[Nobbc] Mark's gearbox

[andy preston]

Mark, I'm in all day tomorrow on Tuesday, and will be driving down to San
Rafael on Wednesday so perhaps one of those days will work.  I'm also going
on The Saint Patrick's day tour on Thursday that starts in San Rafael at
11:00.

Regarding gearbox oil there are 2 camps, the one says use 30 wt and the
other recommends 20/50. I had a very sluggish O/D on my B GT which took a
long time to engage when the engine/gearbox was cold.  I filled the gearbox
and O/D with ATF and left it in there for over a couple of years and the O/D
worked fine with the thinner oil.  I replaced it recently with the
recommended 20/50 and it still works great.  Whatever sludge was in the O/D
was cleaned out by the ATF.  You could try ATF in your gearbox as a trial
and see if it makes any difference; it didn't seem to affect the performance
of the gearbox at all.

Andy

707 795 3480

-----Original Message-----
From: nobbc-bounces at autox.team.net [mailto:nobbc-bounces at autox.team.net] On
Behalf Of Mark Darley
Sent: Monday, March 15, 2010 1:46 PM
To: North Bay British Car Club
Subject: Re: [Nobbc] Mark's gearbox

Andy,

Do you have any time today, and where are you?
Give me a all if you are around, as I may come up as far as Petaluma  
around 3pm.
Mark
58 MGA with sticky gearbox!

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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