Hi, I’ve just bought an l512s Mira AvanzatoR4. It has a 4 cylinder turbo-charged jb-jl engine, and my largest concern with the car right now is that there is some noticeable engine noise coming from the right side of the car, where the pulleys and camchain are located.
My plan going forwards would be to remove the belts to see if this might be related to one of the pulleys, after that I suppose I might have to take a look at the timing chain/tensioner/guides? I’m also going to change the oil because idk how old it is and I’d like to know if there’s any metal in there.
Anyhow, I was wondering if this engine is known for any timing issues, or if the chain ever needs to be replaced? My assumption was that timing chains usually last the life of an engine.
Also, from the photos I’ve seen of the valve cover removed, it seems that only the exhaust cam is actually driven by the chain, and it has a gear which drives the intake cam. Would this be any noisier than a typical dohc engine?