Ah...the old OD stuck, don't back-up issue! I didn't consider as I don't run
OD in the TR6 racer.
Good calls!
Glad all is well Tim!
Jeff
Sent from my iPhone
> On Sep 11, 2017, at 12:28 PM, R. John Lye via Fot <fot at autox.team.net>
> wrote:
>
> That was my first thought as well, but Gary beat me to it.
>
> John
>
>
> On Mon, 11 Sep 2017 16:59:16 +0000 (UTC), Gary Schneider via Fot wrote:
>
> 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
>
> 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 Murphy
> Murphy?s Law Racing (very appropriate today!)
> 1961 TR4 #317 BRG
> _______________________________________________
> fot at autox.team.net
>
> http://www.fot-racing.com
>
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/archive
> Forums: http://www.team.net/forums
> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/garygret at
> sbcglobal.net
>
>
>
>
> _______________________________________________
> fot at autox.team.net
>
> http://www.fot-racing.com
>
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/archive
> Forums: http://www.team.net/forums
> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/rjl at
> gt-classics.com
>
>
> _______________________________________________
> fot at autox.team.net
>
> http://www.fot-racing.com
>
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/archive
> Forums: http://www.team.net/forums
> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/jeff_durant at
> comcast.net
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://autox.team.net/pipermail/fot/attachments/20170911/5a034d59/attachment.html>
|