Although the word "flywheel" is commonly used, only vehicles equipped with a manual transaxle/transmission have one. Those equipped with an automatic transaxle/transmission utilize a drive plate assembly (or "flexplate").
REMOVAL & INSTALLATION
See Figures 1 and 2
- Turn the engine so that the No. 1 piston is at TDC. Remove the transaxle/transmission, as described in Drive Train .
- Install a device to lock the flywheel/flexplate, such as Mazda Part No. 49 E301 060 or equivalent. (On the 2.0L engine, use Mazda Part No. 49 V101 060 or equivalent). Such devices typically bolt to the rear engine plate. Install the device in the direction which will keep the flywheel/flexplate from turning as the mounting bolts are turned.
If such a locking device is unavailable, thread a bolt partway into the engine block (to serve as a fulcrum), then carefully wedge a screwdriver or similar tool between the ring gear teeth and the bolt.
- If equipped with a manual transaxle/transmission, remove the clutch as described in Drive Train .
- Support the flywheel/flexplate in a secure manner. Unfasten the bolts, then remove the assembly. Run the appropriate size metric tap through each bolt hole to ensure proper thread contact. Wire brush the bolts to remove any dirt or grease from the threads.
- On the 323, 626, MX-6 and 929, coat the bolt threads with a sealant, such as Mazda part No. 8530 77 743 or equivalent. Position the flywheel/flexplate, then install the bolts loosely.
- Turn the locking device around so the bolts may be torqued without turning the flywheel/flexplate. Torque the bolts to specification.
- If applicable, install the clutch as described in Drive Train .
- Install the transaxle/transmission as described in Drive Train .
RING GEAR REPLACEMENT
The ring gear can only be replaced separately on those vehicles with a flywheel. On vehicles with a flexplate, the ring gear is integral.
See Figure 3
- Remove the flywheel as previously described. Use a torch, confining the flame carefully to the ring gear itself, to heat and expand the ring gear. Then, support the flywheel at its center and tap the ring gear all around to remove it.
- Put the new ring gear in an oven and heat it to 480°-570°F (249°-299°C). Give the ring gear plenty of time to rise to the oven temperature (at least 20 minutes).
- Position the ring gear with the beveled side facing the engine side of the flywheel. Then, work it evenly onto the flywheel using a short piece of 2 x 4 lumber and a hammer. Install the flywheel as previously described.