F 250 2WD LD Pickup V8-4.6L SOHC VIN 6 (1997)
Transmission Cooler: All Technical Service Bulletins
A/T - E4OD Cooler Bypass Valve Service Tip
Article No.
97-4-10
02/17/97
TRANSMISSION - E4OD - COOLER BYPASS VALVE SERVICE DURING TRANSMISSION OVERHAUL - SERVICE TIP
LIGHT TRUCK:
1997 ECONOLINE, EXPEDITION, F-150, F-250 LD
ISSUE:
E4OD transmissions have been equipped with an external Cooler Bypass Valve (CBV) (Figure 1) on some vehicles. The CBV allows some transmission
fluid to bypass the transmission fluid coolers and return to the transmission sump during cold weather operation. This provides taster transmission fluid
warm up and increased lube flow during cold weather operation.
ACTION:
The CBV must be removed and backflushed during a transmission overhaul or contamination may be reintroduced into the transmission, causing a repeat
repair. Refer to the following text for details.
Refer to the appropriate model Workshop Manual, Section 307-01, for CBV backflush procedure. When the CBV is removed, the four (4) sealing
washers (Figure 1) must be replaced. These washers are available in the CBV Sealing Washers Kit (391933). These washers will also be added to the
E4OD Soft Seal Kit (F0TZ-7153-A) in the future.
CAUTION:
THE CBV SEALING WASHERS AND/OR CASE FITTINGS CAN BE DAMAGED IF TOO MUCH BOLT TORQUE IS APPLIED TO THE
CASE COOLER FITTINGS. IF REQUIRED APPLY A FORD-APPROVED THREAD SEALANT TO THE CASE FITTINGS AND TORQUE
TO SPECIFICATION:
^
CASE INLET: 33-40 N.m (24-29 LB-FT)
^
CASE OUTLET: 27-33 N.m (20-24 LB-FT)
NOTE:
IF ENTIRE CBV ASSEMBLY REQUIRES REPLACEMENT, BE SURE TO REMOVE THE SHIPPING CAPS AND 0-RINGS PRIOR TO
INSTALLATION OF THE NEW CBV ASSEMBLY. THE 0-RINGS ARE ONLY USED TO HOLD THE SEALING WASHERS IN PLACE FOR
SHIPPING.
NOTE:
IF THE REMOVED CBV ASSEMBLY HAS AN 0-RING, REMOVE THE 0-RING PRIOR TO RE-INSTALLATION.
CAUTION:
