REAR BEARING ASSEMBLY
1. Assembly alternator, including end housing, but
leave out rear bearing and fan. Make sure mount-
ing feet are aligned.Install front pulley bushing on
shaft.
2. There are two types of rear bearing systems used:
press fit and loose fit.
PRESS FIT REAR BEARINGS
Stand alternator on front end, in a press, supporting
the front bearing bushing. Insert bearing over rear end
of shaft. Place bearing insertion tool (part of BF4821
package) over bearing and press until inner race of
bearing is seated onto shaft shoulder (Figure 13-37).
Use caution when bearing outer race begins to enter
end housing bore because misalignment at this point
can damage housing.
LOOSE FIT REAR BEARINGS
Before starting installation of loose fit rear bearings,
check that O-ring is greased (grease with Amoco
Rykon or equivalent) and properly installed in O-ring
groove in housing bore. Continue with bearing instal-
lation as above.
3. Turn shaft by hand to make sure it spins freely.
Fan and fan hardware can now be installed.
REGULATOR ASSEMBLY
1. Set regulator on rear housing with regulator plug
toward control box.
2. Using mounting hardware (coated with Loctite),
attach regulator to end housing (Figure 13-38).
Torque screw to 32 in. lbs. (3.6 N.m) maximum.
3. Connect regulator to regulator harness from con-
trol unit.
FIGURE 13-37.
1. Ball Bearing 5. Front Housing
2. Shaft 6. End Housing
3. Support 7. BF4821 Insertion Tool
4. Bushing
FIGURE 13-38.
M13-24 Niehoff Alternator Overhaul Manual M13003 04/01
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