wagler mechanical belt tensioner

byeezy_lb7

Member
Feb 19, 2020
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Reno, NV
Wondering if anyone knows why the Wagler mechanical belt tensioner won't work for an LB7 but an oem one will for for 02-10 model year duramax engines..?

Anyone know if there's any other companies making one? tired of belts getting shredded.
 

KyleC4

Tech
Dec 30, 2016
334
6
18
Bay Area
Wondering if anyone knows why the Wagler mechanical belt tensioner won't work for an LB7 but an oem one will for for 02-10 model year duramax engines..?

Anyone know if there's any other companies making one? tired of belts getting shredded.
I actually talked to Wagler last week about a belt problem and they told me they are currently in the process of having a tensioner finished for the lb7’s soon
 

Chevy1925

don't know sh!t about IFS
Staff member
Oct 21, 2009
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my only thought would be that the idler pulleys are in a different location on LB7 so the tensioner may interfere with the LB7 idlers or may not have enough throw.
 

byeezy_lb7

Member
Feb 19, 2020
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Reno, NV
I actually talked to Wagler last week about a belt problem and they told me they are currently in the process of having a tensioner finished for the lb7’s soon
I spoke With Austin a while ago when they first released them and he said they would have them for the lb7s shortly after the new year but ya..... still waiting Hahahah (hate waiting).....
 

KyleC4

Tech
Dec 30, 2016
334
6
18
Bay Area
my only thought would be that the idler pulleys are in a different location on LB7 so the tensioner may interfere with the LB7 idlers or may not have enough throw.
Good point here. I’m also curious if what they come up with will work on 01 lb7 since they have the unique tensioner.
 

Bdsankey

Vendor
Vendor/Sponsor
Feb 1, 2018
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Neenah, Wisconsin
I can't comment on their LB7 tensioner but I definitely love my LLY tensioner. My belt hasn't moved since I put it on, before that I was fighting where the belt would shift one rib on my dual fueler setup after a hard 4000rpm+ rip.
 

Chevy1925

don't know sh!t about IFS
Staff member
Oct 21, 2009
17,234
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Phoenix Az
i dont see why you cant just ask andrew or someone at wagler WHY it wont work. Austin has always been real forth coming with me on part questions before i order stuff
 

byeezy_lb7

Member
Feb 19, 2020
32
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Reno, NV
Be prepared to be disappointed unless you plan on fabricating. I'm sure there's a legit reason why they state it wont work.
I was thinking of using an lly alternator bracket and if the idle puller is in a different spot i think routing the belt differently.
 

Bdsankey

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Feb 1, 2018
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Neenah, Wisconsin
I was thinking of using an lly alternator bracket and if the idle puller is in a different spot i think routing the belt differently.
Be aware that you either need to mod the bracket to accept the LB7 CCV or you have to remake your CCV. I do not know if the LLY bracketry is a different offset than LB7 but that would be another thing to check to make sure the belt runs true.
 

ZeroGravity58

Active member
Mar 23, 2008
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Maryland
You need to get a 02 or later alternator bracket and change two idler pulleys. I went through this when I put dual fuelers on my 01. It was a easy swap, then you can use the 02 up tensioners. I used a ATS dual fueler kit for a 01 and it came with the bracket at pulleys. Look up the kit and you will see what you need
 

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Bdsankey

Vendor
Vendor/Sponsor
Feb 1, 2018
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Neenah, Wisconsin
I ordered one last night. . Pricey but if it works and keeps the belt from jumping ribs and keeps it on it will be worth it .
I haven't had any belt shift since getting their tensioner. I'm not saying their tensioner is the "be-all-end-all", but some form of rigid tensioner is what these trucks need with RPM and dual pumps. The factory tensioner doesn't seem to have enough force.

I know Duramaxzak has made his own version of a manual tensioner using some off the shelf parts that seems to be working well for him (LB7). The info is posted in his build thread (LINK).
 

prostreeter600

Street rodder
Jul 18, 2010
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Dallas Tx
I too fabricate a lot of my own stuff but sometimes you have more time than money then sometimes it’s like now where I have more money than time . :thumb:
 

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