how to scale a catpart when scale option is not workin which is converted from catproduct???

i am designing for my project i dont have time to design engine
so i downloaded it
i am using catia
i opend engine on catia, its in assembly mode
i converted into catpart
i want to scale that engine because it is too small for my chassi
and part design scaling option is also not working
how do i scale it to bigger????
please help
see the atttached fileeee