Section 03-06: Starting System | 1996 F-Series and Bronco Workshop Manual |
The armature shaft is supported on three sintered bronze bushings installed in the drive end housing, lever housing and brush end plate.
These bushings have a dull finish, as compared to the early-type machined, cast bronze bushings which had a shiny finish.
The bushings can be pressed or tapped out of their housing using a suitable puller or driver of the appropriate size. Be sure the housing is well supported.
All bushings, wicks and oil reservoirs should be saturated with SAE No. 20 oil.
Before pressing the bushing into place, dip it in SAE No. 20 oil. Also, tangent wicks should be soaked with SAE No. 20 oil. Insert the wick into place first, and then press in the bushing.
Do not drill, ream or machine sintered bushings in any way. These bushings are supplied to size. If drilled or reamed, the ID (inside diameter) will be too large; also, the bushing pores will be sealed over.
It is not necessary to cross-drill a sintered bushing when used with a tangent wick. Because the bushing is so highly porous, oil from the wick touching the outside bushing surface will bleed through and lubricate the shaft.
The lever housing bushing prevents starter motor armature deflection during cranking. As compared to end frame bushings, the clearance between the lever housing bushing and shaft is large and the clearance provides a loose fit when assembled.