INSTRUCTIONS FOR RING GEAR FLYWHEEL MOUNTING
Engines with manual transmission usually have a heavy flywheel, typically 5 to 40 kg of cast iron, with the starter ring gear shrunk onto the outside.
This is done by heating the ring to around 200 °C to expand the ring which is then rapidly placed onto the flywheel, often held in firmly against a location shoulder until coolin in calm air . The interference fit between ring gear inside dia. and flywheel, usually ranging from 0.20mm to 0.50mm, renders the starter ring firmly attached to the flywheel.
1. Heating must be done as uniform as possible and never with a gas burner, as this process causes great temperature differences to the pieces.
2. the temperature should be 200°C. A temperature higher than 350°C will affect the gear tooth hardness.
3. Do not make use of compressed air or coolant to cool down the ring.
4. An accurate centering and flattening of the pieces in the flywheel is an absolutely essential condition.
5. The original center distance must be maintained.
6. Cold power press system should be avoided due to a substantial stress caused to the hardened area.
Engines with automatic transmissions instead have a pressed steel plate with the starter ring gear usually welded onto the outside of the plate.