Alternator Maintenance

Revision as of 06:25, 23 May 2012; view current revision
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Keep your alternator in good condition.

Disassembly

1. Remove the brush holder assembly
2. Remove the three 8mm-head long bolts from the rear face. You can use an 8mm socket or 5/16" socket.
3. Then separate like this:

   

Note that one through-bolt is longer than the other two.

Rotor Maintainence

1. Rear Bearing Repack: Carefully pry up a bit of the retainer and pack it with high-temp wheel bearing grease. Then carefully tamp the metal back down.

   

2. Clean the slip rings with ether and polish with super-fine (400 or 600 grit) non-ferrite sand paper.
3. Wipe off all grease. Carefully remove excess grease from back side of bearing and slip rings.
4. The front bearing can be packed in a similar way.

To check if the bearings need changing or packing, spin them. They should be silent, and not spin free which indicate there is no more grease in them. They should turn easily, smoothly and silently.

To get to the front bearing:

1. Remove the pulley with a 13/16" box wrench or socket
   • Use a large screwdriver in the pulley fins to hold it steady while removing the nut

   

2. After the pulley is off, remove the three screws hold the bearing retainer. Then separate the rotor from the aluminum case plate.

   

Rear Bearing

• NSK 620-1Z (metal retainer) or 620-1V (rubber retainer)
• Timken 202SS
• Timken 201SS
• BCA/NATIONAL 201SS

Specs:

• Ball Bearing Outer Race Radius=0.024"
• Bore=0.4724"
• Outer Diameter=1.2598"
• Width=0.3937"
• Inner Race Radius=0.024"

Front Bearing

• NSK 620-2Z
• TIMKEN 203FF
• TIMKEN 202FF
• BCA/NATIONAL 202FF
• SKF 62022ZJ

Specs:

• Ball Bearing Outer Race Radius=0.024"
• Bore=0.5906"
• Outer Diameter=1.378"
• Width=0.4331"
• Inner Race Radius=0.024"