Hi Alan Hope this helps. Shaft,you should be able to see a male tapered section,a splined section & the threaded bit for the retaining nut,the fan central hub is tapered female and splined. The retaining nut on some pumps is castellated with a split pin ,good, other pumps have a knackered Symonds nut and loctite if you are lucky,not so good, as the nut tends to undo with noisy expensive results. No idea of the torque but as tight as you dare assumining taper and splines in good shape .There is also a plain washer and a spring washer .If the nut has loosened the the splines/taper will be wrecked and you will never get them to stay together properly.I think CPrince has produced a modded shaft assy that is simpler/stronger. The only exploded drg I know of is in the S11/TE parts book ,plate D p98 & there may be a similar book for the S1.The parts book is a fantastic source of info and the S11 book covers most of the S1 Good luck Peter Posted by Peter Martin 16/09/2013 20:42:14
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