Home > Td5 > Td5 Diff Lock won't Disengage |
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nosnibod Member Since: 15 Aug 2007 Location: West Midlands Posts: 370 |
It looks like item 34 has been fitted upside down if you compare the photo against the diagram... Dave
Green Goddess - 1998 Defender 110 300tdi |
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3rd Apr 2018 7:07am |
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VVS210 Member Since: 12 Nov 2016 Location: Hampshire Posts: 953 |
Brilliant! - i had exactly the same problem back in the winter, hardly ever use diff lock but needed it off road & then couldn't disengage. Eventually got it off with a lot of wiggling the selector lever & haven't used it since. Now I have an insight into what to look for when it dries up enough for me to start crawling around on the ground with the spanners
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3rd Apr 2018 8:01am |
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Caterham Member Since: 06 Nov 2008 Location: Birmingham Posts: 6298 |
/\ definitely one of the potential problems although looking really carefully I think it is actually fitted the correct way round? ie the plate (item 34) should bend upwards away from the transfer box.
my 'itch' that took 7 years to find / resolve was related to the lever / linkage. effectively I'd move the lever into unlock but it was not quite achieving the full movement on the item 34 so although we tested it always showed as being in the unlocked position. anyhow the resolution was to loosen the bolts fixing the levers to the gearbox and move the assembly as far as possible (to the left if I recall) which meant the linkages moved item 34 that little bit further and just enough to fully push item 34 into the unlocked position where it would stay. there's an obvious click when it fully moves into the unlock position. if the above is the issue the short term fix is to remove the 'staple' that links 34 to the lever / linkage and see if you can manually push item 34 into the unlock position and leave it there for a few days to see if all is ok. good luck. (and I hope above makes sense). |
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3rd Apr 2018 8:13am |
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blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17392 |
Don't forget that if you are ever in the situation where you really can't disengage 4wd you can remove the front propshaft and drive quite safely with rear wheel drive only.
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3rd Apr 2018 8:55am |
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Intercept Member Since: 27 Feb 2017 Location: Suffolk Posts: 587 |
Thanks everyone.
It is hard to see in the photo but it does bend upwards as per the diagram. Maybe another potential fix would be to remove it and bend it upwards by another 3mm.
That could also be an option because the pivot of the 12" vertical link (with the "staple" at the bottom) has a thread and locknut arrangement to move the pivot horizontally.
True. I pondered removing a prop but couldn't remember which one! |
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3rd Apr 2018 10:06am |
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Caterham Member Since: 06 Nov 2008 Location: Birmingham Posts: 6298 |
I have a tdci which I believe is a slightly different arrangement in so much that there isn't an actual means of adjustment.
my suggestion would be to remove the 'staple' and see if you can manually shift it at the transfer box into the unlocked position. if so you've pretty much found the issue. |
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3rd Apr 2018 10:13am |
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Intercept Member Since: 27 Feb 2017 Location: Suffolk Posts: 587 |
I can disengage it without removing the staple - just easing it upwards whilst moving the spanner in the photo is enough to get the T box to reach the unlocked detent.
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3rd Apr 2018 10:16am |
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Caterham Member Since: 06 Nov 2008 Location: Birmingham Posts: 6298 |
aha.
so as it would appear in the photo. you need to lift it over the bolt head and hence that's what the problem is? question - why has it become a problem (what changed)? a few things to consider; add a washer below item 34 to lift it over, replace hex head bolt with dome head, insert a spring over the 'staple' / along the staple between item 35 and the other end adjoining to main linkage which should lift the spring up so the end of it misses the bolt head, hope you can get it sorted easily. |
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3rd Apr 2018 10:41am |
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JR Member Since: 07 Dec 2012 Location: Auchtermuchty Posts: 532 |
Whilst not doubting the reason shown at the top of this string, the more common reason for not being able to disengage the cdl is Transmission Wind Up. Wind Up is caused when the using Diff Lock when conditions may not fully need it and the rear wheels, which will take a shorter arc when cornering, are forced to turn faster/further than the actual line the wheels take; this is because the cdl locks the drive between front and rear and the front is prioritised due to the weight on these lead wheels. If you've wound the transmission up going forward then you need to try unwinding it by reversing. Many try reversing a few feet, I've often had to reverse 150m or more before it disengages! We've also found that reversing on full left lock can often help.... |
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3rd Apr 2018 10:48am |
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blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17392 |
It actually doesn't matter, either will do, but from personal experience I can say that the handling is a bit peculiar with front wheel drive (rear prop removed) but is reasonably normal and predictable with rear wheel drive only (front prop removed). The other consideration is that with the rear prop removed you will only have a handbrake if the difflock remains engaged or the vehicle is in gear. Disengaged the difflock and take it out of gear and it will run away even if the handbrake is hard on. For this reason I would always recommend removing the front not the rear. If you want a real surprise, try removing the rear prop, leaving the difflock disengaged and the handbrake hard on, and try driving off. You may be surprised at what happens! (Do not drive any distance though because you'll destroy the rather fragile centre diff). |
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3rd Apr 2018 11:22am |
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