[Fot] Fw: Type A OD leaks

[Jack Wheeler]

 I have rebuilt dozens of these, both for my race car and a number of street cars.  For the race car, I found a machinist (ex TR-3 racer) who could drill and tap 2 additional 1/4" holes in the adapter plate & gearbox housing, to the inside of the 2 bottom bolts that are about 6" apart.  These bolts are as close to the gearbox housing as he could get, and still fit them in.  I think we used a short (3/4" long?) 1/4" grade 8 bolt with Locktite.  This seemed to reduce the leakage considerably.
If Bryan Brazelton has one of my old overdrive gearboxes around, perhaps he could check the exact location of the 2 additional bolts and let the FOT know.  I know I sold at least one close ratio overdrive gearbox with the car and a straight close ration 4 speed.  Don't know exactly what is with the car today.
Cheers.
Jack Wheeler

   ----- Forwarded Message ----- From: fubog1 via Fot <fot at autox.team.net>To: fot at autox.team.net <fot at autox.team.net>Sent: Monday, November 8, 2021, 10:01:27 AM ESTSubject: Re: [Fot] Type A OD leaks
  I don't use the gasket because it can compress slightly when things get loaded in use.I go metal on metal, chamfer/deburr/dress the mating faces, clean, Permatex "right stuff", good grade 8 bolts & red loctite.Done deal...
Glen Efinger
 
 
-----Original Message-----
From: Greg Blake via Fot <fot at autox.team.net>
To: Fot <fot at autox.team.net>
Sent: Sun, Nov 7, 2021 5:50 pm
Subject: [Fot] Type A OD leaks

I removed my TR6 type A OD box out of the TR3 race car today. It was removed because the last time on track, it was leaking badly. 

To my surprise, I found that the OD adapter plate was very loosely attached to the rear of the transmission, in fact two bolts had completed backed out and I found them when I removed the accumulator piston cover. Upon further disassembly I found that all of the adapter bolts were loose. 

When I built this transmission 2 years ago, I used red locktite on all of these bolts. I also had use the thin gasket with hylomar. Has anyone every seen these bolts back out like this before?  Any suggestions on repair work to make sure this doesn’t happen again?

I’m thinking of drilling all bolt heads and safety wiring all of the.  Have also thought of using helicoil on all of these since they are threaded into aluminum. 

Appreciate all thoughts on the mater. 

Greg

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