Results 1 to 9 of 9

Thread: Upper AC/Alt Idler pulley used as Lower AC/Alt Tensioner Pulley

  1. #1
    Member verified Feedback Score 2 (100%) blindmist's Avatar
    Join Date
    Sep 2010
    Owner Since
    Aug 15, 2005

    Location
    Texas
    Posts
    698
    Thanks
    15
    Thanked 45 Times in 28 Posts

    Upper AC/Alt Idler pulley used as Lower AC/Alt Tensioner Pulley

    So I have had an issue with the bearings on one of my pulleys. I figured I would go ahead and replace the upper idler pulley because it was the cheapest of the two. 60 for the upper and 150 for the lower. Well it turns put the upper was just fine, and its the lower tensioner pulley making all the noise.

    I decided I was going to use my old upper as my new lower.

    I examened the lower and noticed on the back side, it has a lip to keep the pulley pulled off the tensioner bracket. I found a washer that was the same thickness of that lip and threw it behind the old/new replacement and that solved the issue of running into the tensioner bracket. The upper pulley is a little bit larger in diameter, but the belt length isn't changing so that doesn't matter. Luckily enough on our cars, mits gave us plenty of tightening and loosening adjustment on this pulley.

    I must say, if you ever need to replace the lower pulley, save yourself the money and just buy the upper and add a washer or two to match the lip that keeps the pulley off the tensioning bracket. Much cheaper solution.

  2. The Following 2 Users Say Thank You to blindmist For This Useful Post:


  3. #2
    Forum User Not Verified Feedback Score 4 (100%) TUFFTR's Avatar
    Join Date
    Sep 2010
    Owner Since

    Posts
    756
    Thanks
    27
    Thanked 13 Times in 9 Posts
    Suggestion is good! Actually did this today, I have a spare DOHC so I just took my chance and replaced both, voila, horrible noise under load gone!!

    I am positive the SOHC 3.0 and 3.5L Diamante's have the same pulley's I will find out later on in the week. I am going to get a few spare if they are!

  4. #3
    Born To Build Feedback Score 0 Bluejediz's Avatar
    Join Date
    Sep 2010
    Owner Since
    June 2009

    Location
    Central, MN
    Posts
    78
    Thanks
    1
    Thanked 3 Times in 2 Posts
    Quote Originally Posted by TUFFTR View Post
    Suggestion is good! Actually did this today, I have a spare DOHC so I just took my chance and replaced both, voila, horrible noise under load gone!!

    I am positive the SOHC 3.0 and 3.5L Diamante's have the same pulley's I will find out later on in the week. I am going to get a few spare if they are!
    What kind of noise did it make? Mine makes a "shchhk shchhk" type noise lol only when flooring it or in a high gear at low speeds.

  5. #4
    Member verified
    supporter
    Feedback Score 0 DocWalt's Avatar
    Join Date
    Sep 2010
    Owner Since
    Oct '08 - Oct '10

    Location
    Royersford, PA
    Posts
    3,491
    Blog Entries
    1
    Thanks
    784
    Thanked 391 Times in 274 Posts
    I'm pretty sure mine made noise (a rattle while revving, and at a certain RPM). I never got around to replacing them. Great tip!
    R135
    ╚╬╬╝
    - 24

  6. #5
    94 3500gt vr2? verified Feedback Score 9 (100%) n2nsanity's Avatar
    Join Date
    Sep 2010
    Owner Since
    2007

    Location
    NC
    Posts
    1,076
    Blog Entries
    4
    Thanks
    103
    Thanked 29 Times in 17 Posts
    great idea, i'll have to keep that trick in mind. had to replace my lower a while back, but luckily i had a spare. i have a dohc 6g72 and 6g74 sitting out. i'll compare them later
    is the lower pulley more expensive because it comes with the tensioner? or is it really 150 just for the pulley? that's way too much for a pulley.

  7. #6
    Member verified Feedback Score 2 (100%) blindmist's Avatar
    Join Date
    Sep 2010
    Owner Since
    Aug 15, 2005

    Location
    Texas
    Posts
    698
    Thanks
    15
    Thanked 45 Times in 28 Posts
    It is the pulley and new bolts, aka tensioner bolt/lug and mounting/locking bolt. Austin@STM quoted me $130 @ 10-11-2010 for the lower for the guys that still want the correct/stock setup.

    The pulley would make a terribly loud whine. I mean you could hear the pulley over the exhaust, even under boost. I have straight pipe turbo back, gutted cats, and no muffler. If you were to spin the pulley in your hand, and hear the faint (on a good one) noise of the resonance of metal itself, amplify it by 100x. It would also have the bearing locking up for fractions of a second, sounding similar to an AC clutch, but worse. It would also have belt chirp. It would change about every 15 minutes, except for the whine, that was ALWAYS there. This is the 2nd set of pulleys I have had, well now third, the first two had the identical whine, but I know it isn't from over tightening. I am very picky about my belt tension being perfect.

  8. #7
    94 3500gt vr2? verified Feedback Score 9 (100%) n2nsanity's Avatar
    Join Date
    Sep 2010
    Owner Since
    2007

    Location
    NC
    Posts
    1,076
    Blog Entries
    4
    Thanks
    103
    Thanked 29 Times in 17 Posts
    wonder why its so much
    cherry hill mits its even 140
    Last edited by n2nsanity; 10-12-2010 at 04:31 PM. Reason: cherry hill mits instead of rockauto

  9. #8
    Forum User verified
    Feedback Score 13 (100%) Austin@STM's Avatar
    Join Date
    Sep 2010
    Owner Since

    Posts
    1,249
    Thanks
    4
    Thanked 74 Times in 57 Posts
    because mitsu can charge whatever they want for it even though all pulleys are pretty much the same, if they say its 3 times more than it is.

    -Ricer Evo 8: 8.75 @ 166 Best MPH of 167. Quickest 4G63 Powered Evo in The US!!!
    -Chris Cessna's Stock short block Evo 8: 9.76@150 Worlds Fastest Stock Motor Evo 8 and First Stock Block In The 9's!
    -Shawna's DD Evo 8: 9.97@143.88 Best MPH of 145 Full leather interior, A/C, navigation, stock brakes, cruisin 9's in style
    -Cory's Stock 7 bolt talon: 10.3@136 No crank walk here...
    -STM Stock turbo/motor Stealth RT: 10.95@127 Worlds Quyickest/Fastest and most powerful Stock turbo/ motor 3S
    -James STM built Pump gas Evo8 stock motor: 10.2@137 Stock long block, and only on pump gas!
    -Mike Faggiano Evo3 16g stock motor 1g 11.0@124 just a 16g knockin on 10's door.
    And the list goes on...

  10. #9
    Member verified Feedback Score 2 (100%) blindmist's Avatar
    Join Date
    Sep 2010
    Owner Since
    Aug 15, 2005

    Location
    Texas
    Posts
    698
    Thanks
    15
    Thanked 45 Times in 28 Posts
    Quote Originally Posted by Austin@STM View Post
    because mitsu can charge whatever they want for it even though all pulleys are pretty much the same, if they say its 3 times more than it is.
    And this is when it takes ingenuity to save money!!! That and some common sense so you don't do something stupid or unsafe.

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
3000GT / Stealth / GTO Resources
3000GT / Stealth / GTO / Multi-site Classifieds
3000GT/Stealth/GTO Event Pages
3S National Gathering
East Coast Gathering
Upper Mid-West Gathering
Blue Ridge Gathering
3000GT/Stealth/GTO Clubs and Groups
Michigan 3S
MInnesota 3S
Wisconsin 3S
Iowa, Nebraska, Kansas 3S
North California 3000GT/Stealth
United Society of 3S Owners
3000GT/Stealth/GTO Forums
3000GT/Stealth International
3000GT/Stealth/GTO Information and Resources
Team 3S
3000GT / Stealth / GTO Information
daveblack.net
The 3000GT/Stealth/GTO Web History Project
3000gt.com
3000GT / Stealth International WWWboard Archive