SUZUKA (Japan) (Reuters) - Lewis Hamiltons Japanese Grand Prix nightmare intensified on Saturday when McLaren said their Formula One title contender would have a five-place penalty on the starting grid for a gearbox change. In P3 (final practice) today, we noticed abnormal gearbox oil pressure on Lewiss car which we believed we had corrected ahead of this afternoons qualifying session, the team said in a statement. This afternoon, as we fired up Lewiss car several times in preparation for qualifying, we became aware that the symptoms were worse than wed originally diagnosed. A decision was later taken to change the gearbox ahead of tomorrows qualifying session and the grand prix. As a result, Lewis will receive a five-place grid penalty for tomorrows race. Qualifying could not take place on Saturday due to heavy rain at Suzuka and was postponed to Sunday morning. Hamilton, the 2008 champion who has failed to finish three of his last four races, has completed only a handful of laps so far after crashing in Fridays first practice and missing most of the second. Like most drivers, he failed to set a timed lap in Saturdays final session. Hamilton is third overall, 20 points behind Red Bulls championship leader Mark Webber with four races remaining including Sunday.