Timing Belt Question

[470SNC]

I changed mine out at 100k, no issues

 

[1950884]

No, just around 150~200k, you'll want to start having the chain tension checked; eventually it will become looser; which requires replacement of the chain, sprockets, ect. That is of course assuming the timing cover hasn't sprung a leak by then, which would be a good time to have the chains checked since it's a labor intensive job (or hell just replaced if it's already hitting into the 200k range since you'll have the front of the motor apart.)

It all works out in the long run, you save money in the early years of a chain motor because it doesn't need regular service; but when it does finally start wearing out you're basically replacing the front half of the motor. Then again, hopefully the chain just won't break and destroy the timing cover (very expensive part) and lock up the engine anyways (these days with such squishes combustion chambers, high compression, and valve/piston reliefs there really isn't a true "non-interference" motor out there anymore; they're just less likely to grenade than others when timing is severely out of whack.) In the end if you're keeping the V6 into the 300k range, it almost evens out with the slightly cheaper 3 timing belts & water pumps at 300k.

...

I have a data point to share about timing chain on my 1GRFE. I was forced to have the head gasket replaced at 135,000 miles. The Toyota tech checked the tensioner and all was well.

 

[ChaosStarter]

Honda has had issues with water pumps seizing and ripping the timing belt apart because they use a gear tooth water pump pulley that meshes with the timing belt. Toyota typically (at least on their "newer" timing belt engines like the 2UZ-FE) just uses the smooth backside of the belt to run the water pump. So when it seizes it will more than likely burn up before it breaks (which takes a while and the customer will complain of noise.)

In all honesty I have never seen a timing belt break on a 2UZ-FE, one 5VZ-FE and a couple of the 1MZ-FEs and 3MZ-FEs though.

I've seen one and it ****ED up that motor. It was an 06 4R. The reason is however, the water pump was basically pissing out and ruined the belt. It smashed valves at 75mph. The funny thing is that we warned her a couple times prior that her water pump was leaking. Next thing yas know, $3500 junkyard motor before labor.

 

[rancho66]

Just had Timing Belt, Water Pump, Thermostat, Tensioner, and pulleys replaced at 200,222 miles. All were originals. Belt had cracks. Bought this truck at 197,000 last year with seller saying he had it done. Even gave me a phony receipt. Now that is some long lasting rubber!
Sorry for bringing back an older thread

 

[Lineman]

You have 13 years on your original belt.

The manual is every 72 months OR 90K miles.

If/when it goes and engine is destroyed. There is no one to blame but you.

I've got 85,000 miles on the 2003. Waiting until 90-100K before doing this repair.

 

[07V8]

You have 13 years on your original belt.

The manual is every 72 months OR 90K miles.

If/when it goes and engine is destroyed. There is no one to blame but you.

Relax. They last way longer than the book says.

 

[BlackWorksInc]

Relax. They last way longer than the book says.

It's not about how long you can push it until... I wouldn't run one past about 90~110k and 9yrs myself. The problem is that you can't tell when a timing belt is "bad", the polymer they are made from does not crack or show significant wear like a serpentine belt. A lot of the belts we've pulled off engines that are anywhere from 1~12+years old and 30~100k+ miles look almost entirely the same. These belts tend to just give out without much visual warning; you can push it some, but I wouldn't risk the engine over getting it done.

 

[Bob22222]

03 and 04 V8 are non-interference engines, correct?

 

[BlackWorksInc]

03 and 04 V8 are non-interference engines, correct?

All 2UZ-FE are interference, '03~'04 are non-VVTi

 

[rancho66]

Here are a couple of pictures of my 200,000 mile timing belt. Cracks on the belt were all the way around and I could barely read one line of the Toyota part number. The pulley and water pump bearings were still smooth though. I am glad I did not trust the seller and his phony receipt.

 

[BlackWorksInc]

Here are a couple of pictures of my 200,000 mile timing belt. Cracks on the belt were all the way around and I could barely read one line of the Toyota part number. The pulley and water pump bearings were still smooth though. I am glad I did not trust the seller and his phony receipt.

Yeah that's probably 200k miles for sure, I don't think I've seen one that old before; I guess the extra 100k gets them that really worn out look. Most of the ones around 100k tend to not look nearly as bad.