[Nobbc] Mark's gearbox

[Mark Darley]

According to my notes, I have Napa Premium 30wt in there right now  
(as recommended), though I am beginning to question if I did  
something stupid and put 90 in by mistake!

Mark Darley
markdarley at mac.com
Mobile Phone 415 310 5252

58 1500 MGA



On Mar 15, 2010, at 2:17 PM, Randy Myers wrote:

> 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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>>>
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>
>
>
> -- 
> Randy
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