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Speeding up generator set cat c32 from 50hz to 52 hz

We have in our site genset cat c32, this generator is rated for 50hz , when we sped up this generator to 52 , we have problem with radiator leakage many times and the leakage internal in its piping. we repaired the leakage and speed down it again to 50hz , it work good now, my question what happened to get that leakage inside the radiator, I think the vibration is not the problem, we have concern about speeding up the cooling water pump would be the problem is that right
Can any one tell me the readon