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Thread: Serpentine Belt

  1. #1
    Join Date
    Apr 2001
    Location
    Alvin, TX, USA
    Posts
    192

    Default Serpentine Belt

    Have a 2005 GMC 2500HD LLY/Allison. Stopped at O'Reilly Autoparts to buy a new serpentine belt. Apparently to identify appropriate belt, one must know what size alternator (105 vs 145 amp) and whether there is a vacuum pump. I'll plead ignorance and ask you guys for advice.

  2. #2
    Join Date
    Apr 2001
    Location
    Alvin, TX, USA
    Posts
    192

    Default

    More specifically, does an LLY Duramax have a vacuum pump and how do I tell which alternator I have?

  3. #3
    Join Date
    Mar 2000
    Location
    Loyal WI US
    Posts
    10,792

    Default

    You'll have to look at the belt diagram under hood and see which one it is.

    We don't stock the w/VP modles, but stock the std and a much better price than most for a super tough belt.
    Kennedy Diesel-owner
    More than just a salesman-I use and test the products that I sell on a daily basis!
    Superflow Lie Detector in house
    2002 Chev K2500HD D/A CC Long LT 11.77@ 124mph at 7700# fuel only-e.t. needs help
    2005 Chev K3500SRW D/A CC Long LT(SOLD)
    2007 Chev K2500 Classic EC Short LT (Sold)
    2012 GMC K3500SRW D/A CC Long LTZ Happy Birthday to me! Built 1 working day after my birthday and delivered 7 days later.
    2016 GMC K3500SRW D/A CC short LTZ

    Custom tuning in house using EFI Live tuning software!

  4. #4
    Join Date
    Feb 2000
    Location
    Maplesville, AL - Home Base
    Posts
    536

    Default

    Mine is further complicated because mine has two alternators.
    Ed
    KM4STL

    '06 Sierra LBZ 4x4 Crew SB, Titan 52 gallon fuel tank, TTT/Schefenacker Mirrors
    '98 Suburban, 245,000 - sold 7-4-06

  5. #5
    Join Date
    Apr 2001
    Location
    Alvin, TX, USA
    Posts
    192

    Default

    Label under hood is weathered some but all I see there is a routing diagram, no other labeling other than gas or diesel engine. Is there other info there somewhere? Looked at my original window sticker and it showed no options for an alternator so was stock alternator 105 amp? Which trucks came with vacuum pumps (CA versions) ? Mine was purchased in Louisianna.

  6. #6
    Join Date
    Mar 2000
    Location
    Loyal WI US
    Posts
    10,792

    Default

    Actually I had a brain fart here. The LB7 to my knowledge is the only one to ever have a vacuum pump so you should be OK with the std belt.
    Kennedy Diesel-owner
    More than just a salesman-I use and test the products that I sell on a daily basis!
    Superflow Lie Detector in house
    2002 Chev K2500HD D/A CC Long LT 11.77@ 124mph at 7700# fuel only-e.t. needs help
    2005 Chev K3500SRW D/A CC Long LT(SOLD)
    2007 Chev K2500 Classic EC Short LT (Sold)
    2012 GMC K3500SRW D/A CC Long LTZ Happy Birthday to me! Built 1 working day after my birthday and delivered 7 days later.
    2016 GMC K3500SRW D/A CC short LTZ

    Custom tuning in house using EFI Live tuning software!

  7. #7

    Default

    Quote Originally Posted by EdHale View Post
    Mine is further complicated because mine has two alternators.
    If you have dual alternators (like I do) you should order a spare and keep it in the truck.
    2011 Chevrolet Tahoe 5.3L daily driver
    • Previous owner of two 1994 6.5L K3500s, '01, '02, and '05 6.6L K2500s, '04 C4500, '06 K3500 dually, '06 K3500 SRW, '09 K3500HD SRW, '05 Denali
    • Total GM diesel miles to date : ~950K

  8. #8
    Join Date
    Feb 2000
    Location
    Maplesville, AL - Home Base
    Posts
    536

    Default

    You are correct Mark. I should have carried a spare all this time, but....

    A few weeks ago I did replace both idlers, tensioner and the belt just because of 100,000 miles. The old belt is wrapped up and stored securely under my back seat.
    Ed
    KM4STL

    '06 Sierra LBZ 4x4 Crew SB, Titan 52 gallon fuel tank, TTT/Schefenacker Mirrors
    '98 Suburban, 245,000 - sold 7-4-06

  9. #9
    Join Date
    Dec 2004
    Location
    Texas
    Posts
    683

    Default

    You guys that replace idlers and belts just because it hit 100,000. Where's your faith in GM?I haven't replaced any of that and I'm coming up on 200,000 miles. Been carrying the spare belt in the tool box now for over a year, maybe someday...

    Little hint, take your cell phone and take a picure of your belt routing before it breaks and keep the picture in your phone. Oh and it don't hurt to photograph the belt part number that is on the belt you now have you know. So when you walk up to that parts counter looking for a new belt, the info will be right there with you.
    02 2500HD LT D/A SB CC 4X4 BLACK, Westin stainless nerf bars, BW GN Hitch,Racor 60S post oem fuel filter, Oil Guard bypass engine oil Filter. All synthetic fluids. Kennedy boost valve, edge, Modified air intake,EGT & Boost digital gauge,TransferFlow combo fuel & tool box, Air Lift Suspesion Bags Rear & compressor with remote, Bilsteins front & rear, Frontier front replacement bumper.

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