Now heard back from Castrol/BP.
Their response is that they do not recommend the use of their non-detergent 30
oil in manual transmissions.
Castrol does not recommend our Non-Detergent 30 oil for manual transmission
applications, and we believe the foaming was likely caused by some type of
contamination, perhaps water in the transmission.
Unfortunately Castrol does not offer a manual transmission fluid product in
Canada or the US.
This phenomenon is still a mystery to me as there certainly was no water in the
transmission as had drained it 2x before noticing the foaming.
rg
From: Olin Brimberry
Sent: Friday, February 24, 2017 12:13 PM
To: Roger Grace
Cc: Healey List
Subject: Re: [Healeys] Trans oil foaming
Roger,
Your post is good timing for me. I just recently replaced my gearbox and
installed Shell ND 30wt. After having a reoccurring drip, I thought it would be
wise to check the oil this past weekend. I forgot to check the level before I
cranked the engine, so I shut it down after it had run for about a minute.
Much to my surprise, I noticed a lot of oil foaming on the dipstick. The oil
level was just fine, midway between high and low. Always heard oil foaming was
a problem to maintaining proper lubrication of the parts. In engines, I
understand that foaming can be caused by over filling the crankcase.
Hopefully, the level is high enough that the foam is above the rotating gears
and bearings.
So, I too would be curious what the experts say. I too have the MT90 at hand,
but was concerned that the drip would possibly be worse if I switched.
Olin K. Brimberry, PE
HunterBane Engineering, PLLC
919-803-4274 (office)
919-522-1608 (mobile)
On Feb 24, 2017, at 11:18 AM, Roger Grace <roggrace at telus.net> wrote:
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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