Ray Frazier wrote:
> My understanding is that in our brit cars the lay shaft is not lubricated
> when the car is towed. the lubrication to this shaft is usually caused by
> the main gears carrying it up to the lay shaft. when the car is towed with
> the driveshaft in place the lay shaft turns but the bearings are not
> lubricated.
Well, shoot, you got it just about all ass backwords.
The layshaft is permanently geared to the input shaft of the transmission. Also,
the laygear is mounted below the mainshaft and is about half submerged in oil.
The spinning of the laygear is the only thing that lubricates the transmission
and it spalshes a virtural torrent of oil throughout the tranny. It's a good
system, with the engine running, as it assures oil is being pushed around the
tranny with some authority -- as long as the input shaft is spinning.
The output shaft of the tranny has the 1st through 3rd intermediate gears. These
gears usually freewheel unless a gear is selected. However, when towing, the
input shaft is stationary, the laygear is stationary, and the intermedite gears
are all stationary. The only thing that is spinning is the output shaft in the
transmission and there will be no replinishment of oil between the shaft,
bearings, and the intermediate gears.
You will end up with a perfectly good transmission -- fine layger, good
synchros, and all the intermedate gear bushes will be toast. This is very
expensive and some of the stuff can't even be purchased anymore.
So DO NOT tow a manual transmission for any distance without the driveshaft
being
disconnected.
--
Bob Allen, Kansas City, '69CGT, '75TR6, '61Elva(?)
"We had to stop going to orgies. Too many thank you notes to write."
|