Fulltext TSBs

Technical Service Bulletins

TSB
97-4-10
  • TRANSMISSION – E4OD – COOLER BYPASS VALVE SERVICE DURING TRANSMISSION OVERHAUL – SERVICE TIP
Publication Date: FEBRUARY 17, 1997

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 faster 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.




Figure 1 – Article 97-4-10

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 (FOTZ-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 O-RINGS PRIOR TO INSTALLATION OF THE NEW CBV ASSEMBLY. THE O-RINGS ARE ONLY USED TO HOLD THE SEALING WASHERS IN PLACE FOR SHIPPING.

NOTE:IF THE REMOVED CBV ASSEMBLY HAS AN O-RING, REMOVE THE O-RING PRIOR TO RE-INSTALLATION.

CAUTION:IF THE COOLER CBV ASSEMBLY IS INSTALLED WITH AN O-RING, THE O-RING MAY NOT ALLOW PROPER SEALING OF THE SEALING WASHERS AND MAY CAUSE A LEAK.

The Cooler Bypass Valve Sealing Washers Kit contains the following:

  • Two (2) 391932-S100 Inlet Sealing Washers
  • Two (2) 391933-S100 Outlet Sealing Washers
  • One (1) Instruction Sheet (I.S. 7229)

PART NUMBERPART NAME
391933Cooler Bypass Valve Sealing Washers Kit

OTHER APPLICABLE ARTICLES:

NONE

WARRANTY STATUS:

Information Only

OASIS CODES:

501000, 502000, 503000, 504000, 510000