Alternator Overhaul: Overhaul

NOTE: Refer to the Exploded View as needed during this procedure. See EXPLODED VIEW .

Test the alternator and regulator before you remove them (see ALTERNATOR AND REGULATOR CIRCUIT TROUBLESHOOTING ).
Remove the alternator (see ALTERNATOR REMOVAL AND INSTALLATION ).
If the front bearing needs replacing, remove the pulley locknut with a 10 mm wrench (A) and a 22 mm wrench (B). If necessary, use an impact wrench.

Fig 1: Removing Pulley Locknut
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Remove the harness stay and the three flange nuts from the alternator.

Fig 2: Identifying Harness Stay And Flange Nuts
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Remove the end cover.

Fig 3: Identifying End Cover
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Remove the brush holder.

Fig 4: Identifying Brush Holder
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Remove the four bolts, then remove the rear housing assembly (A), and washer (B).

Fig 5: Identifying Rear Housing Assembly And Washer
Courtesy of AMERICAN HONDA MOTOR CO., INC.
If you are not replacing the front bearing, go to step 13. Remove the rotor from the drive end housing.

Fig 6: Identifying Rotor
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Inspect the rotor shaft for scoring, and inspect the bearing journal surface in the drive end housing for seizure marks.
- If the rotor is damaged, replace the rotor assembly.
- If the rotor is OK, go to step 10.
Remove the front bearing retainer plate.

Fig 7: Identifying Front Bearing Retainer Plate
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Drive out the front bearing with a brass drift and hammer.

Fig 8: Removing Front Bearing
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Install a new front bearing in the drive end housing with a hammer, the handle driver, and attachment (42 x 47 mm).

Fig 9: Installing Front Bearing
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Alternator Brush Inspection
Measure the length of both brushes (A) with a vernier caliper (B).
- If either brush is shorter than the service limit, replace the brush holder assembly.
- If brush length is OK, go to step 14.
Fig 10: Measuring Length Of Brushes With Vernier Caliper
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Rotor Slip Ring Test
Check for continuity between the slip rings (A).
- If there is continuity, go to step 15.
- If there is no continuity, replace the rotor assembly.
Fig 11: Identifying Slip Rings, Rotor And Rotor Shaft
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Check for continuity between each slip ring and the rotor (B) and the rotor shaft (C).
- If there is no continuity, replace the rear housing assembly, and go to step 16.
- If there is continuity, replace the rotor assembly.
Alternator Reassembly
If you removed the pulley, put the rotor in the drive end housing, then tighten its locknut to 110 N.m (11.2 kgf.m, 81.0 lbf.ft).
Remove any grease or any oil from the slip rings.
Put the rear housing assembly and drive end housing/ rotor assembly together, tighten the four through bolts.
Push the brushes (A) in, then insert a pin or drill bit (B) (about 1.6 mm (0.06 in.) diameter) to hold them there.

Fig 12: Pushing Brushes And Inserting Pin
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Install the brush holder, and pull out the pin.

Fig 13: Pulling Out Pin From Brush Holder
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Install the end cover.
After assembling the alternator, turn the pulley by hand to make sure the rotor turns smoothly and without noise.
Install the alternator (see INSTALLATION ) and drive belt (see DRIVE BELT INSPECTION ).