Idler pulley replacement.

[Brownfaux]

I used the Napa pulleys since they are sealed and I’ve heard they hold up better in water.


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[L8Shift]

The V8 uses:
1 idler pulley: Dayco 89154; Toyota 16604-50030
1 Tensioner/pulley: Dayco 89255; Toyota 16620-0W101 (reverse thread pulley bolt :keyboard: )

 

[Hellomoto]

belt tensioner pulley

Anyone know the part number for the tensioner pulley only? I can find the whole tensioner unit, but I only need the pulley. 4.0 V6

 

[BackOff]

I will inject this here...
http://www.toyota-4runner.org/4th-gen-t4rs/260528-not-bad-alternator.html

 

[earthrealm]

Just replaced the Tensioner ASSEMBLY Friday. I replaced the idler pulley about 15,000miles ago. Just do the whole assembly. I was having a really gnarly chatter and belt chirp, and finally tracked it down to the assembly that wasn't exerting tension smoothly.
One tip: if, when you use your ratchet or bar to release tension on the serpentine belt, the assembly creaks AT ALL, or isn't totally smooth, replace the whole shebang.

I did it in 4 hours, including setting up an ice bucket with a fan (garage was 105 degrees) as a swamp cooler, working on my computer for some torque specs, talking with the girlfriend when she called (too often), etc. it's not fun but man is the engine better now. it even idles smoother.

Thanks for the detailed write up.
My truck developed a loud chatter recently, which goes away when warm, which am sure is from the idler pulleys or tensioner.

Any danger of the belt grenading if the issue isnt tackled asap?..
From this post, i see its only the tensioner that is reverse thread.please confirm this.

How easy was it to break the bolt holding the idler rollers. You know the factory torque specs?
Am short of time and have a 250mile trip lined up

 

[AuSeeker]

Thanks for the detailed write up.
My truck developed a loud chatter recently, which goes away when warm, which am sure is from the idler pulleys or tensioner.

Any danger of the belt grenading if the issue isnt tackled asap?..
From this post, i see its only the tensioner that is reverse thread.please confirm this.

How easy was it to break the bolt holding the idler rollers. You know the factory torque specs?
Am short of time and have a 250mile trip lined up

I have the V8 and it was my tensioner bearing that went out on me, it was a bit noisy but didn't brother me too much...until when leaving for work one morning it completely froze up and the belt slipping on the pulley was deafening, I had to take off work to fix it that day, the belt was toast but didn't break by the time I went to a parts store a total of about 15 miles and back home to fix it.

 

[Jssrvlz]

Hi guys. When I check on amazon. This part I need 2 of is saying this doesnt not fit the 04 4runner v6. Is this just an error on Amazon? I will order them if you guys say it is in fact the correct part. Thanks
I think I attached the photo correctly

 

[AuSeeker]

Hi guys. When I check on amazon. This part I need 2 of is saying this doesnt not fit the 04 4runner v6. Is this just an error on Amazon? I will order them if you guys say it is in fact the correct part. Thanks
I think I attached the photo correctly

I can't say for the V6 if that's the correct pulley or not, I don't have the V6 engine, BUT I would highly suggest you get a tape measure and try and get a measurement of the pulleys on your engine, the reason I say this is because I have the V8 and for the 2004 year model the V8 came with different size pulleys depending on when it was manufactured, later 2004 V8s had a smaller pulley than the earlier 2004 V8s.

 

[jbtvt]

Hi guys. When I check on amazon. This part I need 2 of is saying this doesnt not fit the 04 4runner v6. Is this just an error on Amazon? I will order them if you guys say it is in fact the correct part. Thanks
I think I attached the photo correctly

Check Rockauto to confirm your part #s. Usually a little cheaper than Amazon too after the 5% discount code found everywhere. FYI, you might save a few bucks with Dayco but odds are that it won't last you even half as long as a Gates. All the gates pullies and tensioners I've seen were made in Canada by OEM maker Litens and used the OEM NTN bearings. Even the older US made Daycos I've seen used cheap Chinese bearings

 

[huey chief]

Thanks for the info on this old thread.

 

[Jssrvlz]

Thanks guys.

I ended up buying the whole set from RockAuto. I went with Gates. After talking to advanced, they are pretty clueless on which pulley may be for which pulley. So I gave up on them and at $60 per pulley, forget that.

All 4 pulleys with the tensioner and a new belt at 180 something. Itll do the ol girl some good

 

[IRONLUNG]

Reading in another thread here that its usually the bearings that fail; the factory bearings in these pulleys/tensioner are not sealed if I recall correctly. You can replace just the bearings and should be gtg......

 

[missionman]

Does anyone know what position the Under Idler No. 2 pully (upper) is supposed to be in? I replaced my alternator and when i installed the Idler No 2 back on when you tighten the bolt the thing moves 360' in every direction.
Am i supposed to push the pully down on the belt or just let it rest against the belt? I just tightened the bolt and let it sit in whatever position it wanted to. Should the belt be turning the Idler pully or just skim across it?
Thanks for the help!

UPDATE: It looks like im missing the little center insert thingy that the bolt goes through. Am I wrong? My Idler pully next to the alternator has no center piece. Is that why the wheel is moving 360' degrees in all directions? Looks like I answered my own question which is depressing. now I gotta wonder if any other pullys have missing hardware.

 

[Syr4RinNC]

Does anyone know what position the Under Idler No. 2 pully is supposed to be in? I replaced my alternator and when i installed the Idler No 2 back on when you tighten the bolt the thing moves 360' in every direction.
Am i supposed to push the pully down on the belt or just let it rest against the belt? I just tightened the bolt and let it sit in whatever position it wanted to. Should the belt be turning the Idler pully or just skim across it?
Thanks for the help!

UPDATE: It looks like im missing the little center insert thingy that the bolt goes through. Am I wrong? Mine Idler pully next to the alternator has no center piece. Is that why the wheel is moving 360' degrees in all directions? Looks like I answered my own question which is depressing. now I gotta wonder if any other pullys have missing hardware.

Im not quite sure. The belt diagram is under the hood.

This video does a pretty good explanation of the pulleys and belt path. Go to 10:50 and watch. Hopefully thatll answer your questions
https://www.youtube.com/watch?v=-5Jeyw1cyS4

 

[missionman]

Im not quite sure. The belt diagram is under the hood.

This video does a pretty good explanation of the pulleys and belt path. Go to 10:50 and watch. Hopefully thatll answer your questions
https://www.youtube.com/watch?v=-5Jeyw1cyS4

Yea, I found out the center piece that keeps the upper idler pully no2 in place is missing. I just ordered a acdelco upper idler pully.

 

[hungryfobz]

Good info, seems like Dayco is OEM pulley supplier for Toyota.