Transmission Leak

[Wayne P.]

I have a small drip coming out from the inside of bell housing.
Would this be caused from over filling the manuel transmission.
I had the seals replaced before installing. Thanks

[Stuart F.]

Re: Transmission Leak

Wayne;

What lubricant did you use? Mine leaked like that after a shop put in the newer light weight synthetic lube thinking they were doing me a favor. After I changed back to good old 80/90 gear lube, all was well - and the gears were quieter too.

Stu Fox

[Wayne P.]

Re: Transmission Leak

Stuart I used 80/90 . I think it was synthetic Lucas .

[William C.]

Re: Transmission Leak

There is no front "seal" in the manual trans as such, by design the "full" level is below the point where leakage (at least on a flat surface) will occur and there is an oil "slinger" between the gear teeth on the input gear and the bearing to throw oil away from the bearing . Minor oil seepage past this system is then handled via a drainback hole in the front of the case via a low point in the front bearing retainer. Some part of your system in not "in balance" with the design.

[Wayne P.]

Re: Transmission Leak

Thanks. I will change the oil to non synthetic and I guess live with the drip.

[Domenic T.]

Re: Transmission Leak

William is right and I do lots of muncies and the book has been said to be wrong on the amount oe oil to use. Over filling is the major cause of that leak as the 4 bolt flange the TO bearing rides on hasn't had a history of leaking.
It used to be that you fill it 1/2 in below the hole when cold. That will get your little finger stuck if your not carefull.
Another pro recently told me that 1QT was the correct amount and if I remember they originally said 5 pints.
The hole William is talking about in front is a breather, the only one in the trans. I machined a seal to go there years ago before I found that it was necessary for the trans to breath. The newer boxes have a seal there but I havn't looked into the works of it latley.

DOM

[Wayne P.]

Re: Transmission Leak

Domenic. Thanks . I will lower the transmission fluid 1/2 inch .
Great replies from all.

[Domenic T.]

Re: Transmission Leak

Opps,
Why did I say 5 pints, (wrong place) but I know it was lower amount than the book said to use.

DOM

[Bruce B.]

Re: Transmission Leak

I believe that if the countershaft causes any wear in the hole in the front of the main case there can be an oil leak from that worn area. That happens especially when the oil level is a little high.
That happened in a 62 I had.

[Domenic T.]

Re: Transmission Leak

Wayne,
Bruce may of hit it on the head. The counter shaft will do what he says and that leak can easily be stopped on the car if things are not to worn. When we install a trans or if I rebuild one I clean and coat the area he is talking about with silicone gasket sealer. The shaft is not flush with the front of the trans, it is apx .030 recessed and as aluminum expands more when hot than the steel, the counter shaft will leak if not sealed by the installer and I don't think the book says a thing about sealer there.
Easy fix on car if you back trans away from bellhousing about 1/2 in or so, spray any cleaner that will get rid of any oil, take the silicone sealer and fill in the recess then tighten the trans against the clean bellhousing. As I remember the manual didn't talk about sealing the shaft at installation. When I rebuild the munci's I sandwhich a thin aluminum washer between silicone and let it cure keeping every thing flush with the trans surface Thin tape works till it cures. The tape pulls off but some guys install them with the THIN tape making sure it allows a flush fit between the trans and bellhousing.
By the way the thin washer I install between the shaft and bellhousing keeps the counter shaft against the intermediate plate where it can't move back & forth causing the wear that Brcue was talking about .

DOM