Starter Inner Parts Inspection

Armature 

1. Verify that there is no continuity between the commutator and the core at each segment using a tester.

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   • If there is continuity, replace the armature.
2. Verify that there is no continuity between the commutator and the shaft using a tester.

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   • If there is continuity, replace the armature.
3. Place the armature on V-blocks, and measure the runout using a dial indicator.

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   • If not within specification, replace the armature.

     Starter armature runout 

     0.1 mm {0.004 in} max.

4. Measure the commutator diameter.

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   • If not within the minimum specification, replace the armature.

     Starter commutator diameter 

     Standard: 29.4 mm {1.16 in}

     Minimum: 28.8 mm {1.13 in}

5. Measure the segment groove depth of the commutator.

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   • If not within the minimum specification, undercut the grooves to the standard depth.

     Segment groove depth of starter commutator 

     Standard: 0.5 mm {0.02 in}

     Minimum: 0.2 mm {0.008 in}

Magnetic switch 

1. Inspect for continuity between terminals S and M using a tester.

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   • If there is no continuity, replace the magnetic switch.
2. Inspect for continuity between terminal S and the body using a tester.

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   • If there is no continuity, replace the magnetic switch.
3. Verify that there is no continuity between terminals M and B using a tester.

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   • If there is continuity, replace the magnetic switch.

Brush and brush holder 

1. Verify that there is no continuity between each insulated brush and plate using a tester.

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   • If there is continuity, replace the brush holder.
2. Measure the brush length.

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   • If any brush is worn almost to or beyond the minimum specification, replace all of the brushes.

     Starter brush length 

     Standard: 12.3 mm {0.484 in}

     Minimum: 5.5 mm {0.22 in}

3. Measure the brush spring force using a spring balance.

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   • If not within the minimum specification, replace the brush and brush holder component.

     Starter brush spring force 

     Standard: 15.0-20.4 N {1.53-2.08 kgf, 3.38-4.58 lbf}

     Minimum: 2.75 N {0.280 kgf, 0.618 lbf}