Rolls-Royce Remote Oil Filler Valve Bulletin - Code7700

(5) Effect of Bulletin on:(a) OperationNot affected.(b) MaintenanceNot affected.(c) OverhaulNot affected.Printed in Great BritainD. Description(d) Repair SchemesNot affected.(e) InterchangeabilityNot affected.(f) Fits and ClearancesNot affected.This Service Bulletin introduces a new ROFV with improved sealing of the inletcheck valve and the overfill valve.The changes are as follows:(1) The skirt length of the valve piston is decreased without changes to thepiston overall length. This makes sure that the fill port to the oil tankis never completely blocked (i.e. no 'hydraulic lock' possible).(2) The overfill valve outside diameter is decreased from between 24,64 and25,15 mm (0.970 and 0.990 in.) to between 24,64 and 24,77 mm (0.970 and0.975 in.). This makes sure that there is adequate clearance between theoverfill valve outside diameter and the counterbore inside diameter.(3) A new main bore machining process is introduced to give an improvedsurface finish.Jul.14/06Jul.14/06TAY−79−1698Page 2