Engines with manual transmitting usually have much flywheel, typically 5 to 40 kg of cast iron, with the starter ring gear shrunk onto the exterior.
This is done by heating the ring to around 200 °C to expand the ring which is then rapidly positioned onto the flywheel, often held in firmly against a spot 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 performed as uniform as possible rather than with a gas burner, as this process causes great temperature distinctions to the pieces.
2. the temperature should be 200°C. A temperature greater than 350°C will affect the gear tooth hardness.
3. Do not utilize compressed air flow or coolant to cool down the ring.
4. An accurate centering and flattening of the items in the flywheel is an absolutely essential planetary gearbox condition.
5. The initial center distance should be maintained.
6. Cold power press system should be avoided due to a substantial stress triggered to the hardened region.
Engines with automatic transmissions instead have a pressed steel plate with the starter ring equipment usually welded onto the exterior of the plate.