Econoline E350 1 Ton V8-5.4L CNG VIN M (1999)
Torque Converter: Service and Repair
4R70W
Torque Converter Cleaning and Inspection
1. If the torque converter is being replaced, continue with Substep 2 of Step 2.
2. If the torque converter is not being replaced, the following procedures must be performed:
1
The torque convener must be thoroughly cleaned.
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Torque converters with drain plugs can be cleaned by using Torque Converter/Oil Cooler Cleaner.
-
Torque converters without drain plugs can be cleaned by hand. Partially fill the torque converter using only 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 transmission, and reinstall.
2
All in-tank and auxiliary coolers must be thoroughly cleaned by forward and backward flushing.
3
All 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 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 are to be replaced, use only factory approved service parts.
Torque Converter Flushing
NOTE: When the transmission has been repaired for internal damage the torque converter must be cleaned using a mechanically agitated cleaner.
1. Use Torque Converter/Oil Cooler Cleaner to clean and flush the torque converter.
2. After flushing, drain the remainder of the solvent.
3. Add 1.9 liter (2 qt.) of clean transmission fluid to the converter and agitate by hand.
4. Thoroughly drain the solution.
Torque Converter Service and Replacemen
1. 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 complete diagnostic procedures.
^
Converter studs (5), impeller hub or bushing are damaged.
^
Discoloration (due to overheating).
^
The torque converter is found to be out of specification when performing one of the following torque converter checks:
-
One-Way Clutch Check
-
End Play Check
-
Stator to Turbine Interference Check
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Stator to Impeller Interference Check
-
Torque Converter Leak Check
^
Evidence of transmission assembly or fluid contamination due to the following transmission or converter failure modes:
-
Major Metallic Failure
-
Multiple Clutches or Clutch Plate Failures
-
Sufficient Component Wear which results in Metallic Contamination
