A question for those in the know. I have this crank turning tool had and used it for years, but lately I’ve had a few bikes I’ve gone to use it on and the bolt won’t screw in to the threaded insert in the end of the LH crankshaft. Have Ducati changed the thread on bikes in the last few years? Eg post 2016. It’s definitely not the thread on the bolt that’s faulty, that’s the first thing I thought so cleaned it up (not that it needed it) with a die. ps. The thread on the bolt in the photo is M8 x 1.25.
I have same tool and have used it for years with no problems. Only time was on a 900ie that was very tight. I think someone had previously damaged the thread in the crank.
I just wanted to check before trying to force it in, or even run a tap into the crankshaft thread, just in case it has changed. If it were just the one bike I could put it down to someone being ham fisted before but this is the 3rd bike now
The bolt in that tool isn't quite long enough Paul. Some cranks have more of a tapered lead in the nose of the crank before the threaded section.
Most recently, a 2020 scrambler 800, a 2016 Hypermotard 939 and a 2019 Hyper 950. I did check the thread on the bolt on the tool and JIC ran a die up and down it, it’s in good fettle. I did take a regular M8 x 1.25 thread bolt and try that on the current Hyper 939 that’s on the lift but it wasn’t having any of it , less than one revolution and it begins to bind, like the thread pitch is wrong
It was the thread in the crank. I took the risk of running a tap in, the first 1.5 turns met some resistance but then after that the tap ran in and out cleanly. Now the bolt goes in and out cleanly How weird is that? To get not just one but 3 where the first turn of the thread in the crankshaft is damaged. Makes one think it could be my fault but I’m so careful and the fact it’s only on say 10% of the bikes I’ve serviced makes me think it’s not me. ps. I smothered the tap with grease JIC any swarf was produced, didn’t want it falling inside.
There's a grub screw in the crank nose to close the oil way up. It's thread locked; the hard red stuff. That will bind a thread up Glad it's sorted
