tomwalling@pvh.com writes:
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The long saga of the transmission rebuild continues... This weekend's
weather
was sufficiently wretched here in Maine to allow me to work on the
reassembly
of my Transmission in the basement. I'm now at the point of refitting the
overdrive (a J-type) to the back. I had some difficulty when I took it
off,
as the unit didn't want to just "slide off" of the, but I had to keep
prying
it up to remove it. Naturally, it doesn't want to just slide back on
either. In looking into the O.D. internals, I see that the splines for the
1-way clutch and the annulus ring are not aligned. My trusty (but
grease-smudged and battered) Bentley's addresses this as follows:
"Using a screwdriver of suitable length, turn the splines in a
counter-clockwise direction until they both line up" (or something to that
effect)
Well, guess what? I have a screwdriver of suitable length, but the @#*%&
splines don't want to move even a millimeter! Does anyone on the list have
any experience with this? Am I missing something here, or do I just have
to
be more patient and keep trying? (One definition of insanity is to keep
doing the same thing, the same way -- each time expecting a different
result). There is some discussion of actuating the O.D. (using an adapter
for a zerks fitting and a hand-pump full of oil) to relieve some preload on
the. Is this what's causing my problem? I'm looking for a solution that
doesn't involve the use of my BFH. Thanks...
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Tom,
You are right about backing off the spring tension. The springs hold the
clutch in the direct (as opposed to O/D) position with enough pressure that
the clutch can withstand the full torque of the engine multiplied by the
gear ratio of the transmission. In other words it will take in excess of
200 Lb-Ft of torque to shift the splines unless you back off the spring
pressure. You will have to remove the adapter to relieve the pressure.
This is where having a spare shaft comes in handy. Inserting a shaft into
the splines before attaching the adapter will guarantee that the splines
are ligned up and they will stay that way for final assembly. I have a
spare shaft (it has buggered-up splines for the 1st-2nd gear hub) and
assembly was a breeze. This is the nice part about the J-Type vs the
A-Type.
The A-Type overdrive compresses the springs (of which there are 8) against
the back of the gearbox which means there is no spring pressure on the
clutch while you are sliding the splined shaft into the O/D. We developed
a technique where we assemble the unit from the O/D up. We made a mount to
which we bolt the output flange of the O/D unit so that the open end is
facing up. In this position gravity will hold the clutch faces in the
direct (as opposed to O/D) position. Then we drop, er, lower the gearbox
onto the O/D unit. Lowering a 100 lb cast iron Austin-Healey gearbox onto
the 20 lb O/D unit seams like the tail wagging the dog.
Well good luck and remember, there are very close tolerances in the splines
so aligning them is very critical.
Dave (been there, done that) Massey
St. Louis, MO USA
71 TR6
74 TR6
78 TR7
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