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These things are absolutely essential. Speedpilots have
two T-gears in their drive-live but masters only have one. There are 8:1
and 7.5:1 reduction gears but the 7.5:1 gears are only fitted to the back
of Speedpilots and an 8:1 will do. The only other type of T-gear is a 1:1
which is 'not' a reduction gear, dear boy, and is used to join two instruments
or change direction of drive in a restricted space.
The drive pin connecting the Speedpilot with the T-gear screwed to its back
must be the correct length and turn 'CLOCKWISE' looking at the front of the
unit. If it is turning the wrong way, the Speedpilot will move a bit and
then make a buzzing noise. Take the T-gear behind the speedometer and swap
over two opposite end fittings, by loosening the grub screws and pulling
the fittings out. Turn the nylon gear or worm shaft round as well and don't
lose the little thrust washers, one at each end. This will reverse the direction
of rotation and will make the Speedpilot click away in fits and starts as
it is supposed to. This is because it is driven by a system of pawls, ratchets
and eccentrics (like historic rallying) and worries people who expect it
to go round continuously like a Twinmaster.
There are two thicknesses of inner cable, the thicker 3.2mm cable is used
in most British cars with Smiths speedometers. Cutting the squared end is
only to be attempted by the intrepid or the panic-stricken as the wire is
liable to uncoil as the end is removed. It will NEVER lie flat again! Before
you do anything drastic, consult HE WHO KNOWS, as there may be an alternative
way of fitting the offending part. I also have the equipment for making new
inner cables. An inner cable should never make contact with the closed end
of its socket when fitted into its T-gear or instrument. The greater the
radius of any bends in your drive cables, the longer they will last. 6" radius
is the very minimum but a longer cable is advisable even if it shows.
If it doesn't work, DON'T PANIC!!! It is far more likely that you have fitted
it wrongly than that it has given up the ghost suddenly. Check the drive
line methodically, unscrewing each union and testing until you find where
the drive is interrupted. Then sit down and think like Winnie the Pooh.
Surprisingly enough, this usually supplies the answer. If you get that 'Eeyore'
feeling, email, ring or fax me but do try and
make it a couple of weeks before the next event in case you need to send
something in the post.
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