The world champion suffered near identical MGU-H failures in qualifying for China and Russia, which has hampered his bid to overhaul teammate Nico Rosberg.

Mercedes has conducted a thorough examination of the issues he has suffered and, in a bid to minimise the chances of another problem, it has tweaked the MGU-H design to try to sort out the problems.

Having worked against the clock to get the improved design ready for the Barcelona weekend, the new component will be fitted to Hamilton's car in time for free practice on Friday.He will also get a new turbo.

It will be Hamilton's fourth MGU-H of the season, which means he will only have one more available for the remainder of the campaign before he could face a grid penalty

Rosberg old design

Rosberg is sticking with the original MGU-H and turbo designs for the Spanish Grand Prix, with those components having lasted beyond the mileage where the failures on Hamilton's system occurred.

The team is hopeful that those components are not at risk of suffering the kind of problem that hit Hamilton, although is likely to switch the German on to the new design at forthcoming races.

Rosberg is, however, moving on to his second internal combustion engine and MGU-K for the Spanish Grand Prix weekend.