[Fot] A-Type Over Drive Question Again

[Bill Dentinger]

Amici...
Back when Mike Belfer was prepping my race car, I understood him to say that the TR transmission liked one oil weight and the overdrive liked another.  Therefore the oil he used was a compromise towards satisfying both.  
This was back in the 1980s, and I cannot recall the brand (maybe KENDAL, but I'm not sure).
Anyone else remember anything like that?  
Kas?
Bill Dentinger


-----Original Message-----
From: yellow04 via Fot <fot at autox.team.net>
To: FOT List <fot at autox.team.net>
Sent: Wed, Jan 1, 2020 7:03 am
Subject: Re: [Fot] A-Type Over Drive Question Again

In the gearbox that Tim is referring to, I used a brand new re-lined 
cone clutch in an OD unit that came from Bill Dentinger with Old Blue. 
No clue what the history of the unit was, but the cone clutch stuck to 
the brake ring in earnest for a several sessions. Operating pressure is 
in the low 400's. I did replace the oil with Redline MT-90 during my 
efforts to get the OD to release, and I am assuming the MT-90 helped. As 
Tim said, there were several laps around the paddock that first weekend 
with the car with the gearbox cover off and a mallet in hand, but it 
wasn't until the second weekend out with the car that the cone clutch 
released by itself.

It is worth noting I didn't like the shifting feel with the Redline and 
went back to Brad Penn gear oil. That OD unit has been in the car for 20 
race weekends now, and other than the need to bed in the cone clutch, it 
has performed flawlessly. Those A-types have proven pretty robust for 
me.

Henry

On 2020-01-01 08:54, Jay Galbreath via Fot wrote:
> MT-90 oil cured my rebuilt OD non release condition. It instantly
> fixed the issue. I continue to use it years later without a problem.
> Jay Galbreath
> WPTA
> 
> On Wed, Jan 1, 2020 at 8:23 AM Glenn Franco via Fot
> <fot at autox.team.net> wrote:
> 
>> On Wed, Jan 1, 2020 at 7:56 AM Tim Hutchisen
>> <hakhutch at roadrunner.com> wrote:
>> 
>>> Hi Glenn,
>>> 
>>> Having built numerous OD units, I have run into a couple of
>>> instances where the cone clutch needed to "bed in". If you
>>> installed a new cone clutch, the angle of the linings may not be
>>> an exact match to the brake ring and annulus and it will stick
>>> when applied. A good swift rap (or two or three) on the exterior
>>> of the brake ring with a dead blow hammer will release the clutch.
>>> Had this happen with Henry Frye's race car at Summit Point a few
>>> years ago. Driving around the paddock with the gearbox cover off
>>> and exercising the OD, releasing it with the dead blow hammer. It
>>> eventually worked it's way in with time.
>>> 

~~~

>>> FROM:  Glenn Franco via Fot
>>> SUBJECT: [Fot] A-Type Over Drive Question Again
>>> 

>>> 
>>> Now trans in neutral the output shaft of the overdrive appears to
>>> be locked up and will not spin.
>>> 
>>> Any ideas??
>>> 
>>> Thanks in advance
>>> 
>>> Glenn
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