copper washers on that elbow? I was also wondering if sealing the copper washers in place with rtv silicone gasket maker / permatex would fix it. Anybody had the same problem? Thanks, Chris.

[berger]

I have read some Ural owners have used this product to seal threads from leaking oil....

50 mL Tube LOCTITE[REG] 567 PST High Temperature Thread Sealant

http://www.fastenal.com/web/products/de ... ku=0150214

[undysworld]

I have read some Ural owners have used this product to seal threads from leaking oil....

On drain plugs? Hmmm.

Is the tranny drastically overfull?

Can the plug easily screw down fully without the washer (as a test), or is there some reason preventing it from screwing down far enough to compress the washer?

Is there some fairly obvious mar in the tranny housing or plug which prevents the washer from sealing completely?

I think I'd avoid RTV. After a look-see as above, I'd start with a fresh washer, and if that fails I'd add a second washer and try that.

[CentAr712]

It's not the drain plug, it's the oil level control hole elbow; it has two copper washers sandwiched at the 90 degree of the elbow that points up. The purpose is so the tranny cant be over full, take the plug off the top of it and add oil to the fill untill it overflows from that elbow. It's the 1" steel elbow mounted on the side of the tranny. I've got the leak reduced to a slow drip, but a drip nonetheless.

[undysworld]

Oops. I was using the term "drain plug" sort of generally, since they are all essentially the same plug, albeit with different purposes. I am aware of the check hole's purpose. I (mis)understood that you were having a leak at the plug itself, not the elbow.

[CentAr712]

No, the leak is at the base of the elbow. There is a plug, more or less that acts like a bolt which holds the elbow on, it has a washer sandwiched on each surface; one against the tranny and one against the plug/bolt. There was no obvious marring of the surfaces.

[berger]

On drain plugs? Hmmm.

Yup...actually on the filter plug screw too.....large plug which carries the filter (you have to see it). If it is a minor drip, this stuff would work well.

[CentAr712]

My Ural has never leaked oil, maybe that's odd, but it hasn't.

[berger]

My Ural has never leaked oil, maybe that's odd, but it hasn't.

Neither has mine, but I know of some that have....especially when the oil filter cap starts to get sloppy.

[CentAr712]

I think I found what the problem was and a working solution. It does appear that the gasket surfaces were buggered a bit so refaced them. They still had marring that I couldn't remove though. The solution I found that seems to work is to spray the copper washers with Permatex "copper spray a gasket" gasket sealer. I also found out that the proper name of the part I am referring to is the banjo union.