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davidblythe



Member Since: 27 Apr 2019
Location: Cheam, Surrey
Posts: 110
England 
110 Rear diff damage
found 2 snapped heads and swarf when doing a rear diff oil change, stripped axle down, can see the snapped bolts on crownwheel and associated damage
Anyone have any ideas why bolts have snapped, this has been in place for 3 years and no damage on last oil change 5k miles before



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Click image to enlarge 1999 90 TD5 CSW
2006 110 TD5 HD Commercial
Post #942175 12th Feb 2022 2:29pm
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Ary



Member Since: 31 Aug 2011
Location: rua Amapa 1651 P. Alegre
Posts: 2
Brazil 2000 Defender 110 300 Tdi CSW Stornoway Grey
[list=]Hy davidblythe

IMHO it was a result of a very high torque applied to the bolts.

Best regards[/list] Ary
Defender 110
Post #942262 13th Feb 2022 12:53am
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Co1



Member Since: 19 Aug 2018
Location: North Yorkshire
Posts: 3677
United Kingdom 2013 Defender 90 Puma 2.2 HT Loire Blue
That is bizarre to see a failure in that form. I would suggest as above that they were over torqued during assembly and that the root cause of the damage was actually done back then. Would be worth checking what the others are torqued to to confirm this.
Post #942275 13th Feb 2022 7:56am
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17416
United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
I seem to remember that someone else on here reported a similar failure but at the front not long ago.

It's hard to know the cause without seem the fracture face of the two broken bolts (the loose bits are too mangled, but the threaded bits should be clear), but it is an unexpected failure.

Last edited by blackwolf on 28th Mar 2022 11:44am. Edited 1 time in total
Post #942277 13th Feb 2022 8:08am
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ashtrans
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Member Since: 08 Nov 2008
Location: Harpenden
Posts: 258
United Kingdom 
we see this failure very often on the 110 rear which it why we upped the bolt thread on our HD hypoid diff, Dave
Post #943343 21st Feb 2022 7:35pm
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MadTom



Member Since: 10 Sep 2013
Location: Olomouc
Posts: 623
Czech Republic 1999 Defender 130 Td5 HCPU Baltic Blue
A had simillar problem on fron diff of 110. And have seen it quite a lot of passenger cars with strong diesel engine. "Drobek" = The Small One - Discovery 2, "Blufínek" = The Blue Thing - Defender 130, and for me at least Ford Mondeo Smile
Post #943347 21st Feb 2022 7:57pm
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