Sorry about the last post. which excluded the printout of the Laycock
service bulletin. Hugh Barber volunteered to send it in it's original
form, once I can get it to him.
Briefly, it shows the use of "regular mineral oil 30wt. for winter use,
and 20wt. for summer climates".
Herman feels that the hesitancy of the OD to engage when cold, was more
related to fluid flow, such as oil being too thick. He cautioned that
electrical connections should all be looked at before going to the task
of replacing the oil.
Herman further recommends, if it's decided to change oil, to use
automatic transmission fluid as the flushing agent. A/T can be used
without harm, for shor periods in the TR tranny and OD. If the car is
already up on jack stands, to drain the units, add in three pints of the
A/T, and run the engine with OD engaged. Use jackstands under the
trailing arms to avoid the possibility of the axle yokes banging against
the frame, when the rear wheels are turning.
After 10 minutes or so, drain it out and go to the recommended 20 or 30
wt. oil. Residual A/T fluid will not spoil the oil. (In fact, some
racers use a 10% blend of this stuff) He prefers 20W-50 in the boxes
with OD that he builds for himself and others.
Dick Taylor
|