Take the barrel off first...put a slave nut if youve got one (1/2" 16 BSF) and screw it on the top crankshaft not letting it come thru the nut. grasp the upper crank case assy and place the unit a few cms above a wood or soft surface. gently hit the upper shaft and it will normally drop through. increase pressure if you need to. the lower assy still has the boss on as deejay has stated. since the halves are apart you wont get a decent hit to the boss without damaging the crankcase. support the lower shaft upside diwn on blocks supporting both sides evenly making sure you have wood or something soft in the mating surfaces. put the nut on t he shaft and same as the top hit the nut and force the boss onto the seal and push them through together. if you have access to a press the same process applies. but always make sure the nuts is 3/4 on the shaft so it doesnt get damaged. you can also heat the lower crank case assy and heat the seal so it falls through easier.
Your mower is a model 5 series 1...The engine serial denotes either a model correctly fitted model 5 S1 or a model 4 engine fitted to your model 5S1 base. the reason for the uncertainty is this serial is very low for your mower and if priven accurate could possibly be one of the very first model 5S1's produced by victa. This is one of the last serial transitions we are currently reasearching but at this point it appears to be accurate for your mower and a very slight possibilty it was produced in 57 but more likely early 58. Anyways a nice early Victa youll have fun restoring...any questions you need ask, we have all the answers...welcome and enjoy!
Mal...
