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 MANUALSFORD1990RANGER 4WD L4-140 2.3L SOHCREPAIR AND DIAGNOSISTECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSTORQUE CONVERTER - CLEANING AND REPLACEMENT GUIDELINESSERVICE PROCEDUREREPLACEMENT
1990 Ford Ranger 4WD L4-140 2.3L SOHC
Replacement
1990 Ford Ranger 4WD L4-140 2.3L SOHCSECTION Replacement
The torque converter must be replaced if one or more of the following statements are true:
^ A torque converter malfunction has been determined based on completed diagnostic procedures
^ A converter stud(s), impeller hub or bushing is damaged
^ If there is discoloration of the torque converter (due to overheating)
^ The torque converter is found to be out of specification when performing the following checks (as applicable):
1. Torque Converter One-way Clutch Check
2. End Play Check
3. Stator-to-Turbine Interference Check
4. Converter Leakage Check
5. Stator-to-Impeller Interference Check
^ If there is evidence of transmission assembly or fluid contamination due to the following failure modes:
Torque converter Replacement Policy Failure Modes Major metallic failure
Multiple clutches or clutch plate failures
Sufficient component wear which results in metallic contamination
^ A torque converter malfunction has been determined based on completed diagnostic procedures
^ A converter stud(s), impeller hub or bushing is damaged
^ If there is discoloration of the torque converter (due to overheating)
^ The torque converter is found to be out of specification when performing the following checks (as applicable):
1. Torque Converter One-way Clutch Check
2. End Play Check
3. Stator-to-Turbine Interference Check
4. Converter Leakage Check
5. Stator-to-Impeller Interference Check
^ If there is evidence of transmission assembly or fluid contamination due to the following failure modes:
Torque converter Replacement Policy Failure Modes Major metallic failure
Multiple clutches or clutch plate failures
Sufficient component wear which results in metallic contamination
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.