Econoline E350 1 Ton V8-5.4L Prop SOHC VIN Z (1998)
Torque Converter: Initial Inspection and Diagnostic Overview
1. If the torque converter is being replaced, continue with sub-step 2 of Step 2.
2. If the torque converter is not being replaced the following procedures must be performed:
1. The torque converter must be thoroughly cleaned.
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Torque converters with drain plugs may be cleaned by using the Torque Converter/Oil Cooler Cleaner.
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Torque converters without drain plugs may be cleaned by hand. Partially fill the torque converter using only the recommended
transmission fluid for the applicable transmission. Hand-agitate the torque converter and then thoroughly drain the fluid. Refill the torque
converter with new fluid specified for the transmission, and reinstall.
2. The in-tank and auxiliary coolers must be thoroughly cleaned by forward and backward flushing.
3. The cooler lines must be thoroughly cleaned by backward and forward flushing.
4. All Cooler Bypass Valves (CBV), if equipped, must be thoroughly cleaned.
5. Perform the Transmission Fluid Cooler Flow Test.
6. If the transmission cooling system fails the Transmission Fluid Cooler Flow Test, the fluid cooler, cooler bypass valve, and/or cooler lines
must be replaced.
7. If the coolers or cooler by-pass valve are to be replaced use only factory-approved service parts.
