ATI Harmonic Dampener

[DBrundage]

Has anyone put a ATI Harmonic Dampener on their 03-07 Cummins?

I just got mine and the directions say that the hub bolts don't come with it and need to be 3/8 longer than OEM. The Service Manual doesn't say what size they are, nor does the ATI data. Thought if one of you gents knew what the diameter and length was, it might save me 50 miles of driving.



ATI dampener for the 03-07 is in two pieces. Looks very straightforward to change. 4 bolts to pull off the old pulley/dampener, after you remove the serpentine belt. 4 bolts 3/8 longer than OEM are needed to attach the ATI hub. Pulley/dampener attach to the hub with 12 bolts/torque bolts. Need an inch/pound torque wrench for the 12 little bolts (torques on pulley decal) and 92 foot pounds on the 4 hub bolts.



Thanks.

D Brundage

 

[Allnew2Me]

Click at the bottom of this post





https://www.turbodieselregister.com...al-topics-inspect-your-harmonic-balancer.html

 

[HEMI®Dart]

It's too late now...

But I would have sprung for the cheaper Viscous type Fluidampr.





re:It uses a steel inertia ring fitted inside a steel housing with a

clearance gap that is filled with a thick silicone fluid, allowing it to

float and mask vibrations over a much larger range of RPM than

the stock, bonded type. Because it is insensitive to any specific

frequency, it is able to self-tune to whatever vibration input it is

exposed to.



But David's write-up says he noticed no difference between the two.



"I would give a slight edge to the

Fluidampr at idle and lower rpm, possibly due to the increased

weight over the ATI. "

 

[Bob4x4]

But I would have sprung for the cheaper Viscous type Fluidampr.





re:It uses a steel inertia ring fitted inside a steel housing with a

clearance gap that is filled with a thick silicone fluid, allowing it to

float and mask vibrations over a much larger range of RPM than

the stock, bonded type. Because it is insensitive to any specific

frequency, it is able to self-tune to whatever vibration input it is

exposed to.



But David's write-up says he noticed no difference between the two.

Unless you have to change the belt and don't want to remove the damper every time... .....

as in life there are always trade offs-

 

[Bob4x4]

Allnew2Me

Thanks for the link,I hadn't tryed the online magazine feature yet. It is much easier reading than the paper version with my old eyes :-laf

 

[DBrundage]

Reply to multiple issues

The TDR article didn't address bolt lengths as an issue as the article was about a '01. It said it comes in 3 pieces, but the 03-07 comes in two pieces and not all bolts necessary.

The fluid viscous damper requires removal to change the belt and I am a disabled vet with arthritic hands- easier is better. Lots of dragsters and racers have used the ATI for years. From a pure physics stand point, I agree the fluid viscous damper is better, but not in my practical case as it is harder to install with my bad hands and it is bigger with less clearance to work. Last thing I need is to have to hassle with this in the field if I break a belt. Price is not that much of an issue in the greater scheme of things.



ATI: $475

Fluidamper: $436



Thanks.

Don Brundage

 

[JSanchez]

Pardon my ignorance fellas, but why does the Fluidampr have to be removed to replace the belt? Cant something more easily accessible be loosened instead?

-J. S.

 

[HEMI®Dart]

Pardon my ignorance fellas, but why does the Fluidampr have to be removed to replace the belt? Cant something more easily accessible be loosened instead?



-J. S.

I am curious about this too. On a 2nd gen 12V. I just have to loosen the engine speed sensor bracket.

 

[Allnew2Me]

On the 2003 and up trucks, the larger diameter of the Fluidampr requires that you install the belt while the damper is loose because of the conflict between the water-pump pulley and the damper. This also means that to change the belt you have to loosen the damper bolts to allow the belt to pass through when removing it. It is not really a big deal, how often do you change your serp belt?



This is not an issue with the ATI because it is of a smaller diameter.

 

[HEMI®Dart]

On the 2003 and up trucks, the larger diameter of the Fluidampr requires that you install the belt while the damper is loose because of the conflict between the water-pump pulley and the damper. This also means that to change the belt you have to loosen the damper bolts to allow the belt to pass through when removing it. It is not really a big deal, how often do you change your serp belt?



This is not an issue with the ATI because it is of a smaller diameter.

Thanks!



Which one do you like? The ATI or the Fluidampr?

 

[HEMI®Dart]

And one more quick note, the only truck to get the "small" damper was the 160 HP '94 automatic trucks. My '94 175 HP 5 speed came OEM w/ the 215 damper. I had ordered a 215 HP damper only to find out the truck had one on it.

 

[HEMI®Dart]

I pulled up my invoice for the Fluidampr when "Jet pilot" had a group purchase back in 1/24/96 $348 to-the-door.

 

[Allnew2Me]

Also the write-up does not say anything about "pinning" the Fluidampr when used for competition on say a 12V that has 4000 RPM governor springs.



Actually it does in this paragraph





"The Fluidampr viscous design has been around since 1946 and

also meets SFI 18. 1 specifications. On any year truck, Fluidampr

recommends the use of their available Cummins pinning kit to pin

the damper to the crank fl ange if RPM are to exceed 3500. The kit

is supplied with a drilling fi xture, bit, and two hardened roll pins. "

 

[HEMI®Dart]

Also the write-up does not say anything about "pinning" the Fluidampr when used for competition on say a 12V that has 4000 RPM governor springs.



Actually it does in this paragraph





"The Fluidampr viscous design has been around since 1946 and

also meets SFI 18. 1 specifications. On any year truck, Fluidampr

recommends the use of their available Cummins pinning kit to pin

the damper to the crank fl ange if RPM are to exceed 3500. The kit

is supplied with a drilling fi xture, bit, and two hardened roll pins. "

Thanks. I missed it