Reply To: JAP 2a flywheel removal

[andyfrost]

Grahame , with all due respect , when you replaced your sheared B&S key did you just hand tighten the flywheel back on , or apply the correct spec of torque , I suspect the latter. Looking at the photo of your 2A key , it seems obvious to me that it is the result of damage caused by running with an incorrectly tightened flywheel.I’m certain that if you trawl the internet for torque settings on industrial engines you will not find ONE that states a hand tight setting ….whatever that equates to in ftlbs.
By the way , the pin you mention in your Howard Gem , yet again that is not the part that is designed to shear , the four 7/16th bolts with the springs behind them on the rotor shaft tighten up against the friction plates , like every other Gem that has been made.
In this thread I’ve tried to convey you my experience with 2As , I’ve worked on countless numbers of them , pumping sets, Colwoods, Bulldog/ Bullfinches, charging sets etc etc.

Andy.