Ash.Witty Posted November 17, 2013 Share Posted November 17, 2013 Has anyone had the P.A.S. box crack on the 4 bolt plate simply just from turning lock to lock? I'm running 37" tyres but was just manoeuvring out of my workshop for the first time doing multiple lock to lock turns and it failed. Anyone got any ideas cos I'm stumped. Quote Link to comment Share on other sites More sharing options...
Nigelw Posted November 17, 2013 Share Posted November 17, 2013 Never seen it before but I do know that later PAS boxes have got an aluminium top cover with bearing inserts and the older types have a cast steel one, cold be that you have an aluminium one and turning the 37s is too much pressure for it? there is only a short length of shaft from the worm roller to the bearing but a lot of power being pushed upwards as the worm tries to rotate the wheel. Maybe a steel one would solve this but it does point out a weakness when running tyres that size!! Quote Link to comment Share on other sites More sharing options...
Ash.Witty Posted November 17, 2013 Author Share Posted November 17, 2013 I've run 38" tyres for well over a year, off roading etc. no problem it just failed whilst doing a simple million point turn. I will get a magnet on it today, didnt know that there were ally and iron tops. I would presume an iron top would be stronger and if this is an iron top then do you recon a hydro assis kit would be good to help it out when I fix it? You wouldn't have any idea when they started putting ally tops on would you? Mines a 1998 Defender. Quote Link to comment Share on other sites More sharing options...
western Posted November 17, 2013 Share Posted November 17, 2013 maybe the bolts were overtight & created a hairline crack that's just given up. Quote Link to comment Share on other sites More sharing options...
Ash.Witty Posted November 17, 2013 Author Share Posted November 17, 2013 It's done 110,000 miles so I would have thought it would have failed long ago, also I've just tested to see if its ally which it is. Next step I presume is to hunt down an iron topped box. Quote Link to comment Share on other sites More sharing options...
Maverik Posted November 17, 2013 Share Posted November 17, 2013 You should drop Adwest a mail about it... or whatever they're called now. can't remember... Quote Link to comment Share on other sites More sharing options...
Ash.Witty Posted November 17, 2013 Author Share Posted November 17, 2013 Was thinking that too, bit annoyed really but you live and learn. Quote Link to comment Share on other sites More sharing options...
Nigelw Posted November 17, 2013 Share Posted November 17, 2013 Thing is the PAS box was never meant for turning anything above 32", 7.50 was biggest tyre size from standard as far as I know, so the taller and wider they are the more stress you put on the PAS box and pop!! I have wondered previously what would be a stronger box to upgrade to in terms of handling silly sized tyres??? Quote Link to comment Share on other sites More sharing options...
Ash.Witty Posted November 17, 2013 Author Share Posted November 17, 2013 Right then as well as a new box, hydro assist must be a good move to prevent this from happening. Just spoke to someone running 37" tyre and his sheared the bolts holding the plate down. Quote Link to comment Share on other sites More sharing options...
Diesel_90 Posted November 17, 2013 Share Posted November 17, 2013 I've twisted two mainshafts but have never had any problems on the top of the box. Strange. I'm currently running a good second hand discovery box. When this fails I will fit a Gwyn Lewis hydro assist kit. I have found discovery boxes are easier to find in good condition as they have mostly done road miles. Quote Link to comment Share on other sites More sharing options...
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