>For whatever reason, the leak I found most maddening was caused by a cracked
>OD drain plug gasket. Not having the correct replacement on hand, I cut one
>from ordinary gasket material, which was too thin, with the result first
>that the drain plug first bottomed against the screen retainer screw (mine
>is a very early unit), and then the threads bottomed in the casting. After
>finally making a thick enough drain plug gasket, the next leak was from a
>warped adapter plate (apparently caused by some over-spirited tightening of
>the long studs when reassembling the OD), and the leak after that was the
>shifter shaft seals. The leak from those seals runs down over the OD,
>making it appear that the OD is actually leaking.
Randall,
I have to chase down a leak in my GBX/OD this fall when the car is off the
road. Your report on the shifter o-ring rods leaking and dripping down on the
OD and the big brass cover.... is very enlightening.
Based on losing 3/4 of a quart in 500 miles using the single viscosity 50W
Valvoline racing oil and hearing a "geary" noise in the GBX... I topped up
the oil and tightened up the brass plug with a BF pipe wrench and new gasket
doped with Hylomar. Well I had the same leak. Based on voodoo logic I
decided to try the 80W-90 GL4 I had bought at AutoZone. This time the leak
was still there but greatly reduced.
I did replace the o-rings in the top cover during rebuild. Maybe those o-rings
are leaking. I wonder if the reduced splash in the gearbox using the GL4 would
suggest that the problem is the o-rings.
The real problem is that I don't know where it is leaking. I bought some
phosphorescent oil additive if I get really ambitious. This kind of thing ,is
hard to do without a lift.
I really still think it is the brass cap. I don't think the fiber washers are
thick enough or soft enough. I thought of finding a big thick o-ring from
McMaster-Carr to replace these fiber washers that seem so hard. The o-ring
would have to be hard enough to resist distorting as it was tightened. They
have many types of material offered... do you know what is appropriate... or
if the o-ring is a dumb idea.
I am so glad everybody is talking about this. I was feeling very incompetent.
I love the OD even with the leak. It transforms the car. I love the low
throaty sound as I pass a guy on the interstate.
Brian Sanborn
62 TR4 CT16260L-O - Groton, MA
My TR4 Restoration Web Site
http://www.net1plus.com/users/sanborn
E-Mail: sanborn@net1plus.com
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