[Healeys] overdrive problem

Bob Haskell rchaskell at earthlink.net
Sun Jun 13 18:00:36 MDT 2021


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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