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Do our timing belts last forever? cant find large number of people who broke them

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Old 06-09-15, 07:21 PM   #1
sc430faste
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Default Do our timing belts last forever? cant find large number of people who broke them

I did a search already and came up with one sc430 who broke their timing belt, it looks like their radiator hose broke and took the timing belt with it. I also searched the LS430 forum and only one person broke theirs because they used aftermarket parts for the timing belt replacement.

It looks like our timing belts pretty much last forever? I am at 155k miles and I do not know if the previous owners changed it yet, I know I am pushing the luck train but I do not feel like it would break given that I do not hear about it breaking much online compared to other cars like the acura MDX etc
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Old 06-09-15, 10:00 PM   #2
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....I would try to do some research on the car's previous maintanance history & see if i could find out. The number of miles that you get out of the timing belt could vary drastically,depending on alot of factors.I would change it more for insurance & peace of mind.Why take a chance on replacing an engine or becoming #2 on your list
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Old 06-10-15, 01:19 AM   #3
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A second on what Tex said!!!

Why are you NOT interested in changing these vital engine parts?

It could be that Lexus drivers are more aware and have the resources to maintain their vehicles.

If you decide to ignore this maintenance, please do me a favor and let me know how many miles you were able to go before the engine destroyed itself.
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Old 06-10-15, 02:19 AM   #4
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A radiator hose broke the timing belt? Or do you mean serpentine belt?
The timing belt is inside the engine behind covers.

At 155k if it has not been serviced before you are overdue for the timing belt service, but the timing belt is not the problem.

Lexus timing belts almost never, never break on their own. What does break Lexus timing belts are seized water pumps, broken tensioners or broken idler pulleys. Once one of these components goes it will take the timing belt with it (and of course valves get smashed by pistons).

The largest reason to change your timing belt is so you can change the water pump, idler pulleys and belt tensioner, removing these potential failure points. The belt has to be removed to change all of these things and the belt is included in the kit, so it gets changed too.

Never let a repair shop talk you into just changing the timing belt. Change it all to remove the real failure points.

I did mine last year and didn't think it was a bad DIY. Time consuming because of all of the crap you need to remove. The important thing is to pay attention to camshaft locations and turn the engine by hand to make sure the timing is correct.
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Old 06-10-15, 08:25 AM   #5
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Quote:
Originally Posted by SC43052 View Post
Lexus timing belts almost never, never break on their own. What does break Lexus timing belts are seized water pumps, broken tensioners or broken idler pulleys. Once one of these components goes it will take the timing belt with it (and of course valves get smashed by pistons).

The largest reason to change your timing belt is so you can change the water pump, idler pulleys and belt tensioner, removing these potential failure points. The belt has to be removed to change all of these things and the belt is included in the kit, so it gets changed too.


In your case, because u not sure when/if was changed, regularly inspect the serpentine belt, if u see cracks, its over due!
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Old 06-11-15, 05:06 AM   #6
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I don't know where anyone would ever have enough data, or any data for that matter, to say the belts don't break. If people maintain the cars the belts will be much less likely to break of course. There is no database any of us here can access that would show the number of cars, their mileage, their belt maintenance info and their failure rates in both cases. If someoen doesn't want to change the belts fine. it's pointless to ask others to speculate on whether your belt might break.
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Old 06-11-15, 05:15 AM   #7
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Quote:
Originally Posted by SC43052 View Post
A radiator hose broke the timing belt? Or do you mean serpentine belt?
The timing belt is inside the engine behind covers.

At 155k if it has not been serviced before you are overdue for the timing belt service, but the timing belt is not the problem.

Lexus timing belts almost never, never break on their own. What does break Lexus timing belts are seized water pumps, broken tensioners or broken idler pulleys. Once one of these components goes it will take the timing belt with it (and of course valves get smashed by pistons).

The largest reason to change your timing belt is so you can change the water pump, idler pulleys and belt tensioner, removing these potential failure points. The belt has to be removed to change all of these things and the belt is included in the kit, so it gets changed too.

Never let a repair shop talk you into just changing the timing belt. Change it all to remove the real failure points.

I did mine last year and didn't think it was a bad DIY. Time consuming because of all of the crap you need to remove. The important thing is to pay attention to camshaft locations and turn the engine by hand to make sure the timing is correct.
great advice !
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Old 06-12-15, 03:31 PM   #8
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Quote:
Originally Posted by SC43052 View Post
A radiator hose broke the timing belt? Or do you mean serpentine belt?
The timing belt is inside the engine behind covers.

At 155k if it has not been serviced before you are overdue for the timing belt service, but the timing belt is not the problem.

Lexus timing belts almost never, never break on their own. What does break Lexus timing belts are seized water pumps, broken tensioners or broken idler pulleys. Once one of these components goes it will take the timing belt with it (and of course valves get smashed by pistons).

The largest reason to change your timing belt is so you can change the water pump, idler pulleys and belt tensioner, removing these potential failure points. The belt has to be removed to change all of these things and the belt is included in the kit, so it gets changed too.

Never let a repair shop talk you into just changing the timing belt. Change it all to remove the real failure points.

I did mine last year and didn't think it was a bad DIY. Time consuming because of all of the crap you need to remove. The important thing is to pay attention to camshaft locations and turn the engine by hand to make sure the timing is correct.
^100% solid advice.

Check out my timing belt change thread, I got the car at 87k and did not know the condition. When I took it apart I found that the belt WAS changed but the water pump WAS NOT changed. I took a few pics of all the red crust that was coming out of the weep hole and slowly filling up the engine with crusty dried coolant, perhaps this is just because the previous owner let the coolant get too old but regardless I'm happy I did the work and got it changed out. Engine also seams a little smoother to me because of the new bearings/idlers.
Click the image to open in full size.


Click the image to open in full size.
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Old 06-12-15, 06:49 PM   #9
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You bring up a great point Mademedoit,

In order to keep the water pump healthy it is important to change your coolant every two years.
Coolant contains additives that deteriorate over time, including those that lubricate the water pump.
If you use concentrate coolant or need to add water while on the road use ONLY distilled water.
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Old 06-12-15, 07:38 PM   #10
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Wow, it is hard to imagine a good mechanic not changing the water pump with the timing belt, unless the owner specifically instructed him not to. Glad you got it when you did!
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Old 06-14-15, 12:12 AM   #11
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It shouldn't be too hard to imagine. The FACTORY repair manual in the instructions for replacement of the timing belt reads as follows;

Check the water pump.

1. Visually check the air hole and water hole for coolant leakage.
If leakage is found, replace the water pump

2. Turn the pulley, and check that the water pump bearing moves smoothly and quietly.
If necessary, replace the water pump.

Remove any oil or water on the crankshaft pulley, oil pump pulley, water pump pulley, idler No.1 and idler No.2, and keep them clean.



I guess if you hit 90K miles and the water pump visually checks out and spins nicely then it should be good until 180K miles, at which time you can check it again?
And no mention of examining the idler pulleys - just clean them!
You just spent $600-$800 (more at a Lexus dealership) in labor and you are not going to spend and additional $120 over and above the belt cost to make sure it lasts?

In the mean time if the water pump or idler pulley or tensioner gives up at 150K miles, breaks the belt and your valves get bent well tough s*** ! $3K or more to your favorite mechanic.

Obviously experience created the Aisin Timing Belt Replacement Kit with all of the important parts to be replaced.

Last edited by SC43052; 06-14-15 at 12:31 AM.
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Old 06-14-15, 02:05 AM   #12
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^Yea it still spun really nice, just as tight as the new one. But all that leaking would have eventually piled up and ruined something in there.

Serpentine tensioner pulley seamed marginal though. Like a skateboard bearing that is getting noisy and losing its tolerance, will probably replace it within the next year or so.
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Old 06-14-15, 02:24 AM   #13
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And um to answer the OP's post, the timing belt is like twice as thick as say a four cylinder honda engine or my old Audi 1.8t engine would have. And working on the car everything seamed to be quite robust and user friendly. But of course if the one of the bearings were to go out it wouldn't matter so much.

That said those bearings also seamed high quality and over sized.Click the image to open in full size.
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Old 06-14-15, 02:24 AM
 
 
 
 
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