In a message dated 97-08-28 08:04:49 EDT, drew@pixar.com writes:
<< This is a long shot, but does anyone have a good discription of
how the self canceling mechanism of the turn signals on a TR3
works? I looked at the control head on mine and it has a split,
pointed fork which sticks out from the part which is attached
to the steering wheel by the grub screws but I don't see any
thing on the stationary part of the control head which would
contact the fork when the wheel is turned. I suspect there has
to be something which pushed the turn signal lever back to the
center position when it passes the fork.
>>
The split fork should ride in a yoke which is part of a collar , all of which
then rotate with turning of the steering wheel. The control head itself , of
course stays stationary with steering, held in place by the stator tube. If
you hold the control head assembly in front of you, turn signal up, looking
at the back and bottom of the assembly you will see two metal square pegs one
on each side of the centerlilne of the unit. When you move the turn signal
lever off center, as you would when signaling a turn, it should stay in
position and one of those two square pegs at the bottom should then be
protruding. As you rotate the assembly first one direction then the other as
you would when you make a turn, the yoke with the split fork will pass this
protruding peg in one direction, then depress it on the return bringing the
turn signal back to the central position. .
If the turn signal won't stay in position or it's real stiff you might try to
flush it out by spraying some cleaner into the unit. They really don't
usually wear out, but they do get gummed up with 30+ years of dirt. I've
used carb cleaner, WD 40 and electrical spray cleaner with some success. Be
aware that the spray may cause some discoloration of the bakelite if it is
perfect. This will clean up with vigorous rubbing with 8 O steel wool.
The Triumph Register of America has a video on control head repair showing
complete disassembly. It's not easy though, lots of little springs, clips,
etc. requiring 16 hands in a tiny space to work.
Hope this is not too confusing. Any questions I will try to help.
Bob Paul
TS71101L STC62
TS45738L O
TS7280L
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