Hi Tim
I don't think that these gear boxes were designed for rapid shifting. If
slower gear changing works OK then the synchros are Ok. As 1st and 2nd are
on the same shaft it is sometimes easier to pull the lever into 2nd to slow
the shaft down and then engage 1st.
This is exactly how the gear box behaves on my BT7.
In the days when these cars were built people generally changed down through
the gears using a double de-clutch method, particularly if changing down at
high revs and speeds.
The gear oil you use probably doesn't matter for the gears but may affect
the performance of the overdrive. SAE 30 was the original specification for
the gearbox oil. This is a non detergent oil that doesn't foam and pumps
properly through the overdrive unit. In Australia Valvoline 'running in oil'
is a straight 30 oil and is easily obtainable. Works just fine in my box.
regards fom West Oz
John Rowe
----- Original Message -----
From: "Tim Newton" <timnewton@menziesgroup.com.au>
To: "Healey List" <healeys@autox.team.net>
Sent: Friday, July 29, 2005 5:05 AM
Subject: gear crunch BT7
> Hi ALL
> Some wisdom on a matter that I have absolutely no knowledge.
> The problem I have is rapid changing between gears doesn't give a perfect
> synchro, particularly from 3 to 4, and
> usually causes a definite crunch. Some times when stationary it is
difficult
> to get into first, and shifting into second and then straight into first
> usually works. Slower gear change between all gears gives perfect
> meshing. Gear oil 20/60 is changed (old oil a was bit discoloured but no
> evidence of metal in the drain off). The clutch is well fully engages and
> doesn't appear any problem. Is this a gear selector issue , normal wear
or
> just how these boxes behave?
>
> Any comments would be appreciated, but unfortunately a lot of the list
replies
> are stripped by our server (yes our computer see's all list mail as
spam!). To
> ensure I receive all replies could you please place my email address into
the
> CC: addressee box timnewton@menziesgroup.com.au
>
> Regards
> Tim Newton
> 3000 Mk 1
> Aust
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