Hi,
I agree that you need to make sure that the tranny isn't locked... I have seen
situations where one of the synchros "sticks" to the synchro hub and the
shifter is in neutral. You cannot spin the transmission if you select any gear
but the one that's "stuck" because in effect two gears are engaged at the same
time and "you can't do that".
The behavior of the Detroit Locker is also a mystery to me - I? installed one
in my car once and was able to determine that I had "one wheel drive". Pulled
it out that night. In fact, teh locker is still sitting on the bench if any
body is interested in it, but I won't "give" is away.
c ya,Bob Lang339-927-4489
On Monday, September 11, 2017 12:30 PM, Duncan Charlton via Fot <fot at
autox.team.net> wrote:
I researched these a few years ago because I began rebuilding a Morgan race
car that has a Detroit Locker. ?I puzzled over the behavior of the differential
until I removed the rear cover and realized what I had. ?These are better
described as a Detroit ?unlocker? since they are always locked until the one
wheel is trying to turn faster than the other ? it sounds odd, but as far as I
can tell, the inside wheel takes all the drive while the outside wheel is along
for the ride. ?If the inside one begins to slip, it seems the diff locks again
so drive goes to the outside wheel again. ?I imagine the trick is to set it up
so that it doesn?t lock/unlock constantly while cornering. ?
They are great for drag racing and apparently were designed that way to allow
easier turn-off at the end of the 1/4 mile run. ?I know of another person in
the Pacific Northwest who races a Morgan with a Detroit Locker and has no
complaints about it. ?Yours behaves like mine except for not being able to back
up.
But to your situation ? one clue is that you just put the transmission back in
the car, which suggests that even if the gearbox did not undergo disassembly it
was at probably disturbed. ?Might it be possible that the gearbox is selecting
reverse and another gear at the same time? ?I suppose the only way to check
this is to d/c the driveshaft, select reverse and see what happens when you let
out the clutch. ?No need to have the engine running ? if you select reverse
with the clutch disengaged you would normally be able to overcome the drag of
the gears to rotate the driveshaft.
Duncan
On Sep 11, 2017, at 10:02 AM, timmmurphh--- via Fot <fot at autox.team.net>
wrote:
We have a race this weekend at Elkhart Lake.? Just put engine/trans back in
car.? Test drove on road.? In trying to backup, both rear wheels are locked
solid.? Trying to reverse just stalls engine. ?Last time the car was on the
road was in May at Gingerman.? No problems.? Since then been sitting up in the
air on the lift getting ?air time? while new block being machined. ?Very
puzzling how sitting up in the air would cause diff problem.? Car now has more
?air time? on the lift than track time! ?Have taken cover off diff, everything
looks okay.? No pieces of metal.? Gear oil pretty black, has been in there
about 10 years. ?Both ring and pinion look okay. ?Put fresh Reline gear oil in
and buttoned up. ?Tried again on lift. ?Turning drive shaft (trans in neutral),
can turn both forward and backward.? Both wheels turn. ?Try in driveway, same
result, cannot backup, trying just stalls engine. ?We could get the car back on
the lift by driving forward and turning around in the cul-de-sac by the house.?
Did donuts in the cul-de-sac to see how diff reacted.? Left two nice black
marks in the donut.? Accelerated forward and the diff was unlocked because
there is just one long black streak.? I?ll have to ask Ryan how it sounded and
acted.? He was driving to do that. ?When car back on lift, same thing, both
rear wheels locked up when trying to turn backwards last night. ?We can make
diff lock and unlock by holding one wheel and turning the other wheel forward.?
Not sure about specifics, wasn?t taking notes. ?So far, we can make it work,
sometimes on the lift, by turning the driveshaft.? But once on the ground we
cannot make if work under power.? We could push the car backwards out of the
shop but once we drove forward and tried to back up the wheels were again
locked. ?Any insight or suggestions will be much appreciated.? Is this a
typical failure mode for a Detroit Locker?? Any suggestions for further
examination and testing?? The last time we drove the car back into the shop to
put up on the lift we heard a pretty loud ?clicking? noise from the diff.?
Never noticed this before but wasn?t necessarily listening for it before
either. ?Very interesting, I just tried turning the wheels with car on lift and
can turn both wheels, individually, both forward and backward, no problem.? It
is?now not locked up in the backwards direction.? When turning one side the
other side also turns?in the same direction.? It?s acting like the diff is
locked up in both directions and the wheels turn in both directions.? Last
night, the last time we tried turning the wheels backwards it was locked up.?
Maybe it only works up in the air!!!! ?Very puzzling!!? I am not at all
familiar with how the Detroit Locker works.? It was the one thing on the car we
never had to worry about.? I guess I?ll learn something now? ?Tim and Ryan
MurphyMurphy?s Law Racing? (very appropriate today!)1961 TR4 #317
BRG_______________________________________________
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