NAG1 Automatic Transmission
REMOVAL
1. Move selector lever to position P.
2. Raise vehicle.
3. Disconnect 13-pin plug connector (1). Turn bayonet lock of the adapter plug (2) anti-clockwise.
4. Loosen the adapter plug bolt (9) and remove from the adapter plug (10) from the transmission housing.
5. Detach oil pan (5).
6. Remove oil filter (4).
7. Unscrew Torx socket bolts (3) and remove electrohydraulic control module (2).
DISASSEMBLY
Electrical Unit Components:
1. Remove electrohydraulic unit from the vehicle.
2. Remove solenoid caps (1, 2).
3. Unscrew Torx socket bolts (3, 4).
NOTE: Pay attention to the different lengths of the Torx socket bolts.
4. Remove leaf springs (5).
5. Withdraw solenoid valves (6 - 11) from shift plate (13).
NOTE: Check O-rings on solenoid valves for damage and replace if necessary.
6. Bend away retaining lug on stiffening rib on transmission oil temperature sensor.
7. Remove electrohydraulic control module (12) from the shift plate (13).
8. Note the locations of the major shift valve group components for assembly reference.
A - Operating and Lubricating Pressure Regulating valves and 2-3 Overlap valve
B - 1-2/4-5 Shift Group and Shift, Shift Valve, and Regulating Valve Pressure Regulating Valves
C - 3-4 Shift Group
D - 2-3 Shift Group, TCC Lock-up, and B2 Regulating Valves
NOTE: Pay great attention to cleanliness for all work on the shift plate. Fluffy cloths must not be used. Leather cloths are particularly good. After dismantling, all parts must be washed and blown out with compressed-air, noting that parts may be blown away.
9. Unbolt leaf spring (5).
10. Unscrew Torx bolts (1).
11. Remove valve housing (2) from valve body (4).
12. Remove sealing plate (3).
13. Remove the strainers (1, 2) for the modulating pressure and shift pressure control solenoid valves from the valve housing.
14. Remove the strainer (1) in the inlet to torque converter lock-up control solenoid valve.
NOTE: A total of 12 valve balls are located in the valve body, four made from plastic (4) and eight from steel (1, 3).
15. Note the location of all check balls (1, 3, 4) and the central strainer (2) for re-installation. Remove all check balls (1, 3, 4) and the central strainer (2).
Valve Body Components:
16. Remove the screws holding the side covers to the valve body and valve housing.
17. Remove all valves and springs from the valve body (1). Check all valves for ease of movement and shavings.
NOTE: The sleeves and pistons of the overlap regulating valves must not be mixed up.
Valve Housing Components:
18. Remove all valves and springs from the valve housing (2). Check all valves for ease of movement and shavings.
19. Remove the pressure supply valve (1) from the valve body.
ASSEMBLY
NOTE: Pay great attention to cleanliness for all work on the shift plate. Fluffy cloths must not be used. Leather cloths are particularly good. After dismantling, all parts must be washed and blown out with compressed-air, noting that parts may be blown away.
1. Install the pressure supply valve (1) into the valve body
Valve Body Components:
NOTE: The sleeves and pistons of the overlap regulating valves must not be mixed up.
2. Install all valves and springs from the valve body (1). Check all valves for ease of movement and shavings.
3. Install the screws to hold the side covers to the valve body. Tighten the screws to 4 Nm (35 inch lbs.).
Valve Housing Components:
4. Install all valves and springs into the valve housing (2). Check all valves for ease of movement and shavings.
5. Install the screws to hold the side covers to the valve housing. Tighten the screws to 4 Nm (35 inch lbs.).
NOTE: A total of 12 valve balls are located in the valve body, four made from plastic (4) and eight from steel (1, 3).
6. Install all check balls (1, 3, 4) and the central strainer (2).
7. Install the strainer (1) in the inlet to torque converter lock-up control solenoid valve.
8. Position the sealing plate (3) onto the valve body (4).
9. Install the valve housing (2) onto the valve body (4) and sealing plate (3).
10. Install the shift plate Torx bolts (1). Tighten the bolts to 8 Nm (71 inch lbs.).
11. Install leaf spring (5).
12. Install the strainers (1, 2) for the modulating pressure and shift pressure control solenoid valves into the valve housing.
Electrical Unit Components:
13. Install the electrohydraulic control module (12) onto the shift plate (13).
14. Bend the retaining lug on stiffening rib on transmission oil temperature sensor to retain the electrohydraulic control module.
15. Install the solenoid valves (6 - 11) into shift plate (13).
NOTE: Check O-rings on solenoid valves for damage and replace if necessary.
16. Install the leaf springs (5).
17. Install the Torx socket bolts (3, 4). Tighten the bolts to 8 Nm (71 inch lbs.).
NOTE: Pay attention to the different lengths of the Torx socket bolts.
18. Install the solenoid caps (1, 2).
19. Install the electrohydraulic unit into the vehicle.
INSTALLATION
1. Position the electrohydraulic unit in the transmission housing.
2. Insert selector valve (1) in driver of detent plate (2). When installing the electrohydraulic control module in the transmission housing, the plastic part of the selector valve (1) must engage in the driver of the detent plate (2).
3. Install the Torx socket bolts (3) and torque to 8 Nm (71 inch lbs.).
4. Install a new oil filter (4).
5. Install oil pan (5) and torque the oil pan bolts to 8 Nm (71 inch lbs.).
6. Install the adapter plug (10) into the transmission housing and tighten the bolt (9) to 2.5 Nm (22 inch lbs.).
7. Check O-ring on plug connector (1), and replace if necessary.
8. Install the plug connector (1) into the adapter plug (2). Turn bayonet lock of adapter plug (2) clockwise to connect plug connector (1).
9. Fill the transmission with the correct oil.