CLIO VAN 1.2
I was driving my valver last week and made a funny noise when pulled away. then oil pressure light came on and the guage was reading nothing. i thought this was my oil pump so have taken engine out but oil pump seems to be working but how do i know for sure? could anything else of caused this to happen. it was running for about thirty seconds-1min could i have done any other damage to the engine?
any ideas

any ideas