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[Healeys] Trans oil foaming

Subject: [Healeys] Trans oil foaming
From: tahoehealey at hotmail.com (Richard Kahn)
Date: Fri, 24 Feb 2017 20:57:46 +0000
References: <8515F329CB4643728B47B2F3B9EA5C52@WINDOWST93OFP9>
The detergent foams when agitated. It is designed to hold particles in 
suspension. It works well in engines not in the gear box.  Use 30 wt non 
detergent or MT-90 by Redline. It has been said that the detergent attacks the 
brass parts in the gear box. Also that the foam lowers the oil pressure needed 
in the over drive valve.


________________________________
From: Healeys <healeys-bounces at autox.team.net> on behalf of Roger Grace 
<roggrace at telus.net>
Sent: Friday, February 24, 2017 8:18 AM
To: Healey List
Subject: [Healeys] Trans oil foaming

I recently had the OD on my BJ8 apart to replace some parts ? 
bearing/accumulator/gaskets/O rings etc.
For a first sort of sacrificial oil fill I decided to use a non detergent 
Castrol 30 wt oil. Date codes less than 18 months old. Plan was to switch to 
the expensive Redline MT90 after testing and after a few hundred miles. This 30 
WT oil is often recommended by OD experts. I have built an electric variable 
speed rest rid to be able to test the transmission outside the car.
Overdrive worked fine and transmission sounded OK and ran it for about 2 hours 
to get the temp up (52C on OD case) and hunt for leaks.
So far so good.

Then after a few days of standing, and 2 minutes of running, I drained the oil 
(to fix a leak) and was amazed to see that the oil had foamed badly and there 
were big classic fish eye bubbles on the surface of the oil. Ambient was about 
14C. I did note that the oil coming out of the transmission was somewhat 
foamier than that from the overdrive drain plug.
See enclosed pix.
After standing overnight the oil looked normal again.

What disturbs me is that unless I had drained the oil I would not have been 
aware of the foaming and put it into service ....
Have now replaced with the MT90 that shows no sign of foaming on the dip stick.
Wonder if others have any ideas about this weird phenomenon and is it  a 
concern ?
rg


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