I rebuilt both of mine....and a Volvo 740 the same way...they run great now.....If you have trouble finding the brushes just get some larger ones at a starter shop and file to size...The graphite files easily.....

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1978 Yellow 300D (The Mustard Toad)
1980 Blue 240D (The Iron Toad)
1989 Grey Mitsu.4WD Mighty Max Pickup (Needs a Diesel transplant bad)

(Open the pod bay doors HAL)