A/T - Delayed Engagement
NO: 21-05-95 Rev. AGROUP: Transmission
DATE: Jan 5, 1996
SUBJECT: Delayed Transmission Engagement/Torque Convertor Drainback
NOTE:
This bulletin supersedes Technical Service Bulletin 21-05-95 dated April 14, 1995 which should be removed from your files. The Labor Operation Number for the diesel engine has been added and is marked with **asterisks**
MODELS: 1994 - 1995 (BR) Ram Truck
NOTE:
This bulletin applies to vehicles equipped with the 8.0L V10 gasoline or Cummins diesel engines and automatic transmissions.
SYMPTOM/CONDITION:
Delayed transmission engagement of 2 to 8 seconds at driveway start up. Most noticeable after the vehicle has been parked for an extended period, typically overnight.
DIAGNOSIS:
Using the Mopar Diagnostic System or the Scan Tool (DRB II or III) with the appropriate Diagnostic Procedure Manual, verify that all engine systems are functioning as designed. If Diagnostic Trouble Codes (DTC's) are present, record them on the repair order for future reference and repair as necessary. If no codes are present and all systems are functioning correctly, check the transmission fluid level following the procedures outlined in the appropriate Service Manual. If the fluid level is correct, perform the repair procedure.
PARTS REQUIRED:
8.0L V-10
1 52028475 8.01 V-10 Tube & Hose Assy. - Trans Oil Cooler, Pressure
2 52028468 Quick Connect, 1/2" 1/4 x 18 Thread
Cummins Diesel
1 52028579 Cummins Diesel Tube & Hose Assy. - Trans Oil Cooler, Pressure
2 52028469 Quick Connect, 1/2" 3/8 x 18 Thread
2 52028468 Quick Connect, 1/2" 1/4 x 18 Thread
REPAIR PROCEDURE:
This repair involves installing a transmission oil cooler pressure line with built in drainback check valve for both engine types. The 8.0L V-10 will also receive 2 quick connectors at the cooler lines that connect to the transmission. The Cummins Diesel will receive 4 quick connectors - 2 at the transmission and 2 at the engine mounted cooler.
1. Using the appropriate Ram Truck Service Manual, locate and identify the transmission oil cooler pressure line (Figure 1 shows a typical transmission cooler hose arrangement).
CAUTION:
The Drainback Valve is a one-way valve. As such, it must be properly oriented in terms of flow direction. In addition, the valve must be located in the pressure line location only, otherwise flow will be blocked causing overheat and eventual transmission failure.
2. Disconnect the pressure line at both ends, discard this line. On the Diesel, this line goes from the transmission to engine compartment cooler. On the V-10, this line goes from the transmission to auxiliary cooler.
8.0L V-10 & Cummins Diesel
3. Remove the pressure and return line quick connectors from the transmission and discard.
4. Install the new connectors 1/2" 1/4 x 18 thread (P/N 52028468) into the transmission case.
5. Insert new pressure tube and hose assembly with drainback valve into the quick connector. Push line inward until lock tabs secure in the line. A snap should be heard as the tabs seat behind the cooler line flange. Install the current return line in the same manner as the pressure line.
Cummins Diesel Only
6. Disconnect the inlet and outlet lines at the transmission oil to water cooler. Discard the pressure line. Remove the connectors from the cooler and discard.
7. Install the 1/2" 3/8 x 18 THD quick connect, PIN 52028469, at the pressure and return ports in the cooler.
8. Push the new pressure tube and hose assembly and return line inward until lock tabs are secure in the line. A snap should be heard as the tabs seat behind the cooler line flange.
8.0L V-10 & Cummins Diesel
9. Pull outward on cooler lines at all points to verify they are properly secured.
CAUTION:
It is extremely important that cooler line seating be checked as described in step 9. If the lines are not fully secured, normal fluid pressure could unseat the lines resulting in fluid loss and transmission damage.
10. Start the vehicle and check for any leaks.
NOTE:
If any transmission malfunction contaminates the fluid, the cooler and lines must be reversed flushed thoroughly. On vehicles equipped with the drainback check valve, the valve must be removed and discarded before flushing. Replace the valve with a new one after all repairs are completed.
POLICY: Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
Labor Operation No: 21-25-17-96 V-10 0.6 Hrs.
**21-25-17-97 Diesel 0.7 Hrs. **
FAILURE CODE: P8 - New Part