mayweathers82

recently i was having an overheating isue and thanks to the help of you guys i fixed the problem. i changed the thermostat, filled the coolant (using burping method and had the front raised) i still need to get a new exhaust but my concern comes from this weird noise coming from the left side of the engine. its not loud but its sounds kinda like a knock/rattle sound (i will post a clip in the morning) i know my powersteering needs to be replaced but i think it may be the timing chain, is that a common problem for 95 maximas? i have 184k miles. i can feel it when i put my hand on top of the engine. any thoughts??