Looking at the vid both the filler and drain plugs are not unsubstantial. You say 'snapped'. I have an image of a sheard bolt where it shears off flush and some form of extrication engineering is called for. In your case did you have any of the plug left in the final drive and how did you remove it?
Final Drive plug
- Thread starter Deleted account 250319001
- Start date
Deleted account 250319001
Registered user
- Joined
- Sep 19, 2004
- Messages
- 6,495
- Reaction score
- 565
I damaged my plug when removing it. I used the T45 hex which is specified and been used several times before. But the plug was so soft, it literally just deformed. I managed to bang in the next size up and get it out.
My mates plug came out fine. 5 minute job, oil in etc. but doing it up it snapped the head off. Clean. Luckily there was a very shallow amount of hex left in the top of the thread, which was a mm below the surface. And he was able to bang in and screw out.
He was a lucky boy as i was convinced it would be stuck in.
I thought it was just the drain plug that was T45 and the fill plug Is 8mm hex? which is why your T bit would damage the fitting?
Deleted account 250319001
Registered user
- Joined
- Sep 19, 2004
- Messages
- 6,495
- Reaction score
- 565
Think you might have that the wrong way round, the same torque on a lubed thread will overtighten it
Edit, apologies for repetition, didn't read all the way through before launch
Good thing the filer plugs is made of a softer material otherwise some job maybe even a final drive casing to change if it wasn't. They knew that this situation would be a discussing point on UKGSer because of over tightening the plug. It is a M12 so 20Nm should not be a problem.
I'm trying to simply describe the situation.
Set torque wrench to say 20 ft ibs. Dry threads the wrench will click at 20 ft lbs. Oil the threads and it will still click at 20 ft lbs but the shear friction on the bolt threads is actually, say, at 30 ft lbs. Hence in soft metals it is either going to stretch the threads or rip them out.
My realisation on this point when fitting a tow bar to a vehicle. Quite substantial mounting bolts. If I recall about 80 ft lbs. Anyway thought I would give everything a good dose of Waxoil before assembly. Tensioning the bolts I felt something was not right but continued to try and achieve the right torque value. It was only after destroying two threads that I realised that the oil had contaminated the threads which was increasing the amount of turns on the bolt to try to achieve the required value. Fortunately I was able to Helicoil repair, fit new bolts, this time to dry threads, and all was good.
Set torque wrench to say 20 ft ibs. Dry threads the wrench will click at 20 ft lbs. Oil the threads and it will still click at 20 ft lbs but the shear friction on the bolt threads is actually, say, at 30 ft lbs. Hence in soft metals it is either going to stretch the threads or rip them out.
My realisation on this point when fitting a tow bar to a vehicle. Quite substantial mounting bolts. If I recall about 80 ft lbs. Anyway thought I would give everything a good dose of Waxoil before assembly. Tensioning the bolts I felt something was not right but continued to try and achieve the right torque value. It was only after destroying two threads that I realised that the oil had contaminated the threads which was increasing the amount of turns on the bolt to try to achieve the required value. Fortunately I was able to Helicoil repair, fit new bolts, this time to dry threads, and all was good.
Similar threads
