darthdicky Posted March 6, 2016 Share Posted March 6, 2016 I've got a QT diff guard which I'd like to fit again, but have lost the bolt that fits underneath the diff nose. It seems these are a strange thread which changed partway through production and as such, I've got no idea what I need. I've ended up with 2 lots of bolts that all seem the same, the latest ones with part number SH406062. These don't fit my diff which I think is quite an early one, they're too big. Can anyone confirm what the part number or size and thread I need for an early diff, and where I can get them at reasonable cost? Thanks, Richard Quote Link to comment Share on other sites More sharing options...
Paul Woodward Posted March 6, 2016 Share Posted March 6, 2016 They were 3/8 BSF in my diff. http://www.ebay.co.uk/itm/BSF-Zinc-Plated-Steel-8-8-Grade-5-Hexagon-Head-Bolts-Set-Screws-1-4-To-1-2-/291190441467?var=&hash=item43cc4d85fb:m:mBTUZX7x8s52QWGSP0_1iMQ Quote Link to comment Share on other sites More sharing options...
western Posted March 6, 2016 Share Posted March 6, 2016 my 110 up to 1986 parts book shows bolt SH406061 for the diff nose http://www.lrseries.com/shop/product/listing/14359/SH406061L-BOLT-HEX-HEAD-3-8-BSF-X-5-8.html?search=SH406061&page=1BOLT HEX HEAD 3/8inch BSF x 5/8inch Quote Link to comment Share on other sites More sharing options...
Lewis Posted March 6, 2016 Share Posted March 6, 2016 I helicoiled mine to M10, seems easier than messing about with obscure threads Quote Link to comment Share on other sites More sharing options...
mmgemini Posted March 7, 2016 Share Posted March 7, 2016 My 1995/6 110 has 3/ 8 BSF in the front diff. BSF is not and never has been an obscure thread. 1 Quote Link to comment Share on other sites More sharing options...
Lewis Posted March 7, 2016 Share Posted March 7, 2016 Is it my garage Quote Link to comment Share on other sites More sharing options...
HoSS Posted March 8, 2016 Share Posted March 8, 2016 I helicoiled mine to M10, seems easier than messing about with obscure threads There's a reason the designers used a fine thread. Fine bolts have higher tension and shear strength and are less likely to loosen. I find it bizzare advice to weaken the design rather than just find the right bolt. Quote Link to comment Share on other sites More sharing options...
western Posted March 8, 2016 Share Posted March 8, 2016 Found my front diff trackrod guard in garage while looking for another item, happy to pass it complete with bolts if you need it. Quote Link to comment Share on other sites More sharing options...
mickeyw Posted March 8, 2016 Share Posted March 8, 2016 This must be a hangover from the Series days. Engines were UNC & UNF threads, while axles and transmissions were BSF & Whitworth IIRC, BSF is pretty obscure nowadays over here, although I daresay the good ol' US of A may still be using them. I was quite surprised to see them in Paul's link above. Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted March 8, 2016 Share Posted March 8, 2016 I've done the same as Lewis in the past on more than one occasion and helicoiled them to M10x1.5. Never had a problem with them coming loose. Just my experience. Mo Quote Link to comment Share on other sites More sharing options...
GW8IZR Posted March 8, 2016 Share Posted March 8, 2016 There must be plenty Discovery 1 steering damper brackets still on diffs languishing on salvage yard floors / spares bits boxes. For the job in question, helicoil or correct bolt wont make a scrap of difference really Quote Link to comment Share on other sites More sharing options...
mmgemini Posted March 8, 2016 Share Posted March 8, 2016 This must be a hangover from the Series days. Engines were UNC & UNF threads, while axles and transmissions were BSF & Whitworth IIRC, BSF is pretty obscure nowadays over here, although I daresay the good ol' US of A may still be using them. I was quite surprised to see them in Paul's link above. Series one's had Whitwoth threads IIRC.certainly the prop bolts were Whit because the heads of the bolts were held in place by the shoulder of the diff flange. I don't remember when they went to BSF, remember the BSF bolts had the smaller heads. As for the US of A. They were using SAE threads on the lend lease stuff of WW2. That's one of the reasons I had to buy AF spanners. The 1930's Morris cars had Morris made Hotchiss engines fitted which had metric threads BUT with Whitworth size nuts and bolt heads. I still have some BSF brake unions Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted March 8, 2016 Share Posted March 8, 2016 And early Morris Minor's (the Issigonis version) had BSF/BSW on the chassis/body, and due to buying a load of french machinery, a mixture of UNC,UNF and yes, even metric on the engine, but not every one of them And you lot think Land Rover is bad? BTW, I seem to remember that the Defender/RRC/Disco propshaft bolts remained Whitworth, this is why a 14mm spanner is a really tight fit on them(should be 9/16"). Quote Link to comment Share on other sites More sharing options...
mmgemini Posted March 8, 2016 Share Posted March 8, 2016 Sorry Bowie the Defender prop bolts and nuts are 3/ 8 UNF. Bolts are dealer only Quote Link to comment Share on other sites More sharing options...
GBMUD Posted March 8, 2016 Share Posted March 8, 2016 Looks complicated to me Dicky. In view of this, and if it is a rear QT diff guard, please just post it to me and stop worrying about it. Chris Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted March 8, 2016 Share Posted March 8, 2016 Ok, close, I guess:) Quote Link to comment Share on other sites More sharing options...
darthdicky Posted March 31, 2016 Author Share Posted March 31, 2016 Cheers for the thoughts all, as I've got a collection of what should be the right bolts I'm starting to wonder whether the rear axle on there is an mid-80's Range Rover one, if they were any different? One thing I haven't tried is swapping a bolt from the front guard to the back, I might give that a go this weekend as that'll show whether it's different to a Defender/Disco one. I'm sure the right sized bolts will be cheaper than a Helicoil, I just need to figure out what the right sized bolt is! Richard Quote Link to comment Share on other sites More sharing options...
western Posted April 1, 2016 Share Posted April 1, 2016 1986 to '91 RR have a harmonic damper not a steering rod guard on front diff as in this parts diagram, http://lrcat.com/#38/4/48914 bolts are item 11 BH406101L -- Bolt, 3/8 UNC x 1&1/4 inch Quote Link to comment Share on other sites More sharing options...
darthdicky Posted April 1, 2016 Author Share Posted April 1, 2016 Thanks Ralph but I think that's the same one as I've got already. How about the rear axle, were the bolts under the diff nose any different on those? Richard Quote Link to comment Share on other sites More sharing options...
Nigelw Posted April 1, 2016 Share Posted April 1, 2016 I picked up front and rear diff guards second hand on Tuesday, the front will replace the NVH damper and use those bolts but I will check them in the back when they are out. This thread clears the water by muddying it up further lol Quote Link to comment Share on other sites More sharing options...
western Posted April 2, 2016 Share Posted April 2, 2016 Thanks Ralph but I think that's the same one as I've got already. How about the rear axle, were the bolts under the diff nose any different on those? Richard doesn't show any bolts in that position for rear axle diff case. http://www.allbrit.de/UNI.cfm?PAGE=776240&SPRACHE=EN Quote Link to comment Share on other sites More sharing options...
Nigelw Posted April 2, 2016 Share Posted April 2, 2016 Standing in keith Gotts today I picked up my UJ's and nuts along with the 3/8 x 5/8 BSF bolts that fit my rear diff perfectly. Quote Link to comment Share on other sites More sharing options...
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