Serpentine Belt
Driver
Joined: Feb 2005
Posts: 114
Likes: 8
From: NJ
Correct, your car has a timing chain. They usually dont need to be replaced. The serpentine belt Is the rubber belt that you see around the pulleys that drives the accessories, etc. That belt I usually change when its starts to feel little less flexible and or you start to see it fraying.
Driver
Joined: Feb 2005
Posts: 114
Likes: 8
From: NJ
As mentioned I usually just inspect the belt at each oil change. How many miles are on your car? It cant hurt to change it if it's been 50,000 miles or something along those lines for piece of mind but I've honestly gone 100,000 miles on the same belt in tbe past.
Racer
Joined: Jul 2004
Posts: 1,549
Likes: 217
From: Massachusetts
If you have belt squealing at start up then your belt may be worn, but I have found a weak belt tensioner may be the issue. The original one will weaken after 7 years. I changed out 2 belts myself to get rid of the noise but the tensioner was the culprit all along.
Advanced
Joined: Apr 2014
Posts: 667
Likes: 80
From: New Jersey
Very TRUE! I usually change my tensioner and any associated pulleys when I change my belt on all of my cars... Doesn’t cost too much more and it eliminates a future problem. Keep in mind these tensioners lose spring tension over time and the pulleys have bearings so they get a "work out" every time you run your engine.
Last edited by Chuckinnj; Apr 28, 2019 at 11:05 AM.
Driver School Candidate
Joined: Aug 2019
Posts: 1
Likes: 0
From: ca
How to tighten belt 2007 es350
I would like to know if it was possible to tighten the The serpentine belt took it off to get to the thermostat and I’ll try to put it back on and it’s really loose looking for a way to tightenIf possible
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Lexus Champion
Joined: Sep 2010
Posts: 2,218
Likes: 300
From: NA
The 1UR-series engine uses a serpentine accessory belt and a timing chain instead of a timing belt.
The earlier 1UZ-FE used both a serpentine accessory belt and a timing belt.
The timing belt used in the 1UZ-FE was an excellent HSN design that in my opinion is way better than a timing chain. I can easily change that timing belt, but the timing chain is noisy and hard to replace at high miles.
quick edit: serpentine belt ALWAYS refers to accessory drive. Accessory meaning things like A/C, PS, alternator, etc. They don't use the word serpentine belt to refer to camshaft timing and phasing. And serpentine belt is used for a certain type of belt used to that end - because before your time, they used a bunch of individual accessory belts to do what a serpentine belt does now. Look at the crank pulley of an old motor like the 7M-GE. It has a lot of notches for a lot of belts. Modern engines use a single set of notches to use only one belt to run a whole shxxton of accessories at once. That's technology for ya
Last edited by sdls; Aug 13, 2019 at 06:34 PM.
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