[Healeys] overdrive problem

[gradea1 at charter.net]

Hi Bob-I agree, Redline MT 90 can work as well, providing the gearbox
is well sealed. I'm talking about 90W gear oil (hypoy) which is what
it appears has been added to the OD to "get more Pressure"...Jim
mentions MT90, but I want to make the point not to add gear oil as
found in American transmissions.
I had a bad experience with Redline in the 100 gearbox, which is not a
very tight unit...it all leaked out overnight, from a trans that was
in a customer's car. We refilled it with 30W-ND and it stayed in the
box. Redline is a synthetic and has a very small molecule. Hank

	-----------------------------------------From: "Bob Haskell" 
To: "healeymanjim"
Cc: "healeys at autox.team.net"
Sent: Sunday June 13 2021 5:00:43PM
Subject: Re: [Healeys] overdrive problem

 Hank,

 Redline MT90 is not 90 weight oil. It's 75W90 GL-4 gear oil (similar
to
 5W40/10W40 engine oil). Redline's MTL (75W80 GL-4) might be a better
 match to the original specification (SAE 30/10W30). Both are safe for
 brass synchros.

 Cheers,

 Bob Haskell
 Austin Healey 3000 BN7/BT7 registrar

 On 6/13/21 7:49 PM, Henry G Leach via Healeys wrote:
 > Hi healeymanjim -there a few statements you made that trouble me
about
 > your overdrive.
 >
 > 1-why was there 90W oil in the trans? Was there an attempt to get
more
 > pressure with heavier oil?
 >
 > 2- if you can manually engage overdrive with the lever on the
 > right-the overdrive is working and pressure has been built up
enough
 > to switch from direct to OD (overcome spring pressure). However you
 > should probably measure the pressure with a gauge and insure that
it
 > is over 400lbs.(photo)
 >
 > 3-the mainshaft should have nothing to do with engagement
 >
 > 4-if the solenoid is good, and if properly adjusted, it should
shift
 > into OD if the switch on the dash is in OD. My guess is that the
 > adjustment is not by the book. Measure the solenoid and if it draws
 > about 8 Amps, it is defective.
 >
 > 5-you can follow the procedure in the workshop manual to remover
the
 > accumulator, remembering that a huge spring is pushing on the
solenoid
 > case and must be eased out. You should have the correct replacement
 > parts-piston rings or o-rings and any gaskets-and a proper puller
 > before you pull it apart, as just examining it and replacing it
won't
 > give you an answer, unless you see major scoring or broken piston
rings.
 >
 > 6- I would never use 90W oil in that gearbox. It will foam and
cause
 > problems in the overdrive and when cold adds additional problems
with
 > gear engagement. Use the 30 ND (won't foam)
 >
 > Take particular care in disassembly, as this is an involved
mechanism,
 > and must be handled correctly to achieve successful operation. 
 > Regards, Hank
 >
 > -----------------------------------------
 >
 > From: "healeymanjim via Healeys"
 > To: "healeys at autox.team.net"
 > Cc:
 > Sent: Sunday June 13 2021 3:33:31PM
 > Subject: [Healeys] overdrive problem
 >
 > is there such a thing as a stuck accumulator in the overdrive? a
few
 > weeks ago we changed the gasket on the side of the
 > case that houses the solenoid and arm. have been unable to get o/d
to
 > engage electrically ever since. the solenoid is new
 > and works perfectly as long as the overdrive mainshaft is not
turning.
 > it tries to move the arm but is unable. pushing on
 > the right side shaft lever for a second or two will engage the o/d
and
 > it will stay in o/d until the o/d switch is returned to
 > normal. it is like the accumulator has no pressure and does not
give
 > the boost to engage the o/d. can the accumulator be
 > removed without damaging it? it had MT 90 oil in it which we
replaced
 > with 30ND hoping to stop any more leaks but can
 > put it back in if it would help. any assistance welcomed.
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