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 placed onto the flywheel, often held in firmly against a spot 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 ring firmly attached to the flywheel.

1. Heating must be carried out as uniform as feasible and never with a gas burner, as this technique causes great temperature differences to the pieces.

2. the temperature ought to 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 off 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. Frosty power press system ought to be avoided because of to a substantial planetary gearbox tension caused to the hardened region.

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