What causes the timing chain of a Nissan altima 3.5SE V6 to start giving a strange sound?

Actually the chain guide wears away at the chain tension devices in each head. Nissan Replaces all three chains and two chain tension shoes. I also recommend any worn guides be done while the timing chain cover is off. At your car mileage I would also replace the water pump too. Whirring whining buzzing noise is steel to chain noise don't wait to long. Other high mileage parts think about doing two radiator hoses thermostat and radiator with a new cap any power steering hoses that may be leaking, valve cover gaskets and fan belts too . Motor and power train assembly must be dropped out the bottom to properly perform the timing chain work on a front wheel drive Altima. Make sure your technician has done this job so they will know exactly what to do.

2005 Nissan Altima V6

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What causes the timing chain of a Nissan altima 3.5SE V6 to start giving a strange sound?

I give my mechanic my car for routine change of oil and the filter and before he gets to the dealership, he's called and tells me the timing chains malfunctioning and i say whats the cause and he doesn't know. I have 193K on mileage. How long can i use it before replacing it cause $2000 is...

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I'm not an Altima expert, but if I were doing the job I'd start by removing belts. Then it's likely you'll have to remove the main pulley from the crank shaft. You'll probably need to rent (for free at auto zone and some other auto parts stores) - you'll probably need to rent a pulley puller. If you have a bolt holding the main pulley on you'll need to remove that first. It's likely you don't have that size socket - so be ready to spend a little money buying tools you'll need for the job. Once you've loosened that bolt take it all the way out. Then put it back in at least six full turns. FULL turns, not six turns of the fingers. You'll need to put the pulley puller against something for pulling the main pulley off. If you don't back that bolt out far enough you won't be able to get the pulley off. If you back it out TOO far you could damage threads when you attempt to remove the pulley. Balance is needed. Once the pulley is off you can remove the timing cover. It's likely (but remember I'm no expert with Altima's) you have 10 mm and 12 mm bolts to loosen in order to get the timing cover off. There's also probably an oil seal on the cover that goes around the crank shaft. Be careful not to damage the seat of that seal. Otherwise you'll have leaks. But it's doable, don't be frightened by the job. Take it slowly and keep sandwich bags for hardware handy. Use a marker to mark on the bag where the bolts come from. Bolts from different things should be placed and marked in different bags. That is to say - every bolt that came off from the timing cover should go into a bag marked "Timing Cover". Every bolt that comes off from things like the water pump or the belt tensioner should each have their own bag. Whenever you replace a timing belt ANYTHING that is under the cover should be replaced. You may think that the crank shaft position sensor is working fine, and maybe it is. But if you've gone far enough to have to replace the chain then likely your sensor is nearing the end of its life. Think about how hard it has been to get this far. Want to do all that again just for a sensor? Probably not. Get a Childress or a Haynes manual and refer to it to know how to put things back together - it's critical. Do it wrong and you're doing it over. Aside from some specialty tools and some specialty knowledge - you should be able to handle the job just fine. I've done a dozen timing belts and/or chains in my life time. A few of them were even my own vehicles. Hope this helps. 'av'a g'day mate. ")

If it went out while running, there are probably more problems than just the timing chain if its not an overhead cam. But the first thing you will have to do is get the timing cover off and get the timing marks lined up. If it is an overhead cam, there may be a tool to hold it in place while installing the timing chain. And you would do yourself a great favor by purchasing a repair manual if your going to do this yourself. It will guide you through all the proper procedures.

Nissan 3.5 Timing Chain

Chain has stretched beyond the limit that its tensioner can take up.

OR the tensioner is not working.

No way of knowing how long it will be OK for - could be 1000s of miles and could be 10.

If it breaks or jumps you will need a new engine.

why is your mechanic taking your car to the dealership?

well said gentlemen!