George Russell is forced to change his power unit ahead of the Hungarian Grand Prix after an issue during qualifying. According to reports, a crack in his engine leads to a water leak in the qualifying session, prompting the team to replace the power unit before the race. The replacement is a response to the cooling problem caused by the leak, aimed at ensuring the car can operate safely and reliably for race day. The incident occurs after Russell’s qualifying performance, when the engine-related crack is identified and the leak becomes evident. As a result, his preparations for the Hungarian GP include the required component change, with the team moving from diagnosis to replacement to avoid further damage. The reports do not indicate a different cause beyond the cracked engine and the resulting water leak during qualifying.