I got into this discussion late, so am not sure what the original
question was, but from the various answers have been, I suspect that
this revolves around a very common situation with transmissions that do
not have syncromesh on first gear. Originally all the gears, including
first gear have the teeth tapered on the ends so they will engage each
other easily. The teeth on the gears with syncromesh retain the taper
over the life of the transmission since they never grind together when
engaging. The teeth on the first gear, not being syncromesh are a
different story. Over time the ends of the taper get ground off as
people try to shift into first while still moving and the gear teeth
slide across each other. This also happens when one sits at a signal
with the transmission in neutral and the clutch disengaged, then pushes
the clutch is and tries to shift into first before the transmission
input shaft stops rotating, again causing the gear teeth to grind
against each other. Once the taper of the teeth is ground flat on the
ends, it is now possible for the two gears to hit on the flat spot of
the teeth, making it impossible for the teeth to slide down the tapers
until they are engaged. To get past this problem, it is necessary to
put the transmission into neutral and let the clutch out a bit or put it
in second and do the same thing, then pushthe clutch in and shift into
first. This is a pain, but soon becomes second nature to those who have
driven cars without syncromesh on first gear for any length of time.
Cheers,
Dave
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