Hi All
1275cc A+ carb cooper - I decided to change my diff from a 3.1 to 3.44 & wish I hadn't bothered.
All was well & good until I bolted the crown wheel to the diff case & realised the fibre washer was still stuck to the oid crown wheel - doh!
So I removed it again & then when I torqued the bolts (60b ft-seems a lot for what it is) one of them has pulled a thread. The bolt is fine, its the casing thread thats gone. No idea why, I'm confident my torque wrench is accurate & its the first time I ever this happened (with a torque wrench).I can only think its fatigued after 3 refits.
Options I can think of are,
1) Ive re tapped & could torque to a lesser value with thread lock. Others would be torqued to spec.
2) Fit a longer bolt - std are 3/4" long & I could fit 1" & maybe 1 1/4"
3) Helicoil with an M10 bolt.
The last option is to scrap the case & start again (I'm not keen on that idea)
While I'm on, I fitted lock tabs but not keen as the bolts bite & leave metal shards. I have read on here some people now use threadlock
Any views on the option or any other ideas.
Alan