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 MANUALSTOYOTA19904RUNNER 2D UTILITY, 3.0 V, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE MECHANICALSTARTERBENCH TESTINGCOMMUTATOR TEST
1990 Toyota 4Runner 2D Utility, 3.0 V, Automatic
Commutator Test
1990 Toyota 4Runner 2D Utility, 3.0 V, AutomaticSECTION Commutator Test
- If out-of-round is more than .002" (.05 mm), turn the commutator on a lathe until out-of-round is within specification.
- Wear or cutting limit of commutator is 1.22" (31.0 mm) for Cressida and Supra, and 1.14" (29.0 mm) for all others.
- If worn to less than .008" (.20 mm), undercut insulating mica to a depth of approximately .015-.031" (.40-.80 mm).
RENDER: 1.0x
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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.