B2

NAG1 TRANSMISSION

HOLDING CLUTCH B2
DISASSEMBLY





1. Remove snap ring (1) (Fig. 158).
2. Take multiple-disc pack B2 (2) and disc spring (3) out of the outer multiple-disc carrier B2 (8). The outer multiple-disc carrier for the multi-disc holding clutch B2 is the piston for the multiple-disc holding clutch B3 at the same time.
3. Place the Multi-use Spring Compressor 8900 on the spring disc (14) and compress the spring until the groove for the snap-ring is exposed.
4. Remove snap-ring (16) (Fig. 158).
5. Remove spring plate (15) and disc spring (14).
6. Separate piston guide ring (13) and the B2 piston (10) from the B3 piston (8) by blowing compressed air into the bore (D) (Fig. 159).
7. Press piston guide ring (13) out of the B2 piston (10).





8. Separate piston guide (4) from the B3 piston (8) by blowing compressed air into the bore (A) (Fig. 159).

ASSEMBLY





1. Assemble piston guide (4) (Fig. 160) and B3 piston (8) in the correct position.





2. Check all sealing rings (Fig. 161), replace if necessary. The rounded off edges on the sealing rings (6), (3), and (2) must point outwards. The rounded off edges on the sealing ring (4) must point inwards.
3. Insert B2 piston (10) (Fig. 160) in B3 piston (8).





4. Insert piston guide ring (2) (Fig. 162). The valve (1) in the piston guide ring must be on top.
5. Insert disc spring (14) (Fig. 160) and spring plate (15). Insert disc spring with the curvature towards the spring plate
6. Place Multi-use Spring Compressor 8900 on the disc spring (14) and compress the spring until the groove for the snap-ring is exposed.
7. Insert snap-ring (16).

NOTE: Pay attention to sequence of discs. Place new friction multiple-discs in ATF fluid for one hour before installing.

8. Insert disc spring (3) and multiple-disc pack (2) in the B2 outer multiple-disc carrier.
9. Insert snap-ring (1).

NOTE: During the measurement the snap-ring (8) must contact the upper bearing surface of the groove in the outer multiple-disc carrier.

10. Measure the B2 clutch pack clearance.





a. Mount Pressing Tool 8901 (1) (Fig. 163) on outer multiple disc.
b. Using a lever press, compress the pressing tool as far as the stop (then the marking ring is still visible).





c. Using a feeler gauge, determine the play "L" (Fig. 164) at three points between the snap-ring (8) and outer multiple-disc (7).
d. The correct clutch clearance is 1.9 - 2.3 mm (0.075 - 0.091 inch) for the four friction disc versions and 2.0-2.4 mm (0.079-0.095 inch) for the five disc versions.
e. Adjust with snap-ring (8), if necessary. Snap rings are available in thicknesses of 2.9 mm (0.114 inch), 3.2 mm (0.126 inch), 3.5 mm (0.138 inch), 3.8 mm (0.150 inch), and 4.1 mm (0.162 inch).