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[DIY] Replacing driving/serpentine/timing belt (and idler pulleys)

Discussion in '2.5 Gen Tundras (2014-2021)' started by Spvrtan, Apr 9, 2017.

  1. Nov 19, 2019 at 7:01 PM
    #31
    Seq4x4nate

    Seq4x4nate New Member

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    Replaced idler pulley and tensioner. New tension pulley isnt rotating. Tried loosening bolt and tightening till the spring started to flex and still nothing. Also just replaced serpentine belt as well. Any tips please? Should i have gotten the whole tension pulley assembly? Oh yeah 02 Sequoia 4x4
     
  2. Nov 20, 2019 at 5:31 AM
    #32
    Crunch527

    Crunch527 Brute Force and Ignorance

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    Recommend you start a new thread. Not sure about an 02 Sequoia? I realize the Tundra and Sequoia share drivetrains but might have better luck on a sequoia forum?

    For what it is worth, I’d replace the whole tensioner assembly. It’s only a few bolts...besides, once you have the splash guard off and the belt off you are there.
     
  3. Nov 23, 2019 at 2:10 PM
    #33
    Boosted4runner

    Boosted4runner Join the NRA please.

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    2015 Tundra 5.7

    I didn’t see any mention of a 6mm allen ratchet needed. Is it required to remove the tensioner? I pulled the 12mm tensioner bolt just now, and tried to use a normal “L” 6mm Allen to loosen up the center bolt, and it’s not budging.

    Also, the idler pulley is designed differently. Anyone have any issues with the Dayco Kit? :confused:
    @Dilsky

    598FF5F9-D3E1-4F1E-BEAF-105CEF43D44F.jpg
    CE77E412-F86E-43E9-80B4-008C1A328A66.jpg
    777EB452-A454-4D63-A640-E098131E2A4D.jpg
     
    Last edited: Nov 23, 2019
  4. Nov 23, 2019 at 2:52 PM
    #34
    Boosted4runner

    Boosted4runner Join the NRA please.

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    Yep, 6mm socket Allen required for future folks. Of course I lost my entire damn stick of them! G damnit. It’s always something :D
    Thankfully I had one of the cheap screwdriver kits with a ratchet to screwdriver adapter.

    798BEEEE-D843-483B-9931-D6E04EF34770.jpg
     
  5. Nov 23, 2019 at 5:02 PM
    #35
    Spoolnms

    Spoolnms New Member

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    Nice write up
     
  6. Nov 26, 2019 at 12:42 PM
    #36
    parker44

    parker44 New Member

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    Sub'd....looking to replace mine in the coming weeks.
     
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  7. Nov 26, 2019 at 1:22 PM
    #37
    Spvrtan

    Spvrtan [OP] Amateur fabricator

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    I've been using only Dayco parts without any issues. I just swapped in new supercharger and #1 idler pulleys today from Dayco (same part numbers in the first post) and a new serpentine belt from Toyota.
     
  8. Nov 26, 2019 at 2:50 PM
    #38
    Boosted4runner

    Boosted4runner Join the NRA please.

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    I installed the entire kit with tensioner pulley and idler pulley, along with new belt. All seems well. :thumbsup:
     
  9. Nov 29, 2019 at 10:57 AM
    #39
    Ctmangrum

    Ctmangrum New Member

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    Which direction to loosen the tensioner from underneath the truck looking up?
     
  10. Dec 28, 2019 at 9:17 AM
    #40
    vhstejskal

    vhstejskal New Member

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    I know a little late to reply but if you're looking up from under the truck it's toward the drivers side of the vehicle.
     
  11. Dec 28, 2019 at 9:18 AM
    #41
    vhstejskal

    vhstejskal New Member

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    Also, great write up for sure. Just replaced mine using the Dayco kit and everything went off without a hitch (well almost). Just be sure to follow the belt path outlined in the earlier post; don't ask me why. :anonymous:
     
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  12. Mar 19, 2020 at 10:52 AM
    #42
    Albinator

    Albinator Jehovah-Nissi

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    This is great, thank you!

    Just to make sure I understand (because I’m replacing my belt, tensioner idler and idler like you show in your pictures) what size tools do I need? I have the 5.7 but it’s not the supercharge.

    75E19E15-33AF-403D-856F-E5C0C1A198F7.jpg
     
  13. Mar 20, 2020 at 7:38 PM
    #43
    Neutron

    Neutron Parrothead

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    14, 12 mm socket, ratchet, 6mm Allen socket. And to make things easy use a hand held 4mm allen wrench to put in the tensioner to keep hold it in place when you release the tensioner
     
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  14. Mar 20, 2020 at 8:18 PM
    #44
    Vince

    Vince New Member

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    I just bought that same kit no issues yet.
     
  15. Mar 20, 2020 at 8:43 PM
    #45
    SouthWestGA

    SouthWestGA New Member

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    I used a piece of small pipe over the end of my 6mm “L” Allen wrench to bust it loose

    After that,I used my 1/4in 6mm socket and got it the rest of the way out

    The first one I did,it made a crack sound when it broke loose but don’t worry!!
     
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  16. Mar 21, 2020 at 6:41 AM
    #46
    Albinator

    Albinator Jehovah-Nissi

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    ACF8F8D1-8ADF-4437-869A-64D09C047335.jpg
     
  17. Mar 21, 2020 at 6:59 AM
    #47
    chugs

    chugs New Member

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    U can use whatever you want as long as it fits the hole and holds back the tensioner so you can remove the belt as well as when you reinstall belt. I used a nail.
     
  18. Mar 21, 2020 at 11:08 AM
    #48
    SouthWestGA

    SouthWestGA New Member

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    My post was referring to the center 6mm bolt being tight and needing extra force to break loose

    As far as holding the tensioner back,basically anything that fits in there will work.
     
  19. Mar 21, 2020 at 7:14 PM
    #49
    Albinator

    Albinator Jehovah-Nissi

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    Thanks everyone! The job is done and took longer than I anticipated. But it all seems to be running smoothly (I always wonder if I did it right when I do a car job...).
     
  20. Jun 1, 2020 at 3:06 PM
    #50
    kevine0001

    kevine0001 New Member

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    Thanks for all the info. Did my belt the other day. About a half hour. I got the Gates kit, but didn't have time to do pulleys. My truck is still under CPO extended warranty, but they found that my pulleys were fine, just a glazed belt, which was not covered. So just did the belt. But now i'll keep the two pulleys as spares for when they eventually go. Rock auto had the kit at my front door in less than 48 hours.
     
  21. Nov 10, 2020 at 12:54 PM
    #51
    mccoconnor14

    mccoconnor14 New Member

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    Advice would be appreciated.
    I'm trying to remove my tensioner and idler pulley. No problem letting off the tension and removing the belt. Easy. Now I'm trying to remove the 6 mm Allen head bolt in the tensioner. I can't get a 6 mm socket in it. Might be too must rust? Not sure but it's soaking in PB Blaster right now. I think I have one chance to get this out and if I don't, then a small project gets really big. Any thoughts or advice would be appreciated. All the nice photos you've posted are helpful but I noticed none of them have as must rust as my 2010 Tundra. Maybe I just replace the pulley?
    Thanks.
    Thanks everyone.IMG_0690.HEIC.jpgIMG_0690.HEIC.jpg
     
  22. Nov 10, 2020 at 1:34 PM
    #52
    Sumo91

    Sumo91 Busy with projects

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    Get a small flathead and scrape away as much rust as you can at the bottom of the hole so your Allen head gets as deep a fit as possible, I'd leave the rust on the sides and tap the Allen head into the hole to get as snug of a fit as possible. If you scrape away the sides your Allen head may fit loosely and strip out. Wouldn't be a bad idea to order a new tensioner bolt for reinstallation
     
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  23. Nov 10, 2020 at 1:40 PM
    #53
    SouthWestGA

    SouthWestGA New Member

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    I used a stand-alone Metal Allen wrench for mine

    i stuck the short end in the socket,and placed a jack handle over the long end and broke it loose

    Brake parts cleaner and a little sandpaper will probably make the bolt clean up

    Heck,stick a straw on a brake parts can and see if it cleans the socket cap out
     
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  24. Nov 11, 2020 at 7:46 AM
    #54
    Charliebrn

    Charliebrn New Member

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    It’d be cool to know at what mileages you are all starting to hear the chirping that indicates new idlers are needed...

    otherwise, what a great post! Thanks!
     
  25. Nov 11, 2020 at 9:21 AM
    #55
    mccoconnor14

    mccoconnor14 New Member

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    Update. I cleaned up the Allen head bolt as best as I could with PB Blaster and a small pick. Good enough to get the Allen head socket started. Then tapped it in with a small hammer to seat it as deep as possible. Put the breaker bar on it, said a prayer, and began to put the pressure on slowly. With nearly full pressure on, I heard a loud "pink". Something gave way! Like I broke the Allen head socket or the bolt. Thankfully, I got lucky and the bolt broke loose. Very slowly, I back that thing out and told myself to never underestimate the power of prayer. With my revised religious beliefs, I replaced the tensioner and idler pulley and put it all back together in less than 10 min. Started her up and she sounds more quiet than ever. No annoying chirping.

    I would recommend doing this work from underneath the truck, rather than from above as I've seen in YouTube videos. No room from above but pretty easy from under.

    2010 Tundra SR5 TRD with 212,000+ hard miles

    Thanks everyone.
     
  26. Jan 10, 2021 at 3:29 PM
    #56
    Harold_Z

    Harold_Z New Member

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    I had the same situation, and I did not have enough time to get it off, so I only replaced the idler pulley. Everything was going well until I was trying to take this off. I tried WD-40 and also a heat gun, but it did not work at all. I will leave my old one in there for now and find a better way after, definitely gonna replace the 6mm bolt as well.upload_2021-1-10_17-28-3.jpg

    upload_2021-1-10_17-28-29.jpg
     
  27. Jan 26, 2021 at 11:41 AM
    #57
    DVYota

    DVYota Super stock street truck

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    Used this write up to fix my 2014 sequoia. Super helpful. Local auto part stores had Duralast pulleys that said they fit but they are shaped wrong. Went with Toyota parts.
     
  28. Jan 31, 2021 at 8:16 AM
    #58
    Adam

    Adam New Member

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    I am at a loss here. Replaced belt, pulley and tensioner. Whenever I start it up, the belt at the alternator jumps a groove. I reset everything and it does it again. Wtf?
     
  29. Jan 31, 2021 at 9:13 AM
    #59
    Adam

    Adam New Member

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    I think I got a defective tensioner. Put the old one back on and everything is good now. Will need to replace at some point as the bearings were not sounding the best.
     
  30. Apr 22, 2021 at 11:07 PM
    #60
    Jackfrost

    Jackfrost New Member

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    This is my next project. Thanks for the write up.
     

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