Looking at buying a 97 4runner. auto. got the 3.4 liter v6.
timing belt was changed 120 000 miles ago. It currently has 233 000 miles on it.
He says it's never burned or leaked oil.
He's owned it for three years never had a problem.
Am i right to think the timing belt has to be changed pretty much right away? And should I be thinking head gasket?
Are these big jobs?

Thanks for any help.