TM 10-3930-653-14&P Primary voltage V .............................................. 12 Spark gap mm (in ........................................ More than 7 (0.28) Primary resistance at 20°C (68°F) W    ..............................................3.4 to 4.2 Secondary resistance at 20°C (68°F) K.............................................. 8 4-7-1-2. SERVICE DATA (1) Starting motor Brush Brush length mm (in) .......................................18.5 (0.728) Wear limit mm (in) .......................................7.0 (0.276) Brush spring tension kg (lb) .........................................1.4 to 1.8 (3.1 to 4.0) Commutator Outer diameter mm (in) .......................................38.7 (1.524) Wear limit mm (in) .......................................2 (0.079) Taper limit mm (in) .......................................0.05 (0.0020) Depth of mica Wear limit mm (in).......................................0.2 (0.008) Repair accuracy mm (in) .......................................0.5 (0.020) Clearance between armature shaft and bearing Wear limit mm (in) .......................................0.2 (0.008) Repair accuracy mm (in) . .....................................0.03 to 0.10 (0.0012 to 0.0039) Armature shaft diameter Pinion side mm (in) .......................................14.2 (0.559) Rear end mm (in) .......................................11.0 (0.433) Wear limit mm (in) .......................................0.1 (0.004) Bend limit mm (in) .......................................0.08 (0.0031) Gap "l" between and pinion front mm (in) .......................................0.5 to 2.0 (0.020 to 0.079) edge and pinion stopper (2) Alternator Rotor coil Resistance W [at 20°C (68°F)] ......................3.57 Brush Brush length mm (in) .......................................18 (0.71) Wear limit mm (in) ........................................10 (0.39) Spring pressure kg (lb) .........................................0.32 to 0.43 (0.71 to 0.95) Slip ring Outer diameter mm (in) .......................................33 (1.30) Reduction limit mm (in) .......................................0.5 (0.020) Repair accuracy mm (in) .......................................0.05 (0.0020) 4-87

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