Part 2:
See these comments from the designer of the MGB overdrive (and gearbox and
axle) who by chance I met recently:
"As you know all oil changes viscosity with temperature, under normal
operating conditions, the Gearbox/Overdrive designer (ME!) calculates the
beam forces on all the gear teeth, all shear forces and every stress on the
shafting and bearings. In order for the mechanics to function correctly,
the oil has to be within certain viscosity parameters to withstand these
calculated forces, hence the selection of the oil viscosity range. Oil also
provides a very important function in dissipating heat which is generated in
the gearbox mechanism. It is NOT recommended to use a straight 30 grade oil,
this oil is generally used only for simple lubrication work, i.e.
carburettor dampers. All overdrives are designed to be switched in or out
with the power on or off. The change quality is worse on "over-run out" due
to the inertia forces on the clutches. You will notice that when the oil is
cold, the "shift quality" will be slightly slower and "softer" as the oil is
thicker. When the oil is hot, then the overdrive changes will be quicker and
a little more sharp. This is perfectly normal. You can "tune" the shift
quality if required but that's another story. The main vehicle drive clutch
should NOT be used when operating the overdrive. If the change quality is
that bad that when changing you have to "damp" it by feathering the
throttle, then something is wrong with the overdrive, most possibly a
sticking hydraulic valve caused by dirty oil."
PaulH.
----- Original Message -----
> http://www.quantumechanics.com/categories.php?op=newindex&catid=11
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