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.
1972 BMW 3.0CS Automatic TransFACTORY OEM SERVICE PROCEDURE
Testing & Repairing: Rotor
- Test claw pole rotor for short circuits to ground. Test voltage should be 40V AC. Measure resistance of exciter (field coil) in rotor with ohmmeter. See SPECIFICATIONS for proper value. Turn down slip rings on a lathe, using suitable tailstock chuck (EFAW 75 or GDF 85 R 3).
- After turning, check concentricity of slip rings with dial gauge. Runout should not exceed 0.001" (0.03 mm). Minimum diameter of slip rings may be 1.25" (31.5 mm). Maximum runout of pole wheel must not exceed 0.002" (0.05 mm).
Factory Service Tools
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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.