[Nobbc] Mark's gearbox

[Randy Myers]

Mark,

In an effort to eliminate possibilities... what weight oil are you currently
using in your gearbox?  MGA's use 30 weight, I'm interest to hear whether
your car is the same.

Thanks,

Randy Myers
'59 MGA


On Mon, Mar 15, 2010 at 2:00 PM, Mark Darley <markdarley at mac.com> wrote:

> I am finding that the hotter the car and gearbox get, the less resistance I
> get on the shift.  It starts out feeling like I am pushing it through
> treacle from 2nd to 3rd on a cold morning, and is fine after 30 minutes of
> driving.
>
> Could this be as simple as old grunge in the gearbox (It sat for 4 years &
> I have changed it out but not used any flushing fluids), or just thick cold
> oil?
>
> Should I use some sort of flush other than fresh oil?
>
> Has anyone put a lighter oil in the MGA transmission with success?  Should
> I?
>
> Thanks
> Mark
>
> Mark Darley
> markdarley at mac.com
> Mobile Phone 415 310 5252
>
>
>
> On Mar 9, 2010, at 5:40 PM, andy preston wrote:
>
>  Mark, I started a new thread because your gearbox was getting lost in the
>> tech session one.  I agree with Greg that if your gearbox has done 50,000
>> miles it's just tired, but is probably ok for many more miles before
>> needing
>> a tear down.  I like the idea of changing the oil, that might help a bit.
>> The syncros are probably worn which is why changing up or down is fairly
>> stiff.  Double de-clutching will help going both up and down the box.  I'd
>> try and avoid the 3rd. to 2nd., as much as possible.  Unfortunately
>> there's
>> no magic silver bullet here; the only way to fix it is with a complete
>> rebuild or another gearbox.  I've done a couple of MGB boxes before and if
>> and when you decide to do it will be pleased to help you.  In the meantime
>> I'd be more than happy to test drive your car and you can drive my early
>> MGB
>> which has the same gearbox except for the rear extension.  I've rebuilt
>> the
>> box on the B so you can also see how a new box feels.  You can also drive
>> the Coupe but that has a Ford Sierra 5 speed which is completely
>> different,
>> and that has a notchy first to second change.
>>
>>
>>
>>
>>
>> Andy
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-- 
Randy