The steel ring gear, which meshes with the starting motor pinion, is shrunk onto the rim of the flywheel.
Repair or Replacement of Ring Gear
Inspection of the flywheel indicated that ring gear replacement is necessary. See Figure
Flowchart for Repair or Replacement of Ring Gear
Removal and Cleaning of Ring Gear
Precleaning is not necessary.
Remove the ring gear as follows:
Using an acetylene torch, cut the ring gear 1/2 to 3/4 of the way through, without allowing the flame to touch the flywheel.
The uncut portion will now yield. Tap the ring gear to remove it from the flywheel.
Installation of Ring Gear
Install the ring gear as follows:
Support the flywheel, ring gear side up, on a solid flat surface.
To avoid injury from burning, use lifting tools and heat-resistant gloves when handling heated components.
Do not under any circumstances, heat the gear over 204C (399F). Excessive heat may destroy the original heat treatment. Heat indicating "crayons" which are placed on the ring gear and melt at a predetermined temperature, may be obtained from most tool vendors. Use of these "crayons" will ensure against overheating the gear.
Rest the ring gear on a flat METAL SURFACE, and heat the gear uniformly with an acetylene torch, keeping the torch moving around the gear to avoid hot spots.
Use a pair of tongs to place the gear on the flywheel with the chamfer, if any, facing the same direction as on the gear just removed.
Tap the gear in place against the shoulder on the flywheel. If the gear cannot be tapped into place readily so that it is seated all the way around, remove it, and apply additional heat.