Hybrid_From_Hell Posted October 28, 2011 Share Posted October 28, 2011 Oh Dear Megasquirt Mansions had a ARB "Dropped in" for peggin' n Fixin' n Rebuild, but its turned into a hammer house of horrors unit There are on this diff some often seen issues - worn bearings and seal dribbling, and the actual drive flange scored, all of these things are "Normal Wear" and are seen all the time, what this post is about are the things that go wrong with an ARB (RD56 unit in this case) as its interesting that just about all of the things that can go wrong have. So, the casing - SCRAP Casing has been playing lathe with a loose bolt or 3 (customer did see these) these bolts have come loose and whizzed around, nmachining the casing into - er well scrap really Pics - notice the "Good" and the "Oooo Bugger Lathed" sides Ok, not a huge problem, new case is in order Moving on the crown wheel was checked - yup theres wear, but worse is that part of the "Lathework" prob got into the CWP mesh "Bugger - but that still not a prob - have those too ........ The bolts being loose have so far wrecked the casing, and the CW&P, but the loose bolts means the CW can "Chat" and rattle back and forth, causing "Ovality" in the flange (about £75 ) additionally this movement has made the bearing turn on the end of the flange so it now falls off ! - it should be a F Tight press fit - there is a way to get over this but.... This has been going on for some while, as such its not just the flange thats gone, its ovaled the holes in the actual diff casing centre itself Worse news is these are around £180 and I don't think there are any in the country ... Oh - and the plastic xcage is cracked too, and the diff centre has worn where the CW sits and is now a loose fit, not a tight fit. Difficult to tell, but looks as though the diff ovality is older, and someone has tried (fail ) by using the wrong washer (used antirattle washers) to try to stop movement, you can see the "Slots" marks on the flange, this is not the same as the later flanged bolts and it may be that this diff was dmaged a bit, badly put together, with a bodgeroo or 3 and has just fallen aprt Its fixable - but at what cost ? - Even the 2 x ARB bits are £255 on a old ARB .....and all becuase the bolts were not done properly - I say this as if the bolts are in GOOD condition or new, the parts absolutely clean as clean, PROPER screw thread lock compound used and PROPERLY torqued up very few come undone, in fact done properly the bolts can be a nightmare to get out !! All this damage is from loose bolts - so next time you have you ARB out CHECK THEM - you have been warned In the meantime we have to work out a financially sane way of repairing this ................ Nige Quote Link to comment Share on other sites More sharing options...
Tom1809 Posted October 28, 2011 Share Posted October 28, 2011 Oooo er sounds like a very expensive mistake. Quote Link to comment Share on other sites More sharing options...
CwazyWabbit Posted October 28, 2011 Share Posted October 28, 2011 Could the oval holes be bored out for larger bolts? Or would that weaken it too much? Quote Link to comment Share on other sites More sharing options...
elbekko Posted October 28, 2011 Share Posted October 28, 2011 Sounds like a new Ashcroft locker may be cheaper than fixing it... Quote Link to comment Share on other sites More sharing options...
Hybrid_From_Hell Posted October 28, 2011 Author Share Posted October 28, 2011 Could the oval holes be bored out for larger bolts? Or would that weaken it too much? Bolt size is driven (no pun intended ) by the CW as that is what this lot bolts into Nige Quote Link to comment Share on other sites More sharing options...
CwazyWabbit Posted October 28, 2011 Share Posted October 28, 2011 Good point! I obviously didn't think that one through Quote Link to comment Share on other sites More sharing options...
CwazyWabbit Posted October 28, 2011 Share Posted October 28, 2011 I suppose boring and sleeving might get around it ..... but not really something to try on a customers diff as unproven and your time may well make it uneconomical anyway. Quote Link to comment Share on other sites More sharing options...
calle-fas Posted October 29, 2011 Share Posted October 29, 2011 Bugger i just filled up my rear axle after re-shimming (10 mm a.k.a. HFH style) it. What torque should be used for the CW bolts on an ARB'd Salisbury? Quote Link to comment Share on other sites More sharing options...
robhybrid Posted October 29, 2011 Share Posted October 29, 2011 Nige give Gwyn Lewis a ring on Monday morning he bought a job lot of returns a couple of months ago, He might have some spare parts. Quote Link to comment Share on other sites More sharing options...
tiddler Posted October 29, 2011 Share Posted October 29, 2011 Very interesting! As an aside, should this thread be more accurately titled " Poor diff assembly technique woes - the perils of bodging stuff when you don't know what you're doing" ? As it is it the title suggests a sleight on ARB build quality in general. The problems described could apply to any poorly assembled differential and are surely not a generic symptom suffered by ARB units. Tiddler Quote Link to comment Share on other sites More sharing options...
Daan Posted October 29, 2011 Share Posted October 29, 2011 I dont think it neccesarrily is bad assembly, Mine (and many others) have come undone in the past despite maintaining the correct torques. Out of interest what is the threadsize used in the crownwheel of this diff? Daan Quote Link to comment Share on other sites More sharing options...
Hybrid_From_Hell Posted October 29, 2011 Author Share Posted October 29, 2011 Without Checking pretty sure they will be 3/8 UNF thread Need to squeak with Steve (and Owner) about idea to get 'one last life re-build' from the £250 of ovaled Bits Nige Quote Link to comment Share on other sites More sharing options...
Soren Frimodt Posted October 29, 2011 Share Posted October 29, 2011 Yep! Seen the exact same happen earlier this year, we noticed it because the locker would not unlock. All the same bits was damaged equally to this. Assembled by probably the best renowned company in Denmark! Quote Link to comment Share on other sites More sharing options...
Off Road Toad Posted October 30, 2011 Share Posted October 30, 2011 Back en Angleterre now Nige, will call you tomorrow. By the way is 'Ovality' even a proper word? Steve Quote Link to comment Share on other sites More sharing options...
landroversforever Posted October 30, 2011 Share Posted October 30, 2011 Nige, you are free to make up your own definition! http://www.urbandictionary.com/define.php?term=Ovality Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted October 31, 2011 Share Posted October 31, 2011 http://dictionary.reference.com/browse/ovality Quote Link to comment Share on other sites More sharing options...
Hybrid_From_Hell Posted October 31, 2011 Author Share Posted October 31, 2011 It will need Steves magic "Bodgificationing" done to it Nige Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted November 1, 2011 Share Posted November 1, 2011 I've been here Mo Quote Link to comment Share on other sites More sharing options...
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