A/T - AOD Service Tip/Manual Update
Article No. 85-11-9TRANSMISSION - AUTOMATIC - AOD - SERVICE TIPS/SHOP MANUAL UPDATE FOR LOW MILEAGE OVERHAULS
FORD 1984-85 FORD, THUNDERBIRD, MUSTANG, LTD
LINCOLN-MERCURY 1984-85 MERCURY, COUGAR, CAPRI, MARQUIS, LINCOLN, MARK VII, CONTINENTAL
LIGHT TRUCK 1984-85 E & F SERIES, BRONCO
Figure 9REVERSE SUN GEAR & DRIVE SHELL:
Contamination blocking the converter drainback valve could prevent proper lubrication and result in overheating and malfunction of various transmission components. Any overheating will be indicated by heat stained blue surfaces on the forward sun gear, reverse sun gear and drive shell and the planetary assembly. Refer to Figure 9.
Figure 8:
When overhauling a low mileage AOD transmission with evidence of overheating, inspect the converter drainback cross hole passage in the pump stator support for contamination, or a spring compressed solid which would indicate a stuck open check ball. (See Figure 8, Hole No. 13.)
NOTE: A low mileage vehicle is considered to have approximately 5,000 miles or less on the odometer.
The converter drainback valve in Hole No. 12 of the pump stator support consists of a spring and a ball with an aluminum ball plug pressed in the passage. If contamination can be seen in the exposed cross hole passage area or if the spring is compressed solid which would indicate a stuck open check ball (can be seen when the stator support is turned over-refer to Figure 8, Hole No. 13), then follow the procedure included here for removal and cleaning of the converter drainback valve. In addition, the converter will have to be replaced.
Converter Drainback Check Valve Removal and Cleaning Procedure
1. To remove the drainback valve (check ball and spring) in Hole No. 12, remove the aluminum ball plug. This can be done by using a suitable punch inserted into the cross Hole No. 13. (See Figure 8.) Discard the aluminum ball plug and the spring. The check ball must be retained for reinstallation.
Figure 10:
2. Flush and clean the passage.
3. Install the check ball and a new spring. Press in flush a new aluminum ball plug as indicated in Figure 10.
4. Reassemble the pump body and stator support assembly according to the procedure in the appropriate model year Shop Manual.
5. Install a new torque converter.
General Transmission Instructions (Typically done during any transmission overhaul)
1. Overhaul the transmission making sure to inspect all hardware for evidence of overheating. Replace parts as necessary. Follow the inspection procedure in Section 17-01 of the Shop Manual.
2. Before reassembly, thoroughly clean all transmission components including the check balls in the forward clutch cylinder, the reverse clutch piston, and the direct clutch piston. Follow the cleaning procedure in Section 17-01 of the Shop Manual.
3. The cooler lines, the intake cooler and the auxiliary cooler (if equipped) should be thoroughly FLUSHED out before reinstalling the transmission.
PART NUMBER PART NAME CLASS
E5AZ-7A205-A Spring & Ball - Kit C
OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: "INFORMATION ONLY"