Tim,Are you sure its the diff not the trans? One more thing to look at only if
you have an overdrive - my overdrive caused exactly that symptom once when the
actuator pressure didn't leak down properly due to swarf in the tiny bleed
passage. It stuck in overdrive which caused the one-way-forward over-ride
clutch to engage. The driveshaft then refused to rotate in reverse. It rotated
forward freely but was capable of holding off considerable reverse torque as it
drove the small rollers up their ramps tighter against the clutch. Problem
would go away in a few minutes as the oil bled down.
The same could also happen if the OD lever is a little off and the OD valve is
constantly engaged with the solenoid off.
If the car's in the air you can run the engine to build pressure and manually
toggle the overdrive lever to assure it clunks in and clunks out.
Hope that helps.
Gary Schneider
From: timmmurphh--- via Fot <fot at autox.team.net>
To: fot at autox.team.net
Sent: Monday, September 11, 2017 10:11 AM
Subject: [Fot] Urgent! TR4 Detroit Locker problem, locks wheels going backwards
<!--#yiv9794498143 _filtered #yiv9794498143 {font-family:"Cambria
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1.0in 1.0in 1.0in;}#yiv9794498143 div.yiv9794498143WordSection1 {}-->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_______________________________________________
fot at autox.team.net
http://www.fot-racing.com
Archive: http://www.team.net/archive
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