oneandtwo Posted November 14, 2019 Share Posted November 14, 2019 Currently rebuilding my transfer box with 1.2Q gears, sleeved casing etc. On stripping the centre diff down, the bronze washers for the planetary gears had disintegrated and the gears had worn themselves into the housing. I then stripped two more LT230 centre diff which still had the washers intact however there is slight wear in the housings of both of them still - photos attached below. How much, if any wear is acceptable? (anyone got a decent housing spare for sale?) or do I just buy an Ashcroft ATB and be done with it? Quote Link to comment Share on other sites More sharing options...
Team Idris Posted November 15, 2019 Share Posted November 15, 2019 As a plant and agri fitter I can say that the planet and sun gears have a clearance and it is usually way bigger than in a gearbox or on the crown wheel and pinion. I’ve seen a ZF duetze tractor diff where the sun and planet bevel gear teeth were a fine cast finish with no machining. So these aren’t as critical a part as many other gears in a truck/car/tractor. I would reassemble one of the better housings. What kills them is spinning the front wheels. They don’t turn much against themselves on the road. To blow the thrust washers a driver must have doing tight turns by applying the handbrake? They hate that. 1 Quote Link to comment Share on other sites More sharing options...
Sigi_H Posted November 15, 2019 Share Posted November 15, 2019 Years ago I had contact to Dave from Ashcroft. He told me, that they use cases like that. I had it for 180.000 km in my LT230. He was right. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted November 15, 2019 Share Posted November 15, 2019 5 hours ago, Team Idris said: What kills them is spinning the front wheels. They don’t turn much against themselves on the road. To blow the thrust washers a driver must have doing tight turns by applying the handbrake? They hate that. Yep, one good way to kill any diff is spinning one end really fast as the planet gears are only there to allow a small difference whilst turning, not cope with huge speeds / loads. Quote Link to comment Share on other sites More sharing options...
Snagger Posted November 15, 2019 Share Posted November 15, 2019 I read the same, about spinning up the diff, possibly on here, and that is something the ATB eliminates. Quote Link to comment Share on other sites More sharing options...
Sigi_H Posted November 15, 2019 Share Posted November 15, 2019 Engage the Diff lock, when it is possible and not, when you feel it is necessary. This will save the thrust washers. It is possible, when the surface is slippery and the tires can eliminate differences in revs 1 Quote Link to comment Share on other sites More sharing options...
oneandtwo Posted November 15, 2019 Author Share Posted November 15, 2019 None of the damage is my doing! - These all came out of 300tdi defenders and discos that I have scrapped over the years, no idea of the history of them! Quote Link to comment Share on other sites More sharing options...
Peaklander Posted January 7, 2022 Share Posted January 7, 2022 Thread revival 🙂 What did you decide to do with the case(s)? Did you fit an ATB? I am about to embark on the road to a centre ATB I think. Quote Link to comment Share on other sites More sharing options...
oneandtwo Posted January 11, 2022 Author Share Posted January 11, 2022 I scrapped a 1996 discovery ES shortly after. I pulled the transfer box off and found it had been fitted with a LT230Q out of a late Disco2 with the later centre diff housing and reinforced casing. Stripped it apart to inspect it and it was like brand new, diff was unmarked, so I rebuilt that box instead, had the casing sleeved, fitted a Syncro gearboxes hardened intermediate shaft. Centre diff I rebuilt with Ashcroft 4 pin centre and set up correctly (notchy). It is completely leak free still and very tight in use. Quote Link to comment Share on other sites More sharing options...
Peaklander Posted January 11, 2022 Share Posted January 11, 2022 (edited) 5 minutes ago, oneandtwo said: had the casing sleeved Thank you for the reply. Sleeving is something I have read about but not enough to see what it is referring to. What is being sleeved? Edit: why did you go for the Syncro shaft? Is it cheaper or better than Ashcroft's? Edited January 11, 2022 by Peaklander Quote Link to comment Share on other sites More sharing options...
oneandtwo Posted January 12, 2022 Author Share Posted January 12, 2022 The intermediate shaft hole in the casing is sleeved with stainless insert as the hole wears causing oil leak. Every transfer box I stripped (at least ten) has had a worn hole, either grooved or ovalised. The Syncro intermediate shaft is a direct replacement for the standard intermediate shaft, but made from hardened steel - again all the boxes I stripped down have had wear to the intermediate shaft. Syncro were the only people at the time who produced an uprated shaft. the Ashcroft 4 pin diff centre is an uprated stronger one piece centre to replace the weaker standard two pins. On my Puma LT230 I recently rebuilt I did exactly the same except I also fitted stronger TAS manufactured machined centre gears but that is probably overkill! I also replaced all the bolts with 12.9 cap heads on both boxes. There is a photo on this page - 1 1 Quote Link to comment Share on other sites More sharing options...
Peaklander Posted January 12, 2022 Share Posted January 12, 2022 14 hours ago, oneandtwo said: The intermediate shaft hole in the casing is sleeved with stainless insert Yep Ok I see now thanks. Looking at the Ashcroft re-build parts for the LT230 I can see that they supply the steel bush for diy sleeving but also do an exchange case with the bush pressed in. Quote Link to comment Share on other sites More sharing options...
reb78 Posted January 12, 2022 Share Posted January 12, 2022 @vulcan bomber on here can sleeve them for you. He did mine. 1 1 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.