[Fot] A-type OD leaks

[f s]

I knew Bill when I was a kid. He rebuilt a diff for me.



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-------- Original message --------
From: "R. John Lye via Fot" <fot at autox.team.net>
Date: 9/21/23 10:46 PM (GMT-06:00)
To: jwheeler1947 at yahoo.com, fot at autox.team.net, jaboruch at yahoo.com
Subject: Re: [Fot] A-type OD leaks

Wow, Bill Boemmler is a name that I recognize from my time in St. Louis.  He was indeed
a skilled machinist and did some really cool tricks just like Jack described.

Thanks,
John

On Thu, 21 Sep 2023 19:35:35 +0000 (UTC), Jack Wheeler via Fot <fot at autox.team.net> wrote:


I've read a number of responses to this and all are good ideas.  When I was racing with an A-Type overdrive, I met a guy from St. Louis named Bill Boemmler, a TR-3 racer from the 50's & 60's.  Bill was also a skilled machinist and had a small machine shop behind his house.  Everything I know about the A-Type overdrive, I learned from Bill.

The bottom of the adapter plate is fastened by 2 studs, one in each corner.  It generally leaks between these 2 studs.  Bill would drill and tap for two additional small bolts (about 1/2" long), spaced evenly between the 2 studs.  Two holes were drilled in the adapter plate, aligned with two holes which were drilled and tapped into the overdrive housing for a 1/4" - 20 hex bolt.  This, of course, has to be done when the overdrive is apart, and the holes are drilled and tapped into the rear of the O/D housing.  When assembling, it is a tight fit to get these two bolts in between the gearbox housing and the adapter plate, so the bolts need to be short. just long enough to get a firm threading into the O/D housing.  They should be secured with either lock tight or safety wire.

This process is a little hard to explain, so if you want a better description either call me or contact me offline.  I had Bill perform this modification on all of my race and street car overdrives, and after this modification, I never had a leak in this area.

Cheers,

Jack

On Thursday, September 21, 2023 at 12:17:01 AM EDT, Joe Boruch via Fot <fot at autox.team.net> wrote:


I have a leaky a-type OD in my street TR4 that looks like it's leaking from near the adapter plate.  I have never taken one apart.  Can I just separate the OD from the trans and replace the gaskets or the adapter plate (I've heard that Quantum Mechanics sells an uprated plate and am checking with John to see if he has one) and then reassemble without needing to take the OD apart further?  There is a youtube video that shows an OD being separated and it looks like it is do able.  Thoughts?  JoeB
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