Dan,
I agree with Grant: the engine is the Auxiliary Generator engine - a Morris 4 cylinder side valve model USNMH Mk2 or Mk2/1. These assemblies required frequent changing in service.
The tank is not equipped with an armoured rear fuel tank, hence the infantry phone is still mounted on the rear louvre plate. Might this be a later Mk.7 hull? The spare road wheel is mounted on the same plate, hanging from the tow rope link mount: not unusual, as the carriage of spare roadwheels was not part of the original stowage design, but found to be necessary, hence the position varies quite a bit between units/vehicles.
The 'strange' item between the side bins appears to be one of the engine deck covers, raised and leaning against the side of the turret between the bins. It is hard to see for sure.
Mike C
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