A/T - AOD, Harsh Down Shifts
83ford12Article No. 83-13-9
TRANSMISSION - AOD - HARSH DOWN SHIFT
FORD 1983 ALL CARS
LINCOLN-MERCURY 1983 ALL CARS
LIGHT TRUCKS 1983 ALL LIGHT TRUCKS
CALIBRATIONS: All with AOD Transmission and 2150 2V carburetor
If the torsion return spring binds on the throttle shaft, and prevents the TV linkage from completely returning to idle position, the result may be harsh down shifts. An external assist spring can be added to assure positive TV linkage return.
If a vehicle exhibits the above shift concerns, first, determine if it is caused by the lack of return of the TV linkage by the following diagnostic procedure.
1. Place the transmission in Neutral or Park.
2. Bring the engine to normal operating temperature.
3. Remove the air cleaner.
4. With the engine running and the transmission in a forward gear and the foot service brake pedal applied, accelerate the engine to approximately onehalf throttle then slowly return the throttle to idle.
5. While still idling in a forward gear, have another Technician visually check that the TV linkage at the carburetor returned all the way to idle. This can be determined by observing if there is a gap between the TV lever adjusting screw and the throttle lever pad.
6. Shut off the engine.
7. If a gap occurred, determine if it was caused by interference with the TV rod or binding of the grommets. If no interference or binding of the grommets exists, lack of return of the TV linkage is due to insufficient return force from the torsion spring at the carburetor. Follow the procedure for installation of a new TV return spring.
NOTE: A TV lever gap at idle may be caused by a short TV rod. However, the shift concerns would not be harsh 3-4, 4-3 shifts or harsh engagements, but they would be characterized by early soft shifts and slip/bump during upshifts.
8. If no gap occurred at the TV lever adjusting screw and the throttle lever pad, the subject shift concerns may be caused by a misadjusted TV rod that is set too long.
To Install a New TV Lever Return Spring:
1. Disconnect the transmission TV rod at the carburetor lever.
FIGURE 6:
2. Install the drill. guide fixture (furnished in kit No. E3PZ-9590-A) over the TV lever ball stud (Figure 6).
3. With a greased #17 (.170) drill bit, (drill guide in position) drill through the lever. Use care as the drill breaks through. Wipe/contain the metal chips during the drilling. Re-apply grease to the bit as necessary.
4. Deburr the hole (both sides) and press in the Thompson Nyliner bushing #212-FF furnished with large diameter flange outboard. The bushing prevents spring tang breakage due to torsional friction.
5. Unhook the torsional spring where it loops around the TV lever.
6. Cut the loop (or hook area) of the spring with side cutters to prevent possible interference at wide open throttle. Cover with cloth to contain the broken piece.
7. Install a new return spring #E3PE-7C741-AA furnished, attaching it through the Nyliner bushing and to the hole in the throttle solenoid positioner (TSP) bracket, as on previous models.
8. Verify freedom of movement of the lever and reinstall the transmission TV rod.
9. Recheck returnability of the TV lever per steps 4 and 5 of the diagnostic procedure.
10. Check/reset curb idle speed to the specification on the engine decal. If readjustment required more than a 50 RPM change, recheck the TV rod adjustment per section 17-20 of the applicable shop manual.
PART NUMBER PART NAME CLASS
E3PZ-9590-A Carburetor Service Kit CG
OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: Reimbursable within the provisions of the Warranty and Policy Manual.
OPERATION: SP9510C83
TIME: 0.6 Hr. DLR. CODING: Basic Part No. 9510 Code: 41