George Russell was forced to replace his power unit ahead of the Hungarian Grand Prix after a crack in the engine caused a water‑pressure loss during qualifying. The British driver, who had posted a modest seventh‑place time, will actually line up sixth on the grid because his teammate, Kimi Antonelli, received a three‑place grid penalty for exceeding the speed limit in the pit lane. The issue surfaced at the very end of Q3 when the Mercedes team detected a sudden drop in water pressure. Engineers concluded that a fissure in the power‑unit casing had allowed coolant to escape, prompting the decision to fit a fresh unit.
This will be Russell's fourth power unit of the 2026 season, but because the replacement is of the same specification and does not exceed the four‑engine allowance, he will escape any further grid penalty. Mercedes suspect the leak originated when Russell rode over the exit kerb at Turn 4 on his final flying lap. The impact likely damaged a seal, leading to the coolant loss that forced him to abort the lap. "We lost water pressure and I had a water leak.
When I stopped on track, the car was leaking a load of water," Russell told Sky Sports F1. He added, "Fingers crossed it doesn't affect anything for the race." The incident adds to a string of reliability setbacks that have plagued Mercedes this year. Both Russell and Antonelli have suffered engine‑related retirements, costing them valuable championship points. Russell, who trails the championship leader by 50 points, was left "speechless" after the previous round in Belgium when a software bug in the power unit stripped him of straight‑line speed and ultimately led to a race‑ending collision with Lewis Hamilton at Spa‑Francorchamps.
Mercedes technical director Simone Resta explained that the software flaw was common to all of the team's cars, but its impact was more pronounced on Russell because Antonelli was running a newer, fresher power unit. "The software is the same for all the cars, and it was there in every car, but it affected George more than Kimi," Resta said.
He also noted that a newer engine generally delivers a performance edge, which explains part of the pace disparity between the two drivers. "That will change in the next races when we start to have a fresher power unit on George's side. So, there's a bit of everything – software, engine age, and the way each driver’s programme is phased." In the qualifying results, the top ten were: 1) Lando Norris (McLaren), 2) Charles Leclerc (Ferrari), 3) Oscar Piastri (McLaren), 4) Max Verstappen (Red Bull), 5) Lewis Hamilton (Ferrari), 6) George Russell (Mercedes), 7) Kimi Antonelli (Mercedes), 8) Isack Hadjar (Red Bull), 9) Arvid Lindblad (Racing Bulls), 10) Nico Hulkenberg (Audi).
Even before the water‑leak incident, Russell had been struggling to match Antonelli's pace throughout the European swing. The gap between the teammates has persisted, and Russell will now start the race a single grid spot ahead of his rookie teammate. He hopes to chip away at the 50‑point deficit, but he cautioned that closing the gap to the podium will be a steep climb.
"We were probably even further off on Friday but we had the strongest race pace, which suggests it's not a car problem but a tyre problem," he observed. Russell also reflected on the balance between qualifying and race setups. "Time will tell in the race if we struck the right balance between the qualifying setup and race setup. We probably know we could make the car faster in qualifying trim at the expense of race performance.
It's going to be difficult to overtake. It would have been nice to be higher up," he said. The Hungarian Grand Prix weekend schedule is packed: a F3 feature race at 7:35 am, Porsche Supercup at 9:05 am, F2 feature race at 10:20 am, followed by build‑up coverage from 12:30 pm, the main race at 2:00 pm, and post‑race analysis later in the afternoon.
All sessions will be broadcast live on Sky Sports F1 and Sky Sports Main Event, with streaming available via NOW for viewers without a traditional contract. Overall, Russell faces a challenging weekend. He must manage a freshly installed power unit, adapt to the lingering effects of the water leak, and extract maximum performance from a car that has shown inconsistent pace relative to his teammate. With the championship battle intensifying, any points gained in Budapest could prove pivotal, while any further setbacks may widen the gap to the series leaders.