Drive Pinion

Fig. 3 Pinion Components. Except RX-7:

Fig. 4 Zeroing Dial Indicator:

1. Ensure differential bearing support bores are clean and free of burrs.
2. Install front and rear (center and rear on RX-7) bearing outer races into differential carrier.
3. On all models, except RX-7, proceed as follows:
a. Place a spacer (3), rear bearing (4) and collar B (49 8531 568 for models except B2200 and B2600; 49 H027 001 for B2200 and B2600) onto drive pinion model (49 8531 568 for models except B2200 and B2600; 49 8531 565 for B2200 and B2600) and secure them with O-ring (6), Fig. 3.
b. Install assembly into carrier, ensuring head of pinion model is secure. Do not install collapsible spacer.
c. Install front bearing (8), collar A (49 8531 567 for models except B2200 and B2600; 49 H027 001 for B2200 and B2600) companion flange (9) and washer (10).
d. Install nut and tighten so model turns smoothly.
4. On RX-7 models proceed as follows:
a. Install rear bearing, spacer and drive pinion model (49 F027 001). Install center bearing, long collar, companion flange, washer and nut.
b. Tighten nut so drive pinion model can still be turned by hand.
5. On all models, install dial indicator to gauge body. Place gauge body on surface plat, Fig. 4, then ``zero'' the dial indicator.
6. Place gauge block (49 0660 555 for RX-7 turbo and B2000, B2200 and B2600 w/P size differential; 49 0305 555 for RX-7 non-turbo and B2200 and B2600 w/M size differential) on drive pinion model and carefully place the gauge body adjusted in step 5 on gauge block so feeler of indicator comes in contact with lowest portion of differential bearing support bore.
7. Measurement should be taken on each bearing support bore. Record an average of reading:
a. If average is on plus side, use a spacer which is thicker by the plus value than the spacer used in step 3 or 4.
b. If average is on minus side, use a spacer which is thinner by the minus value than the spacer used in step 3 or 4.
8. Remove the gauge body and dial indicator, and check zero setting on the surface plate to make sure setting was not disturbed by handling.
9. To compensate for machining variables, the pinion has a number recorded in hundredth millimeters on the pinion face of the tapered end.

Fig. 5 Pinion Spacer Chart. One-piece Case Differential:

Example:
2 = +0.02mm (+0.0008 in.)
-1 = -0.01mm ( -0.0004 in.)
a. If the pinion is marked with a plus number, subtract the specified amount on the pinion face of the tapered end from the amount determined in step 7.
b. If the pinion is marked with a minus number, add the specified amount on the pinion face of tapered end to the amount determined in step 7.
10. Select a pinion spacer within a tolerance of + or - 0.0012 in. (0.03mm) from table, Fig. 5.