[Nobbc] Mark's gearbox

[Mark Darley]

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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