Engines with manual transmitting usually have a heavy flywheel, typically 5 to 40 kg of cast iron, with the starter band gear shrunk onto the exterior.
That 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 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 completed as uniform as feasible and never with a gas burner, as this 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 make use of compressed air or coolant to cool down the ring.
4. A precise centering and flattening of the parts in the planetary gearbox flywheel can be an absolutely essential condition.
5. The initial center distance should be maintained.
6. Frosty power press system should be avoided due to a substantial stress caused to the hardened region.
Engines with automated transmissions instead possess a pressed steel plate with the starter ring gear usually welded onto the exterior of the plate.