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4.7 timing belt

Discussion in '1st Gen Tundras (2000-2006)' started by sidewinder81, Jun 20, 2017.

  1. Aug 1, 2020 at 7:01 PM
    #211
    Festerw

    Festerw New Member

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    I remember someone else having this problem possibly @FirstGenVol
     
  2. Aug 2, 2020 at 6:17 AM
    #212
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

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    Are you saying Toyota replaced the 4” with the 3.5” Pulley?

    I believe there is a TSB on the tensioner causing a squeal in cooler temps and Toyota changed the tensioner and recco’d the new tensioner be replaced along with an A/C Compressor Bracket. Maybe the bracket makes up for the smaller 3.5” Pulley?
     
  3. Aug 2, 2020 at 6:20 AM
    #213
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

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  4. Aug 2, 2020 at 6:42 AM
    #214
    FirstGenVol

    FirstGenVol Allergic to Darkness....

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    Too many
    If he's talking about the serpentine tensioner and not the timing belt tensioner it wasn't me but a buddy's GX470.

    My buddy ended up just replacing the bearing rather than the entire tensioner. I think his dad had one just laying around that worked. I have no idea part number the bearing is unfortunately.

    Edit- he just text me back and said they pressed the old bearing out and went to a shop that sells them and had them find a match. Pressed the new one in.
     
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  5. Aug 4, 2020 at 5:37 PM
    #215
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

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  6. Aug 4, 2020 at 7:28 PM
    #216
    empty_lord

    empty_lord They see me rollin'

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    Yea it was something like that. Never actually done the TSB nor do I know anyone that did. But supposedly the brackets different for the new style tensioner
     
  7. Aug 5, 2020 at 3:31 AM
    #217
    Jamie6279

    Jamie6279 New Member

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    I just had mine replaced about 3 weeks ago right after purchasing it. It had 213k on it and no record if it were ever changed. Belt, H2O pump, main seal, and drive belt done at Camelback Toyota Phx, AZ was $979 out the door.
     
  8. Aug 5, 2020 at 11:42 AM
    #218
    Lil Steve

    Lil Steve Living the dream

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    Welcome from Gilbert!
     
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  9. Aug 5, 2020 at 11:59 AM
    #219
    brobert225

    brobert225 Firm grasp of the obvious

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    I am at 230 and probably overdue slightly for my 3rd belt. I am not too worried about it. Still on original water pump and may change this time. Curious if I can get another 10 yrs out of it. 20 and counting...
     
  10. Aug 17, 2020 at 7:28 AM
    #220
    Yoda123

    Yoda123 New Member

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    New on this forum I have an 03 4.7L. 460kms. Timing belt was done at 320 and it just went/ or something caused it to go. Just wondering. What are the chances that the engine is now pooched?
     
  11. Aug 17, 2020 at 7:50 AM
    #221
    KNABORES

    KNABORES New-ish Member

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    There's an excellent chance that internal damage was done to the pistons and valve train. Did you change the belt yourself or have a shop do it? I would think you would have some recourse against a shop or manufacturer if it failed within a certain amount of mileage or KM. You are well within the recommended change interval of 90k miles or 144kms. A tensioner is the most likely cause if it slipped time. Did the belt break?
     
  12. Aug 17, 2020 at 8:27 AM
    #222
    sixteen2nd

    sixteen2nd New Member

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    2003 means no VVTI right, doesn't that make timing belt failure a bit less catastrophic?
     
  13. Aug 17, 2020 at 9:21 AM
    #223
    Yoda123

    Yoda123 New Member

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    Ya belt broke. Took one of the covers off and I can’t see the belt so it probably piled up somewhere
     
  14. Aug 17, 2020 at 9:33 AM
    #224
    Festerw

    Festerw New Member

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    The few I've read about that broke, if it was at start up or idle you might be lucky and didn't have any damage. If it was driving down the road chances are higher something else is damaged.

    4 options as I see it.
    1. Quick and dirty way would be to grab a cheap borescope from Amazon and pull the plugs to get a look at the pistons/valves with it.
    2. Throw a new timing belt on it and hope for the best.
    3. Pull the heads and inspect.
    4. Pull the engine and put in a lower mileage junkyard or rebuilt.
     
  15. Aug 17, 2020 at 9:49 AM
    #225
    KNABORES

    KNABORES New-ish Member

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    4.7 V-8 is an interference engine. If your timing belt broke, you'd have to be darn lucky not to bend a valve at the very least. Pulling the heads to inspect would be highly recommended. An engine could continue to function with damage to the valves, especially a V-8, plenty of extra cylinders to keep things going. The side effects however would be highly undesirable. Cylinder compression has to go somewhere, right out the non-sealing valve. Chances are the damage would be severe enough to not allow motor function. Broken pieces inside the cylinder, valve bent into the stuck open position causing continued contact with the cylinder etc. As I like to tell the people that work on my team, hope is a terrible strategy.
     
  16. Aug 17, 2020 at 11:41 AM
    #226
    revtune

    revtune New Member

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    Original water pump?

     
  17. Aug 17, 2020 at 12:33 PM
    #227
    FirstGenVol

    FirstGenVol Allergic to Darkness....

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    Too many
    In the few years I've been around here we've actually seen a few members have a belt break and it not do damage. :notsure:
     
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  18. Aug 17, 2020 at 12:42 PM
    #228
    Casper421

    Casper421 Adventure in a 1st gen

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    Same. Here, t4.org and in person. Interference vs non interference is always a fun topic.
     
  19. Aug 17, 2020 at 1:09 PM
    #229
    Yoda123

    Yoda123 New Member

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    Thanks for the input. Looks like she’s now a parts truck.
     
  20. Aug 17, 2020 at 1:13 PM
    #230
    ezdog

    ezdog New Member

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    I feel your pain.
    I lost a VVT 4Runner like this when a newish belt broke and rendered mine a parts truck too.
    Luckily 4Runners are so crazy in demand that I really didn't turn out losing as bad as I thought?
     
  21. Aug 17, 2020 at 2:33 PM
    #231
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

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    And why did your newish belt break?
     
  22. Aug 17, 2020 at 2:53 PM
    #232
    ezdog

    ezdog New Member

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    Some moron installed it badly.
     
  23. Aug 17, 2020 at 2:54 PM
    #233
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

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    Ugh. I hope I don’t mangle mine. :rofl:
     
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  24. Aug 17, 2020 at 2:55 PM
    #234
    ezdog

    ezdog New Member

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    I dont mean me either,some other moron did mine!
     
  25. Aug 17, 2020 at 2:59 PM
    #235
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

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    The water pump stalactites was why I did my TB.

    Speaking of which, Toy offers two water pumps as parts replacement. One made in Japan and the other Made in USA (comes with the gasket). I’ve selected the USA one in my cart when I do the TB.

    upload_2020-8-17_17-58-43.jpg
     
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  26. Aug 18, 2020 at 11:02 AM
    #236
    bmf4069

    bmf4069 Yup, that's car parts in a dishwasher

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    Need help? :wave:
     
  27. Jan 10, 2021 at 2:42 PM
    #237
    coveredinlube

    coveredinlube New Member

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    Recently traded the parents for a 2003 sequoia. 188k miles and still on the stock timing belt. Probably going to change it next week
     
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  28. Jan 10, 2021 at 2:50 PM
    #238
    N84434

    N84434 In the Frozen Tundra

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    Welcome to the club!
     
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