In some cases, a rattle within the entrance from the engine doesn’t always signify the VCT gear is worn out. The timing chain guide around the SR20 and KA24 engines is thought to loosen and rattle, knocking about the valve go over given that the timing chain moves beneath it. https://jdmnissansr20turboenginef92458.answerblogs.com/32173327/jdm-nissan-sr20-turbo-engine-for-sale-things-to-know-before-you-buy