I want to say that Robert is correct, there isn't any mechanical
connection to spin the layshaft with the engine stopped, and trans in
neutral. It will spin, however. I don't believe I've ever seen a box
loose enough to not spin the input shaft when the output is spun, and I
still don't believe towing will hurt. But I do rebuild transmissions!
(wink)
I've also tow-dollied cars to Ohio from Alabama with no damage, but you
should certainly all do as you think best.
BTW Robert, I believe I have an early crank around if you want to go
that route instead of a late crank..... let me know if you are
interested, and I'll have it checked.
Jim
----- Original Message -----
From: "Robert M. Lang" <lang@isis.mit.edu>
To: "William Whitmoyer" <wwhitmoyer@samsonite.net>
Cc: <6pack@autox.team.net>
Sent: Tuesday, March 05, 2002 3:13 PM
Subject: Re: TOW Bars
> Hi,
>
> All you folks that advocate flat towing your TR Triumphs - would you
> happen to be in the business of rebuiding Triumph gearboxes???
>
> Just curious.
>
> As Mark B. stated, if you flat tow the thing, you need to do something
to
> get the input shaft spinning while you tow to apply oil to the rest of
the
> gears. If you don't do this, the brass bushings will get pretty hot
> (depending on how far you intend to tow the car) or they will fail.
>
> I suppose you could try over filling the gearbox, but having had a few
of
> these puppies apart, I can't see the logic that allows you to conclude
> that the gear oil can move around in the gearbox when the car is in
> neutral... it just ain't so. And without the input shaft spinning
stuff
> around in there, the oil level is below the mainshaft centerline -
hence
> no oil to the bushings.
>
> As stated in one reply "the layshaft gears always spin". This is
correct
> only if there is power applied to the input shaft. As a test, hold the
> input shaft of your tranny, shift it into neutral. Try turning the
> tailshaft. You feel some drag on the input shaft, but the tail spins
> independently of the input shaft. This is because there is no
mechanical
> connection between the mainshaft gears and the layshaft. The drag you
feel
> is the bushings on the main shaft and the mainshaft spigot bearing. In
> this case, there is nothing making the mainshaft gears spin - they're
just
> along for the ride.
>
> regards,
> rml
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