Engines with manual transmission usually have a heavy flywheel, typically 5 to 40 kg of cast iron, with the starter band gear shrunk onto the outside.
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 suit between ring equipment inside dia. and flywheel, usually ranging from 0.20mm to 0.50mm, renders the starter ring firmly mounted on the flywheel.

1. Heating must be carried out as uniform as possible rather than with a gas burner, as this planetary gearbox technique causes great temperature variations 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 utilize compressed surroundings or coolant to cool down the ring.

4. A precise centering and flattening of the pieces in the flywheel can be an absolutely essential condition.

5. The original center distance must be maintained.

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

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