classic motorcycle forum

Motorcycle Discussions => British Bikes => Topic started by: Andy_G on January 10, 2007, 03:36:39 PM

Title: Tightening crank nut on T140
Post by: Andy_G on January 10, 2007, 03:36:39 PM

Is it acceptable to lock the crank on a Bonnie through the TDC bolt hole in the upper crankcase to torque the camshaft and crankshaft pinion nuts? If so, I guess it's ok to torque the alternator rotor nut too.

Title: Re: Tightening crank nut on T140
Post by: TBS on January 10, 2007, 05:22:40 PM

No, the best way is to use a spare crankshaft pinion. Use it to lock the pinions by meshing the teeth together, eg put it between the exhaust / inlet camshft pinion and the intermediate wheel. I've seen people trying to lock the pinions with the use of screwdrivers, lumps of metal, all sorts of bodges, but this method is perfect.

Title: Re: Tightening crank nut on T140
Post by: Andy_G on January 11, 2007, 07:32:03 AM

Thanks T, I will have to borrow an old crank pinion but it's a really good idea.