Originally Posted by smj999smj
It depends on what's wrong with the old chain and why are you changing it? If you are overhauling an engine, it would be a good idea to replace those parts. If the chain jumped, it would depend on the damage. If you are looking at preventative, maintenance, the only part that seems to fail is the upper timing chain tensioner; it's a lot simpler and cheaper to just replace the upper tensioner than to replace the entire upper and lower chains, gears, etc.
First off, Thank you for your response, I know a lot of people don't like dealing with newbies at many sites.
The car started making a noise in the engine left side as your looking at it from the front of the car, strange noise, almost like a chain but not quite, My wife was driving the car home and it got louder, she pulled into the driveway and shut it off, told me what she had heard, I went to start the car and it turns over but acts like it is out of time, and will buck after a few seconds, I turned it off, called a friend, and tried again, same result, shut it off, and we came to the conclusion it was timing and most likely the timing chain had gone bad, it has over 200k on the engine.
It has not been torn down yet, I did take the valve cover off, and looked at the valves and they seem ok, and the small chain on the left connecting the two cams seemed fine,(tight).
I have a call into my mechanic, to come get the car and check it out but was wondering what an average cost for this would be. this is my first and only Non-American car, I am a Chevy person myself, and am not accustom to side mounted engines, my other vehicle at the moment is a 1991 Chevy Blazer, much simpler to work on IMHO but now I am into this with my wife's car and need some background info on Nissan Engines.
The car has been in the family since new, and was never abused, my wife has had it for 8 years without any problems, regular service etc, it was my Grown Son's before that but he outgrew it with children, BTW he is soon to be home from Kuwait, we think 10 more days and he will hit the States for debriefing then home YES! 3rd tour there!
I will keep in mind what you told me about the "upper timing chain tensioner" great tip thanks!