2.4 Timing Chain -s : | platizazvonok.ru
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post #1 of 6 (permalink) Old 09-20-2017, 07:47 PM Thread Starter
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2.4 Timing Chain

Gents;
Just repaired the rear brake line in my 2007 2.4 Sonata with 180K miles. Had to remove the gas tank to get at the line....not fun for an old man. Question, do U gents think it prudent to replace the timing chains and associated hardware on the engine? I drive to see r daughter a few hundred miles away occasionally and don't relish the thought of a timing chain problem....a ways back I had a Pontiac SJ with a 455 engine skip a link in the chain due to stretchage which rendered the motor kaput. Before one of u gents tells me to buy a new car, I already thought of that and would love to do so but after checking the bank account looks like I'll have to make the old Sonata do for awhile longer!
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post #2 of 6 (permalink) Old 09-21-2017, 02:24 AM
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Quote:
Originally Posted by dallam1 View Post
Gents;
Just repaired the rear brake line in my 2007 2.4 Sonata with 180K miles. Had to remove the gas tank to get at the line....not fun for an old man. Question, do U gents think it prudent to replace the timing chains and associated hardware on the engine? I drive to see r daughter a few hundred miles away occasionally and don't relish the thought of a timing chain problem....a ways back I had a Pontiac SJ with a 455 engine skip a link in the chain due to stretchage which rendered the motor kaput. Before one of u gents tells me to buy a new car, I already thought of that and would love to do so but after checking the bank account looks like I'll have to make the old Sonata do for awhile longer!
Timing System diagram attached, looks like a lot of work to replace the timing chain, let me know if you need further info for the timing system.
Attached Files
File Type: pdf Timing System.pdf (274.4 KB, 8 views)
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post #3 of 6 (permalink) Old 09-21-2017, 07:01 AM Thread Starter
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Although, I was hoping for a recommendation to replace the chains r not, no one really knows what shape their in. I could take off the valve cover and pull on the chain but even taking off the v/cover is a lot of work if it's not necessary. Got some deciding to do but I saw a timing chain kit on sale for 80 bucks...might go ahead and buy it for surely, if not now, down the road I'll need to replace them.
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post #4 of 6 (permalink) Old 09-21-2017, 07:12 AM
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I recently replaced the timing chain on my wife's '08 at 150k miles as a preventative measure. I was worried about the chain collision with the oil jet that seems to happen sometimes with these engines. What I found was that the chain had stretched by 1/8" (when doubled, so 1/4" over its full length). It still wasn't close to hitting the oil jet. I replaced the tensioner and guide rails as well but those looked to be in very good shape also. The groves in the guides were less that .005" deep I would say.

We got the car with 115k on it, so I don't know the full history. CarFax showed that the oil had been changed every 5k. I have used synthetic oil since I have had it.

The engine has always run very smoothly, but with the new chain it is even better. Before it would need to be cranked a second or so before it would start when the engine was warm. Now it catches right away. On the highway the engine has better torque now and will climb hills without unlocking the torque converter where it would need to unlock before. The gas mileage on the highway is about the same, 32 mpg at about 70 mph before and after.

So I would say if it has had regular oil changes over its life and never been run low on oil, you probably aren't in danger of harming anything by leaving the timing chain alone. Be alert for chain noises or DTCs that indicate timing problems and you should be OK.

Last edited by Optiker; 09-21-2017 at 07:32 AM.
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post #5 of 6 (permalink) Old 09-21-2017, 10:20 AM Thread Starter
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Quote:
Originally Posted by Optiker View Post
I recently replaced the timing chain on my wife's '08 at 150k miles as a preventative measure. I was worried about the chain collision with the oil jet that seems to happen sometimes with these engines. What I found was that the chain had stretched by 1/8" (when doubled, so 1/4" over its full length). It still wasn't close to hitting the oil jet. I replaced the tensioner and guide rails as well but those looked to be in very good shape also. The groves in the guides were less that .005" deep I would say.

We got the car with 115k on it, so I don't know the full history. CarFax showed that the oil had been changed every 5k. I have used synthetic oil since I have had it.

The engine has always run very smoothly, but with the new chain it is even better. Before it would need to be cranked a second or so before it would start when the engine was warm. Now it catches right away. On the highway the engine has better torque now and will climb hills without unlocking the torque converter where it would need to unlock before. The gas mileage on the highway is about the same, 32 mpg at about 70 mph before and after.

So I would say if it has had regular oil changes over its life and never been run low on oil, you probably aren't in danger of harming anything by leaving the timing chain alone. Be alert for chain noises or DTCs that indicate timing problems and you should be OK.

Thats what I was looking for....someone who's done the change and gives an observation of the parts...thanks. If your chain stretched 1/4 inch and not interfered with the oil jet thingy then it looks to me the tensioner is working correctly. Since I've always changed my oil at the 3K mark there's a good chance my chain innards r close to the same as your's. I do like the fact you state you have a noticeable improvement in torque...I suppose it's because your timing is more on the mark. I am going to go ahead and buy the kit and decide, based on your post, when to install it. Incidentally, I've had my car since 33K...it now has 187K miles.....I have always gotten 29 miles to the gallon. No matter what I've tried the mpg has never touched the 30s. I think thats because at 70-75 miles an hour on the highway my tach reads close to 3K.....my car is a manual...while the automatic cars r around 2.2K....I ask drivers of similar cars with automatics (99%) and they tell me 32mpg at a little over 2K rpm on the highway.
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post #6 of 6 (permalink) Old Yesterday, 07:32 AM
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If your car's timing chain is this loose, it must be replaced. There should be no slack at all!
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