Rear Hub Nut Conundrum - Solved

[matty74]

Hi all ... any help or advice greatly appreciated on this one.

Noticed that my rear Hub nuts had seen better days, so I thought I’d order some new ones in readiness the coming season, It’s a 1970 bus with 15” Wide 5’s.

They arrived (46mm AF M30 thread) but the New thread size was too big, which I thought was a bit odd as the old nuts were 46mm AF. So I ordered the 36mm AF M24 type but these were too small ... don’t understand what stub axle I’ve actually got on there. I’ve measured across the thread and it looks about 26mm?

I’m really confused and have ordered an M26 x 1.5 febi Hub Nut just to verify the thread size as I’m not entirely happy with the state of the thread on the existing OSR Nut.

Old Nut is on the right


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[Happystamps]

Bit of a long URL:

Get yourself some verniers. You can measure the OD and ID of the old nut, and work out exactly what size you need. Honestly, they're really handy for an enormous amount of jobs.

https://www.screwfix.com/p/c-k-vernier-calipers/7816X?kpid=7816X&ds_kid=92700030952055947&ds_rl=1245250&ds_rl=1249481&ds_rl=1249796&gclid=CjwKCAjwk9HWBRApEiwA6mKWaU-1TpcjSFZj03HhhM9Qj_fvNutg976CS4Z_QWw5zEADOQST5qcDrRoCFAAQAvD_BwE&gclsrc=aw.ds&dclid=CJqjk4vEvtoCFctxGwoda1QL4w

Edit- although those ones have a bad review, so maybe shop around. You don't need anything amazing though for this sort of work. 0.1mm accuracy is fine for 99% of jobs.

Also- looks like you've eaten into the old nut- how are your wheel bearings?

 

[matty74]

Thanks for that [emoji106]

Here’s the thing ... turns out (bearing in mind this is my first camper and I’ve only had it 2yrs, so still a novice [emoji85]) the o/s stub axle, at some stage of its life, has been rethreaded down to M27 x 1.5 (possibly as a result of the M30 thread being shagged at some stage) ... there’s evidence of this on the n/s stub axle too, just as the very end, bit, they must’ve changed their minds about matching both sides up (guess work I know, but I’m trying to fathom out the reasoning) the castle nut slots had then been bent in to give some bite (shocking I know) resulting in the nut being pretty much held in place by the split pin.

My van is pre August 1970, so the longer stub axle (I’ve managed to source one from USA) ... in the meantime I’ve cleaned up the thread with a M27 die and had a M27 castle nut trimmed down so that the slots line up with the split pin hole.

I’ll do the bearings when the replacement arrives, although I think they’re ok.

Chewed up Nut

M27 trimmed nut

Back On

Tighter than ever (me stood on an 18” set of stillsons is about 300lb/ft)

MOT tomorrow [emoji106]


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