D1 V8i Transfer case gurus, need your smarts

[Boxer]

Ok, so i mentioned something about out failed attempt at putting the Disco on the 2WD dyno the other day. It bound up on us, so we gave up straight away and drove it off. I was just confused by this as I figured it was a purely mechanical transfer case and that it should operate that way. Yet having read around I figure that it has something to do with the tansfer being viscous and that it still has some drag to the front end. Anyway, although I've been getting awesome mileage this week, the car has been a little weird to drive and on a few occasions it's felt like it was in 4WD. I've stopped and started, shifting the transfer in and out of 4WD, yet it didn't do much. Then today leaving work it made a pretty big clunk coming out of the carpark. Didn't seem to have broken anything, so I drove it home very gingerly and decided tonight to pull the front 1/2 shaft out to see if it'd still drive.

In 2WD it won't budge, but in 4WD it seems ok. I figure that's just something to do with the centre diff being locked. I guess

Anyway, this isn't what I specialise in, yet I have a few ideas as to what might be wrong. I'm hoping some of the forum gurus might be able to offer some advice.

Much appreciated.

Boxer

[Lucus]

oops

[Boxer]

nah, that makes sense. can't even understand why it would have independantly spun the rear wheels though on the dyno...

Thinking about it now though, if the centre diff was screwed, it wouldn't be open wheeling un-lock and driving in lock? Is it possible to tighten these diffs by accident like some LSD diffs?




Either way, here's me... thick head, probably needing a new transfer :(

And I was hoping to put a few bucks into lifting it.

Any ideas what I'm up for with repairs?

[Boxer]

It's late and I'm talking to myself here, but I kind of wish I'd never stuck it on the dyno anyway. I was more morried about mixtures and only took it there to put the sniffer up the tailpipe. Somehow I ended up hearing the words "lets chuck it on the dyno" and next thing I knew.

[langy]

You might want to go back to the drawing board for a bit - the TC on your Disco should be the LT230 which has permanent 4wd thru a centre internal open style diff than can be locked by pushing the lever to the left. Provided the lever is on the left side, this is the same when you enter low range by pushing the lever forward.

(Sorry about the kindergarten lesson, but I figure you might have a malfunctioning diff lock light)

Whilst there might be some drag, you should have been able to at least idle on the 2wd dyno with the CDL off. Sometimes the CDL jams, and even though the lever is on the RHS, the CDL is still engaged. Getting underneath with a screwdriver or vice grips can ensure the CDL is in the off position.

If the centre diff was RS, you would not have any drive at all. I'd suspect your selector fork is slightly jammed or the lever pviot is loose (It has a plastic bush that wears and falls out).

The LT230 is pretty hardy - it's your tyres that wear if the CDL is on, and it only goes bang if you go around sharp corners on hard surfaces.

[Blknight.aus]

the VC'less CDL can do some funny things if its been let run low or spun too hard too often, the fretting will grab at shafts like a sprag clutch and you wind up with a semi permananly locked CDL....


Occasionally lifting and spinnin a wheel by hand in reverse with the CDL known to be off and the boxes in nuetral will get it free but it usually doesnt last long before it goes pear shaped again.....

I have to admit Ive never seen it in an lt230 before.

[Boxer]

Yeah, I'm 100% sure it all felt weird because it basically wound itself up like a rubber band on the dyno. Lucky it was only for a few seconds, but either way, enough to make it unhappy.

I'm gonna check a few things over the weekend, but I'm pretty sure I'll be coughing up $1500 next week (that I'm sooooo stoked about spending) for a new transfer case.

Put basically... don't try this at home kids!

[justinc]

As Dave said, the TC is NOT supposed to be driven on a 2wd Dyno at more than 10Kmh, Any more and it has probably broken/ seized a side gear in the centre diff, effectively partially/ permanently locking it. Smack the Dyno operator, and tell him NEVER do this again.

At the very least, the case will need a complete strip down and inspect/ measure to cost up a rebuild. Centre diff bits I have plenty of, if you need some. A used case may require some work anyway, so beware.

JC

[Boxer]

Not really the dyno operator's fault though. He offered, I accepted. He's a good mate and is smart enough to build IRS 8 second LS1 Commodores. Yet I'm a mechanic by trade and didn't think in the 12 months that I owned the car that is was constant 4WD.

I must had a few ml of Pajero blood in me from my old car that got stolen.

Maybe I should get a new prescription for my smart pills.

[rovercare]

Maybe I should get a new prescription for my smart pills.

Good idea

Your centre diff will be fugeyed, drop the transfer oil and have a bo peep, or just drop the centre diff out like your going to have to anyway

[justinc]

Not really the dyno operator's fault though. He offered, I accepted. He's a good mate and is smart enough to build IRS 8 second LS1 Commodores. Yet I'm a mechanic by trade and didn't think in the 12 months that I owned the car that is was constant 4WD.

I must had a few ml of Pajero blood in me from my old car that got stolen.

Maybe I should get a new prescription for my smart pills.

Good thing you know him then! :o

Just make sure he doesn't attempt this again on any LR product as they ALL require 4 wheel rolling roads . (Except series though, as they have FWH's.) Especially the Viscous transfer case models, as you can't disconnect the front shaft and run them in 'Difflock' as there isn't one.

JC

[DiscoveringAuz]

Mate,
Been there done that, apart from the Dyno part, my T case on my 95 made a simiar bang noise on full lock a few years back, ended up in a rebuild as a gear had become many many small parts, the thing is it still drove so don't take the fact it is driving as a safe sign,
two checks to do
a drain the oil check the part numbers on the pieces that come out with it
b lift a front and opposing rear wheel, spin the front wheel if they rear spins as well it's locked and the t-case needs work.

[Cap]

Hey Boxer, your a tool! Why didnt you call me mate, I could have given you a little (read a LITTLE) bit of info about this. Now, ill have to come up to Sydney and smack ya around (and borrow your bike too) :D

[justinc]

Hey Boxer, your a tool! Why didnt you call me mate, I could have given you a little (read a LITTLE) bit of info about this. Now, ill have to come up to Sydney and smack ya around (and borrow your bike too) :D

Hey Stoogey, not only do you OWN a pimps truck, you are beginning to sound lke one now:p:p:p

JC

[Scouse]

Not really the dyno operator's fault though. He offered, I accepted. He's a good mate and is smart enough to build IRS 8 second LS1 Commodores. Yet I'm a mechanic by trade and didn't think in the 12 months that I owned the car that is was constant 4WD.

Maybe I should get a new prescription for my smart pills.I happen to know a Land Rover engineer who did exactly the same thing a few years ago :eek:.



And his result was even worse :p.

[B92 8NW]

Boxer, in the future make sure the yellow button is popped up, pull the red lever back to do this.:)

My 200 Disco had an essay on the sunvisor explaining the vices of 2wd dynos. Why on earth did they get rid of that warning sticker?

[Blknight.aus]

they didnt, its in every single landrover Ive ever been in that had full time 4wd usually near the tyre placard, on the fusebox, next door to the heights placard on the drivers B pillar, on the visors in the service manual, in the owners manual AND in the workshops manuals should you have them..... some of them specifically mention it as dyno work others mention it for lift tow recoveries and all of them (when you find them) say "drop the propshaft if you want to try this"

Imagine what would have happened if youd tried it with a VC eqquiped Tcase...

:eek::eek::eek::eek:

[justinc]

they didnt, its in every single landrover Ive ever been in that had full time 4wd usually near the tyre placard, on the fusebox, next door to the heights placard on the drivers B pillar, on the visors in the service manual, in the owners manual AND in the workshops manuals should you have them..... some of them specifically mention it as dyno work others mention it for lift tow recoveries and all of them (when you find them) say "drop the propshaft if you want to try this"

Imagine what would have happened if youd tried it with a VC eqquiped Tcase...

:eek::eek::eek::eek:

Some workshop equipment or the odd employee as instant hood ornaments??:eek:


JC