Strange noise in the engine of a Nissan Frontier 3

3 days ago I started to hear a noise similar to the fan touched something, a little more intense the noise until I had to travel en route and in an overtaking at 130 km/h he heard a strong noise as if hammering without losing power, I started slowly and I turned on the oil light, stopped, I started starting and started without problems but with the persistent noise of hammering, what can it be?

Good day friend, that's the chain that goes like this cams have a baquelite skate

The chain is new, has 40000 km, is it necessary to change with the Baquelita skate?

You have to verify well but that trucks when they sound like this is chain