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The crankcases were prepared for assembly by fitting new oil seals, 60mm O/D, 40mm I/D, 10mm wide for the rear crankcase and 47mm O/D, 30mm I/D, 10mm wide for the front crankcase (Simar 0061). The front crankcase also contains a double roller bearing (Simar 0062). As this bearing sits in a blind hole, it cannot be pressed out, so removal would require a special blind bearing removal tool which normally results in the bearing being damaged. As the bearing was in good order, I did not attempt to remove it. The rear crankcase contains a machined groove into which is inserted a felt washer (Simar 0063). A new paper gasket was fitted to the reverse gearbox casing (Simar 0064) and the rear crankcase secured into position on the three long M8 studs (Simar 0065). At the same time, the M8 x 50 bolts were fitted which secure the reverse gearbox to the main gearbox and rear crankcase to the reverse gearbox (Simar 0066). All were gradually tightened, in the same fashion as a cylinder head, to ensure an even pressure.
I did not take the engine crankshaft apart (Simar 0067), as reassembling would require a jig to ensure both front and rear sections of the crankshaft are perfectly concentric. The whole lot was slid into place, taking care not to damage the oil seal in the rear crankcase (Simar 0068). A distance washer is fitted up against the front flywheel before the front crankcase is installed (Simar 0069). The front crankcase is fixed to the rear crankcase by two M8 x 55 bolts. The other four vacant fixing holes visible in the photo also carry the front cooling fan casing. Four short M8 studs and paper gasket were then fitted ready for the cylinder barrel (Simar 0070).Attachments:
The handlebars are attached to the steering column via a locking handle and M12 nut (Simar 0054 & 55). Note that the M12 nut is larger across the flats than a normal plain M12 nut, as it fits into a hexagon recess at the handlebar pivot.
Before the engine could be fitted, there were a few items left to go in the reverse speed gearbox. The roller bearing for the end of the worm drive shaft went in first (Simar 0056), followed by the locking plunger for the reverse gear lever (Simar 0057). I did not fit the actual reverse gear lever at this stage, just in case I needed to manipulate the clutch when fitting the engine. To complete the worm drive shaft, a distance washer and thrust ring are fitted (Simar 0058), along with the clutch fork (Simar 0059). The clutch fork is held on the shaft via a washer and 4 x 20mm split pin (Simar 0060). When the legs of the split pin are bent over, they are very close to the reverse gearbox casing, so check the clutch operation a few times to make sure they don’t foul.Attachments:
Good progress this evening got bolts painted on rotovator head so that’s that about finished. Also removed engine from the frame. Sooo next job is to sandblast all the frame get it ready.
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