Hi Randall,
In an earlier post on this thread I said I had a non working overdrive after
a gearbox oil change.
This was in fact on an MGB I owned where I put in SAE 80W90 in error.
Drained and changed to the correct grade of SAE 20W50 and the overdrive
worked again.
I can only speak of a personal experience.
Regards,
Adrian
----- Original Message -----
From: "Randall" <TR3driver@ca.rr.com>
To: <triumphs@autox.team.net>
Sent: Saturday, November 08, 2014 9:57 PM
Subject: Re: [TR] J-Type Overdrive oddity
>> A much renowned small British oil producer and distributor
>> recommended 80W90
>> GL4 gear oil for my TR but recommended 20W50 engine oil for my MGB.
>> Work that one out if you can!
>
> Which overdrives? They aren't all the same. The J-type pretty much
> didn't care, it would run in whatever the gearbox maker
> specified. Probably work fine with sperm oil! <g>
>
> For the A-type, Laycock always said to use non-detergent motor oil.
> Standard-Triumph started out saying "whatever", then switched
> to the Laycock recommendation, then around 1960 switched back to only GL4
> gear oil (GL5 didn't exist back then). The story as I
> heard it (from an old dealer mechanic who got it from an old factory
> engineer) was that they felt they had fewer (warranty) failures
> overall using gear oil, even though that was opposite the Laycock
> recommendation.
>
> But, AFAIK, MGB never had the A-type. And evidently, their gearbox held
> up OK with motor oil, so that's what they used.
>
> The important point, I feel, is that neither type of oil is going to cause
> instant overdrive malfunction. If it doesn't work at
> all, there is something else wrong. It's possible that using the wrong
> oil might make it wear out faster, or more apt to break
> thrust washers or whatever; but changing oil isn't going to fix those
> problems once they have happened.
>
> Randall
>
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