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6D-20 ENGINE ELECTRICAL (4JK1/4JJ1) Inspection and Repair Make the necessary adjustments, repairs, and part Armature 1. Measure the commutator run-out. Replace the commutator if the measured run-out exceeds the specified limit. Commutator Run-Out mm (in) Standard Limit 0.05 (0.002) 0.25 (0.010)
RTW46DSH003501 2. Check the commutator mica segments for excessive wear. 3. Measure the mica segment depth. Mica Segment Depth mm (in) Standard Limit 0.5 - 0.8 (0.020 - 0.030) 0.2 (0.008) If the mica segment depth is less than the standard but more than the limit, the commutator may be reground.
If the mica segment depth is less than the limit, the commutator must be replaced.
RTW56DSH000701 Legend 1. Insulator 2. 0.5 - 0.8 mm (0.020 - 0.030 in) 3. Commutator Segments 4. Correct 5. Incorrect
4. Measure the commutator outside diameter. Commutator Outside Diameter mm (in) Standard Limit 36.5 (1.44) 35.5 (1.40)
If the measured outside diameter is less than the specified limit, the commutator must be replaced.
HCW51ESH000901
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