Hello everyone, so I have been doing research about this lovely v12 and I had a question. I am about to acquire an H.E. out of an 87 XJS, it is supposedly in working order. My question is as the title hints, should I tackle replacing the timing chain and tensioner while the engine is out and on a stand, as sort of preventative maintenance? or should I stick to the old saying of “don’t fix it if it ain’t broke”? I would hate to get it into the car and find out 500 miles later that I should have done it. Are these chains and tensioners known to break? or is it a set and forget kinda deal?