Before fitting the drive side crankcase cheek the following points:
One solid end and one hollow. dowel are fitted to the mating faces.
The gear selector drum support is fitted between the selector rail locations in the drive side ease.
From Engine No. 0156 there is a groove machined in the driveside crankcase. This groove contains a sealing cord, which should protrude slightly (1mm) above each barrel face when the cases are bolted up.
Should any difficulty be experienced when joining the crankcases, remove the drive side crankcase and check the heights of the gearbox parts.
Fit the three screws around the gearbox output shaft and the three crankcase screws within the timing cover. These screws should all be fitted and tightened before the gasket compound hardens.