perryh posted:Does anyone know the purpose of the screw on top of the motor housing? Is it suppose to contact the pad on the top of the rotor shaft? Mine has a gap.
From a Lucas repair manual
Adjust armature end float
.
"To check armature end float when a non adjustable thrust screw is fitted perform the following operation.
Position a feeler gauge between armature shaft and thrust screw. Push armature towards cover.
End float should be 0.002-0.008 in.
In the unlikely event of adjustment being required end float may be increased by fitting shim washer/washers under thrust screw head or reduced by mounting thrust screw in lathe and removing metal from underside of head.
If a service replacement armature is fitted it should be supplied with an adjustable thrust screw and lock nut as a boxing sundry.
To adjust armature end float when an adjustable thm.st screw and lock nut is fitted perform the following operation.
Slacken lock nut.
Screw thrust screw in until resistance is felt. Screw thrust screw out quarter of a turn—maintain in this position and tighten lock nut.
Thus I would assume, the position of the cover bearing should set the commutator to brushes AND put the armature in the center of the stator. then the "screw" set the thrust end play