Engines with manual tranny usually have a heavy 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 location shoulder until coolin in calm air . The interference match between ring equipment inside dia. and flywheel, usually which range from 0.20mm to 0.50mm, renders the starter band firmly attached to the flywheel.

1. Heating must be carried out as uniform as feasible rather than with a gas burner, as this technique causes great temperature differences to the pieces.

2. the temperature should be 200°C. A temperature greater than 350°C will affect the apparatus tooth hardness.

3. Do not make use of compressed atmosphere or coolant to cool off the ring.

4. An planetary gearbox accurate centering and flattening of the parts in the flywheel is an absolutely essential condition.

5. The original center distance must be maintained.

6. Chilly power press system should be avoided due to a substantial stress caused to the hardened region.

Engines with automatic transmissions instead have a pressed metal plate with the starter ring gear usually welded onto the outside of the plate.