Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGEO1991TRACKER LSI, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ELECTRICALSTARTER - REDUCTION GEARBENCH TESTINGSTARTER COMPONENT INSPECTIONCOMMUTATOR
1991 Geo Tracker LSi, Automatic
Starter Component Inspection: Commutator
1991 Geo Tracker LSi, AutomaticSECTION Commutator
- Using "V" blocks and dial indicator, check commutator runout (out-of-round). Ensure runout is not more than .002"(.05 mm). Turn commutator/armature on lathe until runout (out-of-round) is within specification.
- Check diameter commutator. Commutator should not be less than specification. See MINIMUM COMMUTATOR SPECIFICATIONS . If commutator is cut down more than .008" (.20 mm), undercut insulating mica to depth of .015-.031" (.38 -.78 mm).
MINIMUM COMMUTATOR SPECIFICATIONS
| Application | In. (mm) | |
|---|---|---|
| Metro (A/T) | 1.06 (27) | |
| Prizm | 1.14 (29) | |
| Storm | ||
| A/T | 1.14 (29) | |
| M/T | 1.06 (27) | |
| Tracker | 1.13 (28.8) | |
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.