Duramax Diesels Forum Truck of the Week
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Old 05-24-2018, 09:27 PM
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Default Adding tension to your dayco tensioner

So I needed to add more tension to my belt setup since Im running 149 belt and 02-05 use a different idler pulley setup than the 06-up that doesnt really let you get all the slack out of the belt. This is only an issue if you are like me and have a van thermostat housing and dual fueler

That said, I have a dayco tensioner from autozone that I know a lot of guys run as well to keep the belt on their truck. The two Allen head bolts on the back of the tensioner that set into the recesses of the accessory bracket to key it can be unbolted without anything coming apart. Figure out how much you want to add for tension and redrill holes clockwise from the original holes. I went 3/8 from original. You can go farther than this just by sanding off the stop that keeps you from going too far. Made a significant difference in tension from before



As you can see, I have 4 open holes. First time I added new holes in the wrong direction lol (counterclockwise, dont go that way unless you want less tension)

May not be many guys needing this mod but think this will help those that still have jumping belt issues at high rpm or cant get pulley alignment perfect
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Old 05-24-2018, 10:34 PM
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Hey James does that Dayco have a metal pulley? If so what's the part number by chance? Also great mood I might need this in the future for my setup!
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Old 05-25-2018, 04:36 AM
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Why not go manual like I did with my LS? My belt is tight as fuk!
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Old 05-25-2018, 05:28 AM
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Quote:
Originally Posted by WisconsinHick1 View Post
Hey James does that Dayco have a metal pulley? If so what's the part number by chance? Also great mood I might need this in the future for my setup!
Yep metal pulley
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Old 05-25-2018, 05:45 AM
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What part brand and # did you use on your LS ? Where did you get it if you don’t mind . My brother’s turbo LS is chunking the belt .
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Old 05-25-2018, 06:03 AM
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Quote:
Originally Posted by prostreeter600 View Post
What part brand and # did you use on your LS ? Where did you get it if you don’t mind . My brother’s turbo LS is chunking the belt .
I'll have to go back and look. It's a heafty piece, I love it, minimal loss of boost with standard belt...

I'm about to overdrive it by 10% and go 8 rib so it maybe for sale as its for a 6 rib but it may work, I'll have to see...

Has he gone to an electric water pump? How much rwhp? Most of my friends went to the e water pump to lessen belt strain and keep from cavitatating it at high rpm...
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Last edited by NC-smokinlmm; 05-25-2018 at 06:08 AM.
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Old 05-25-2018, 06:18 AM
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He just purchased it . Trying to get the bugs worked out of it . It’s a 6.0 built 6.0 with a single 83 Bullseye.
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Old 05-25-2018, 07:46 AM
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Quote:
Originally Posted by NC-smokinlmm View Post
Why not go manual like I did with my LS? My belt is tight as fuk!


Dont believe it will work well on such a long belt. The 149 only comes in a normal belt and it stretches quite a bit when hot. Do they even make a manual setup for a dmax?

And yeah Eric, its metal. The pulley you see on mine is metal. If not, I think you can punch the bearing out of the plastic one and put it in the factory steel one so its new
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Mike L is my role model. I want to be like him when I grow up.
James

02 LL7 2500HD CC/LB dmax/alli "The Limo"

BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

best time to date: 12.39

motor died/bent rods = 3/11/11
back from the dead 7:04pm 4/9/2012

Limo is back in the garage, now driving a built chevy tracker
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Old 05-26-2018, 06:38 AM
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Thanks for taking the time to post pics, mines run the same way. It seems ok now but I have not drove it yet since there is no down pipe on it and exhaust will blow on the firewall until I finish building my twin piping. Did you hear your belt squeal under a good load James?
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Old 05-26-2018, 04:57 PM
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Default Adding tension to your dayco tensioner

Quote:
Originally Posted by rcr1978 View Post
Thanks for taking the time to post pics, mines run the same way. It seems ok now but I have not drove it yet since there is no down pipe on it and exhaust will blow on the firewall until I finish building my twin piping. Did you hear your belt squeal under a good load James?

I never did but with me running a solid fan hub now, I wanted to be damn sure it wasnt an issue. I do know it holds less tension before the mod than the original dual fueler belt routing cause it was real close to the relaxed stop when running and hot
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Quote:
Originally Posted by JoshH View Post
Mike L is my role model. I want to be like him when I grow up.
James

02 LL7 2500HD CC/LB dmax/alli "The Limo"

BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

best time to date: 12.39

motor died/bent rods = 3/11/11
back from the dead 7:04pm 4/9/2012

Limo is back in the garage, now driving a built chevy tracker
Tailgate Crew Member #4
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Old 05-27-2018, 07:03 PM
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Quote:
Originally Posted by Chevy1925 View Post
Dont believe it will work well on such a long belt. The 149 only comes in a normal belt and it stretches quite a bit when hot. Do they even make a manual setup for a dmax?

And yeah Eric, its metal. The pulley you see on mine is metal. If not, I think you can punch the bearing out of the plastic one and put it in the factory steel one so its new
After tossing and shredding literally 20+ belts last season on the StarLite truck, we built a mechanical (solid) tensioner while utilizing the 149" belt. Haven't lost a single belt yet. And this belt that's been on it since day 1 with the solid tensioner still looks brand new. We tried 15 different factory style tensioners and added several more idler pulley to no avail. Solid tensioner solved every single problem.
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Old 05-27-2018, 08:14 PM
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Alright guys, you're using old-skool V-belt technology for a serpentine-belt problem tension problem, which I think is brilliant....so would one of you please give us the low-down on just HOW you built the parts to solve this dilemma?
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Old 06-28-2018, 12:27 PM
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Katech engines makes a lot of nice billet manual tensioners not one specifically for a duramax but might be able to get one to work... I used one on my supercharged Silverado and it stopped the belt from slipping.
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