An executive with the main contractors, United Engineers (Malaysia) Bhd (UEM), said the three million ringgit ($785,000) in damage to the public address and scoreboard control systems jeopardised plans to have the stadium ready for pre-game events in July.
It was the third act of vandalism in two weeks at the gymnastics stadium which, along with a 100,000-seat athletics stadium, swimming facilities, hockey stadium and squash courts, is in the final stages of preparation.
UEM had planned to hand over the 13,000-seat gymnastics stadium to the Youth and Sports Ministry at the end of the month, well ahead of the official opening of the new venues and start of the pre-games competition on July 11.
UEM spokesman Mr Azmi said "This will definitely have an impact on the handover,"
bt he added that the gymnastics stadium would be ready in time for the 16th Commonwealth Games, set for September 11-21.
The vandals opened joints in the sprinkling system in the stadium's control room, damaging the equipment.
The two previous incidents had caused minor damage. After the second incident last week, authorities deployed about 40 police at the complex, where about 150 people are working.
Some 6,000 athletes and officials from at least 65 countries are expected to participate in September's games.
The government has spent $1.7 billion ringgit ($445 million) on facilities, including one billion ringgit for the athletics, swimming and gymnastic stadiums which are at the heart of the games complex some 25 km (15 miles) south of downtown Kuala Lumpur.
Commonwealth Games organisers said that except for the delay in the transfer of the gymnastics venue, all other facilities were on time.
Vandals have damaged equipment at a new indoor gymnastics stadium being built for September's Commonwealth Games, delaying the transfer of the complex to Malaysian authorities by at least a month.
