Hi
Any thoughts on crankshaft thread protrusion beyond the bladeholder nut on a V144 with a Mark 3 engine?
Resorted to grinding off the nut due to the crankshaft thread damage protuding below the nut. There wasn�t enough to re-thread but was enough to prevent removing the rusted-on nut using the normal tricks.
The tapered sleeve is 1� x 1-1/4� (25 x 30) and I assume is the standard EN70883B with a non-reinforced bladeholder CA09203B. The crankshaft ends below the bottom level of the bladeholder and therefore the exposed thread receives the brunt on any rough patch rather than the nut, blades or bladeholder.
A Mark Two engine with a different tapered sleeve and bladeholder has no thread protruding. I assume both the Mark Two and Mark 3 have the same crankshaft, thread lenght and taper etc, so it�s just the designed combination of this sleeve, bladeholder, washer and nut that are the cause of the problem.
I imagine just adding a flat washer/s under the recessed nut may effect the Belleville washer and possibly allow the disc to spin. Wonder if some shim brass in the sleeve was worth considering?
Any thoughts on how to protect the thread, other than not to use a �Utility� to mow on rough patches, would be appreciated
thanks
Mark
