Q: I'm not sure if I need a new timing belt & if I do, is it worth to get fixed?

Your Explorer’s 4.0 liter V6 is equipped with a timing chain, not a timing belt. While timing chains have a finite lifespan and should definitely be changed at a regular interval (usually around 60k miles), timing chains will usually last the entire life cycle of the vehicle. On this engine, however, the timing chain guides can wear prematurely and lead to the ticking noise you describe. Ford has issued a service bulletin on this issue and has released a redesigned, improved timing chain “cassette” that includes the chain, upper and lower gears, guide and tensioner assembly.

This assembly can be replaced with the engine still in the vehicle. It’s important to have this service done – a failed timing chain tensioner can come apart and send debris into the oil pan. Other causes for a clicking or ticking noise can be a fuel injector or lifter noise, but given the reputation of this engine, the timing chain angle is worth pursuing. To have this done, consider YourMechanic, as a certified technician from YourMechanic can perform a timing chain replacement and full diagnosis of the noise and any other issues.