Shorrocks Servicing Tips page 2

BELOW and on the subsequent pages are the content of the original Shorrocks dismantling and reassembling instructions for CB75B and C142B units, kindly supplied by sprinter Chris Illman.

Removal of vane assembly.

A special mandrel to the dimensions given further on is essential. Place mandrel against end of vane shaft, invert (Fig. 6). and tap end of mandrel on bench when the vane assembly will slide onto the mandrel on which it should be retained until re-assembly. The trunnions will come out with the vane assembly and if removed from the vanes (Fig. 7), should be identified each with its own vane so that on re-assembly each trunnion may be replaced on its original vane with all relative bearing surfaces repositioned as prior to dismantling. Under no circumstances should the vane assembly be dismantled or removed from the mandrel. No attempt should be made to replace one or more vanes or ballraces, as owing to the accuracy and balance required we only supply a new vane assembly complete and do not supply separate parts for this assembly.

Removal of rotor.

Clear the centre-punch depressions in the heads of the countersunk screws securing the locking plate at the bottom of the rotor and remove screws (Fig. 8) and plate. Withdraw rotor complete with ball race (Fig. 9) from rear end plate.

Removal of rotor ball race.

Remove countersunk head screws, first clearing screws, and remove locking plate. Remove ball race.
The vane shaft cannot be separated from the rear end plate. They are locked together for accuracy of alignment and are supplied as a complete assembly. (Fig. 10).

The supercharger is now completely dismantled.