Dale Posted May 20, 2011 Posted May 20, 2011 I don't have an original flywheel washer for my AC 912 (K301 engine.) The washer is the discontinued Kohler pn X-25-104. Last fall I made a flat washer out of 3/16" mild steel and have now sheared off another flywheel key. Is there a way of getting by without the OEM belleville? Or can anyone supply specs for the washer or sell me a couple of them. Thanks. Dalehttp://simpletractors.com/Club2/pop_preview.asp
steve-wis Posted May 21, 2011 Posted May 21, 2011 Dale, McMaster sells belleville springs, and most bearing stores do as well. Steve
Dale Posted May 21, 2011 Author Posted May 21, 2011 There were none on ebay and I'd like to get dimensional specs, at least, (o.d. ,i.d. , thickness, height) before trying to order from a hardware distributor. Thanks. Dale
TommyK Posted May 22, 2011 Posted May 22, 2011 Bellevilles cannot be easily machine shed manufactured. They have a dish to them so they act like a lock washer. They are specially heat treated so they retain their springiness. Best to salvage one, or... If McMaster has them, that'd be my suggestion too. I never would have thought the belleville washer would keep you from shearing flywheel keys. I would have figured a std washer would work in a pinch, then just torque the nut down. I figured the b.washer was there just to keep the nut from loosening. Need I mention it isn't a good idea to install a standard key made from key stock? For those unaware, an OEM Flywheel key is designed to shear if the crank shaft abruptly stops. A fly wheel key is designed to shear before the flywheel can disintegrate. If you install a standard key cut from standard bar stock between the flywheel and crank shaft, a key shearing event could either severely damage the shaft and/or worse, the flywheel could shatter, scattering shrapnel everywhere. Not to mention various and sundry internal parts trying to become external parts.
Dale Posted May 22, 2011 Author Posted May 22, 2011 I also considered that the original washer was probably heat treated. However, I decided to put a slight cup in the washer I made last year and reinstall because I need to use the tractor. I placed the washer on a a deep well socket wrench, of the same o.d. I put both in my bench vise and struck the center pretty hard through a pall peen hammer until it had about 1/16" cup in it. I've reinstalled it but haven't run the engine yet. One thing I didn't mention that preceded the key failure was that the engine had misfired violently until I replaced the ignition condenser. I noticed the sheared key when I began disassembling the engine because I was getting a piston slap. I've had it bored and installed a new piston. I hope the flywheel holds because it looks like a job just to replace that key. Thanks, Dale
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