Italian GP: Mercedes clears Hamilton's engine after Rosberg problem

Lewis Hamilton has been cleared to use Mercedes' new Formula 1 engine in the Italian Grand Prix after the cause of team-mate Nico Rosberg's Saturday problem was identified

Italian GP: Mercedes clears Hamilton's engine after Rosberg problem

Mercedes used all seven of its tokens as part of an upgrade for this weekend, but the team was forced to revert to a previous spec on Rosberg's car after finding a problem following final practice at Monza.

ANALYSIS: Mercedes' engine upgrades moves the goalposts

Team principal Toto Wolff admitted there was a big question mark over what the problem was and whether Hamilton would be able to race the unit.

But after overnight investigations at the track, the team concluded there was a leak in the cooling system and not a problem with the unit itself.

As a result, the reigning world champion is clear to race with the new engine.

"Overnight investigation has revealed the cause of Nico Rosberg's problem in Italian GP FP3 yesterday," tweeted Mercedes.

""This was traced to a leak in the cooling system which contaminated the power unit, not a problem with the engine itself.

"The power unit will be inspected in the coming days to decide if it can be used again at future races."

Hamilton starts Sunday's race from pole - his seventh in succession - with Rosberg fourth behind Ferrari's Kimi Raikkonen and Sebastian Vettel.

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