Differential Gears

Fig. 28 Checking Differential Gear Clearance:

1. Measure thickness of the conical springs and record values.
2. On non-turbo models, assemble the following components:
a. Spider and thrust block, if equipped.
b. 2 pressure rings.
c. 4 friction plates.
d. 4 friction discs.
3. On turbo models, assemble the following components:
a. Spider.
b. 2 pressure rings.
c. 2 friction plates.
d. 4 friction discs.
4. On all models, using a micrometer, measure dimension L 1 excluding the conical spring, Fig. 28.
5. Check clearance No. 1 by subtracting the value and dimension obtained in steps 1 and 4, respectively, from dimension A, Fig. 28. Dimension A is 3.3070 inch (84mm) for RX-7 non-turbo, 3.5827 inch (91mm) for RX-7 turbo or 3.5886 inch (91.1mm) for B2200 and B2600.
6. If clearance is too great, adjust with oversize friction disc. Standard clearance, .0020-.0079 inch (.05-.20mm) for RX-7 non-turbo and B2200 and B2600 or .0039-.0098 inch (.10-.25mm) for RX-7 turbo. Oversize disc thickness, 0.0827 inch (2.1mm) for RX-7 or .073 inch (1.85mm) for B2200 and B2600.
7. Assemble pressure rings, side gears, spider with pinion gears and thrust washers.
8. Using a micrometer, measure dimension L 2.
9. Check clearance No. 2 by subtracting L 2 dimension obtained in step 8 from dimension B, Fig. 28. Dimension B is 3.4724 inch (88.2mm) for RX-7 non-turbo, 3.7008 inch (94mm) for RX-7 turbo or 3.7057 inch (94.1mm) for B2200 and B2600.
10. If clearance is too great, adjust with oversize thrust washer. Standard clearance, .0039-.0157 inch (.10-.40mm) for RX-7 turbo and B2200 and B2600. Oversize thrust washer, 0.0709 inch (1.8mm) for RX-7 or .063 inch (1.60mm) and .067 inch (1.70mm) for B2200 and B2600.