rhydgte Posted June 16, 2008 Share Posted June 16, 2008 Hi have had a search about and couldn't find much, just wondering if the problem I'm currently having with my disco is down to this 'viscous coupling'? Basically when maneuvering at low speeds in reverse and forwards at full lock it's as if I'm applying the brakes/something holding it back... Also I have a horrific grinding/metal on metal sound coming from under the front seat area/ drivers side when steering to the right (I've put this down to a knackered CV Joint at the moment and have ordered a replacement) If the VC has seen better days are they easy to replace? Just after some opinions on this - many thanks Quote Link to comment Share on other sites More sharing options...
K88 MUD Posted June 16, 2008 Share Posted June 16, 2008 Sounds like its stuck in diff lock Quote Link to comment Share on other sites More sharing options...
rhydgte Posted June 16, 2008 Author Share Posted June 16, 2008 Sounds like its stuck in diff lock Possibly - The diff lock switch is faulty (tested it once removed) and the switch had been disconnected by previous owner hence I have no light on the dash... Have driven it approx 300miles without it going bang though, and the noise only started this week on my way home from off roading but the problem with going forwards on back at full lock has been there since I bought it couple of months ago.. Quote Link to comment Share on other sites More sharing options...
paintman Posted June 16, 2008 Share Posted June 16, 2008 Does your transfer box lever move only backwards & forwards to select H-N-L or does it move sideways to engage difflock? (looks like a figure 8 on the knob) If it moves sideways to engage difflock then you don't have a viscous coupling. I know the vc is used in the RR Classic & the RR P38 with the Borg Warner transfer box & the Freelander has its own, but I thought the Discos all used the LT230 variant transfer box which doesn't have a vc. Quote Link to comment Share on other sites More sharing options...
rhydgte Posted June 16, 2008 Author Share Posted June 16, 2008 Does your transfer box lever move only backwards & forwards to select H-N-L or does it move sideways to engage difflock? (looks like a figure 8 on the knob)If it moves sideways to engage difflock then you don't have a viscous coupling. I know the vc is used in the RR Classic & the RR P38 & the Freelander has its own, but was it ever used in standard boxes in the Disco? Ahh right so it doesn't have a VC! Yes it has manual diff lock lever - I've done a fair bit of off roading over the years but never had these issue's before! The lever works fine, high -> low is a bit stiff but sitting in neutral play the clutch and blip the throttle a bit and it drops in after a couple of shoves, also shifts over to the left (diff lock on) and stays there - until I pull it back to the right once done with it.. Quote Link to comment Share on other sites More sharing options...
stageonesimmo Posted June 16, 2008 Share Posted June 16, 2008 I'm going with the diff-lock theory as well - may explain why it was disconnected when you bought it? Quote Link to comment Share on other sites More sharing options...
rhydgte Posted June 16, 2008 Author Share Posted June 16, 2008 Ok so if it is the case that the diff lock is stuck on does it mean new transfer box time? Quote Link to comment Share on other sites More sharing options...
stageonesimmo Posted June 16, 2008 Share Posted June 16, 2008 Nah you can just pull the centre diff out and re-build it, bit of a pain to do but can be done on your back on the drive if you need to........... Quote Link to comment Share on other sites More sharing options...
rhydgte Posted June 16, 2008 Author Share Posted June 16, 2008 Nah you can just pull the centre diff out and re-build it, bit of a pain to do but can be done on your back on the drive if you need to........... Ok mate cheers, what about all the grinding noises - surely something may well be broken!? Quote Link to comment Share on other sites More sharing options...
stageonesimmo Posted June 16, 2008 Share Posted June 16, 2008 Yep, hence needing to pull the centre diff out and replace it - IF it's that thats broken it may have chomped a CV joint as they hate being stuck in difflock as well - difficult to say really - you need to get the switch fixed and get it out of diff-lock for 100% certain first then go from there...... Quote Link to comment Share on other sites More sharing options...
K88 MUD Posted June 17, 2008 Share Posted June 17, 2008 Jack one wheel up off the floor......if the diff lock is stuck in then you wont be able to turn the wheel. Quote Link to comment Share on other sites More sharing options...
rhydgte Posted June 17, 2008 Author Share Posted June 17, 2008 Ok guys cheers for all your help - I'll let you know what I find! Quote Link to comment Share on other sites More sharing options...
JimAttrill Posted June 17, 2008 Share Posted June 17, 2008 If the centre diff is stuffed you may be able to turn the wheel by hand, but it will drive off the jack if you try to do so. On the other hand maybe it won't if the diff is completely broken. The diff sometimes sort of half fails with strange results. Quote Link to comment Share on other sites More sharing options...
stageonesimmo Posted June 17, 2008 Share Posted June 17, 2008 I'll second that - the centre diff blew itself up on my Stage One at one point and the symptoms would come and go - then when I finally stripped it I found out why - a massive chunk of one of the planet gears was roaming about getting stuck in a hole in the diff case every now and then giving me drive back then it would move and I'd loose drive again - it drove me mad until I finally found out what it was! Quote Link to comment Share on other sites More sharing options...
Escape Posted June 18, 2008 Share Posted June 18, 2008 Jack one wheel up off the floor......if the diff lock is stuck in then you wont be able to turn the wheel. Don't forget to put the gearbox and/or transfer box in neutral. Quote Link to comment Share on other sites More sharing options...
rhydgte Posted June 19, 2008 Author Share Posted June 19, 2008 Update.. Have done the 'diff lock check' (by jacking one wheel off the floor and seeing if it'll turn) and on the rear axle the wheel turns with diff lock off and doesnt turn with diff lock on (as it should be?!) However on the front axle the wheel is solid either way, so from this I pressume something is broken somewhere? Any ideas? Many thanks once again P.S I have tried both front wheels (one at a time) and they're both the same... Quote Link to comment Share on other sites More sharing options...
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