Any diesel guys or generally motor inclined guys?

[BigVal]

Figured I'd ask here as everyone is helpful although I know it's not a truck site. I have a 24 valve cummins in my truck that eats belts. I replaced the tensioner assembly and belt about 4K ago and the belt is ripping again. Looks like it gets pushed back behind the ac wheel and tears. I figure can't be the tensioner again? I'm gonna pull it and check other pullys after work but figured I'd ask.

[shawnhu]

Figured I'd ask here as everyone is helpful although I know it's not a truck site. I have a 24 valve cummins in my truck that eats belts. I replaced the tensioner assembly and belt about 4K ago and the belt is ripping again. Looks like it gets pushed back behind the ac wheel and tears. I figure can't be the tensioner again? I'm gonna pull it and check other pullys after work but figured I'd ask.

This sounds like an accessory belt/serpentine. Sounds like you have a worn bearing somewhere or a misaligned pulley. Listen for a bad bearing or wiggle all the pulleys for play with the belt off.

Generally, OEM replacement parts are not the issue, but aftermarket parts may not be to spec and cause this.

Sent from my iPhone using Tapatalk

[ny hunter]

I also bad bearing somewhere pulley is not right and eating the belt

[stubby68]

Idler pull is usually the problem

[PREDATE]

The harmonic balancer might be worn.
I'd check to make sure all pulleys are rotating smoothly.Water pump, power steering pump, etc.

[WNYBuckHunter]

Tensioners are a known issue on Cummins engines. A high quality aftermarket usually cures it. Also go with the best belt you can get. Gatorbacks are very good. I need to do the tensioner and belt on my Hemi soon, but mine has over 130k on it. 

[BigVal]

Awesome thanks guys I'll be getting into it tomorrow after work now for sure 

[stoneam2006]

As said above probably a bad bearing. With belt off grab each pull your and give a yank if any move in or out that's the issue more than likely

Sent from my SM-N920V using Tapatalk

[borntohunt10820]

Check all your mounts for ac compressor , power steering pump etc . Anything loose will cause the belt to walk.

[tughillhunter]

Idler pulley more than likely


Sent from my iPhone using Tapatalk

[Jeremy K]

Spin the pulleys by hand with the belt off, the ones that sound like old roller skates should be changed.

[BigVal]

So I pulled the old belt off, spin all pullys and they all check out for tightness, noise and alignment. I put on a new belt and it gets pulled off center after literally 1 minute or less of run time. I suppose it could be idler pully but it is new with only 4K on it. Brining my dad into this one tomorrow 

[stoneam2006]

So I pulled the old belt off, spin all pullys and they all check out for tightness, noise and alignment. I put on a new belt and it gets pulled off center after literally 1 minute or less of run time. I suppose it could be idler pully but it is new with only 4K on it. Brining my dad into this one tomorrow 

And you grabbed and yanked and nothing moved?

Sent from my SM-N920V using Tapatalk

[BigVal]

9 minutes ago, stoneam2006 said:

 

And you grabbed and yanked and nothing moved?

Sent from my SM-N920V using Tapatalk
 

 

Yup all tight 

[stoneam2006]

Yup all tight 

Damn...hope you figure it out.

Sent from my SM-N920V using Tapatalk

[Steve D]

I am not a mechanic but I have seen it where the fan pulley bearing goes bad or the bolts holding the assembly loosen or break and cause the entire fan pulley to wobble causing the belt to come off or break.

[stubby68]

Check the ac  pump. those like to loosen up a little causing the pump to tilt just enough to put out of alignment. Also just because a pull does not make noise or feels tight does not mean it isn't  bad. The belt puts a lot of tension on them look at each one with belt on. check with a square if you can look for any tilt in pully. After you do that go buy a Ford. Just a thought.

Edited November 4, 2016 by stubby68

[BigVal]

Lol.. have a ford that has a built 6.0 in it as well. It'll smoke my cummins but I daily the dodge. Ford is work in progress. Like both but dodge over ford for me.

and both are over 200k the dodge has a bit more 

Edited November 4, 2016 by BigVal

[WNYBuckHunter]

Sounds like you built the wrong engine to me lol

 

I have a buddy that had a 2003ish 3/4 ton Cummins that was built. Upgraded turbo, intercooler, injection pumps, propane and water injection, Bully Dog system, exhaust, all that. One day I raced him with my 10 Hemi Sport (390hp, tuned, exhaust) which is no slouch and he whooped me with a 25 foot beaver tail hanging off the back.

[BigVal]

Yep basically same set up that my ford has, but it's twinned. Bought it mostly built doing rear end when funds allow. The dodge has bigger turbo, efi live, exhaust, fuel system etc. much more reliable.

oh, and they'll both smoke hemis . Lol 

Edited November 4, 2016 by BigVal

[chas0218]

12 hours ago, BigVal said:

Lol.. have a ford that has a built 6.0 in it as well. It'll smoke my cummins but I daily the dodge. Ford is work in progress. Like both but dodge over ford for me.

and both are over 200k the dodge has a bit more 

Sounds like he did it right put a Chevy motor in ford! That Cummins must be stock or in need of some work if the ford smokes it, I have seen some pretty wicked Cummins on stock turbo and a tune.

But the belt issue make sure it is routed correctly I watched a belt eat itself on a ford in 3k miles because the belt was routed wrong over one of the tensioner pulleys. I was surprised it even ran correctly.

[BigVal]

20 minutes ago, chas0218 said:

Sounds like he did it right put a Chevy motor in ford! That Cummins must be stock or in need of some work if the ford smokes it, I have seen some pretty wicked Cummins on stock turbo and a tune.

But the belt issue make sure it is routed correctly I watched a belt eat itself on a ford in 3k miles because the belt was routed wrong over one of the tensioner pulleys. I was surprised it even ran correctly.

It's a power stroke 6.0 diesel with twin turbos no chevy power here lol when set up and running right the trucks a rocket 

Edited November 4, 2016 by BigVal

[Gencountyzeek]

Love me some ford diesels! I have a 2010 6.4l deleted, 4 in flo pro straight from the turbo back, with spartan tuner. Took it to lancaster last year with stock tires. Best time outta 2 runs was a 8.5. That's spinning all 4 tires for the first 100'. A guy my dad ran into at a car show was running a tuned challenger r/t behind us and was complaining to my dad that these big a$$ trucks beat his time by a tenth of a second. Diesels can be crazy fast when setup right. Good luck getting that cummins running right val.

[chas0218]

38 minutes ago, BigVal said:

It's a power stroke 6.0 diesel with twin turbos no chevy power here lol when set up and running right the trucks a rocket 

Haha yeah I figured it was the 6.0 diesel but still wanted to ruffle your feathers a little, my buddy has been a die hard Ford guy and I like to get under his skin when I call him out when he used to have a GM powered mustang. 

Edited November 4, 2016 by chas0218

[BigVal]

lol can't argue the ls motors, I'm not the biggest ford guy myself but I like the trucks (sometimes). Chevy ford and dodge