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Make sure you use correct bearings. As the alt spins so fast, standard tolerance bearings tend to fail premature.
I have found the slip rings fail at about 500k miles (not km).
Often the pulley shows its age by then and has a widened V. This causes the belt to run on the bottom of the V & not grip so well under load. If you are replacing the brushes make sure the slots in the reg are ok & the new brushes are not able to go sideways a little. If they can, they & the slip rings will not last.
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Grumpy Old Diesel Owners Club group
I no longer question authority, I annoy authority. More effect, less effort....
1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles 
1987 250td 160k miles English import 
2001 jeep turbo diesel 130k miles 
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving
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