6.7 fan pulley on a 5.9 engine, will it work?

['strokeThis_'07]

Well, in short, I screwed up. The 6. 7 damper does indeed contact the 5. 9 fan pulley



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You can see that it touches by the slightest bit.



Here's the 5. 9 damper and 6. 7 pulley:

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6. 7 pulley:

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5. 9 pulley:

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Basically, I was more concerned with the actual mounting bracket as well as the size of the wheels; the thickness of each never even dawned on me. As you can see, the 6. 7 pulley is 1/4" thinner than the 5. 9 pulley, and this is what creates the clearance needed between the larger damper and the pulley. The 5. 9 pulley is 1 3/4" thick vs. 1 1/2" thick for the 6. 7 pulley. I apologize for the mistake.



Here is the 5. 9 damper held in front of the 6. 7 damper:

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I was able to pull the 5. 9 damper off, and of course I started to round one of the bolt heads on the 6. 7 damper, so I said screw it and didn't mess with it anymore. The only weight I got for the 5. 9 damper was 14. 8 lbs, which may or may not be accurate. The only scale I have is a joke bathroom scale that I can't seem to get to work It flashed zeros at me 5 times and the only number I managed to get was when I pushed on it some and got the 14. 8...



The 6. 7 damper is 9 9/16" across.

The 5. 9 damper is 8 3/4" across.



Hopefully this clears up the mystery (5. 9 damper/5. 9 pulley. 6. 7 damper/6. 7 pulley)

 

[07 ThunderRoad]

Is the tone ring the same (I know the 6. 7 is attached to the damper). Is the index in the same spot for T. D. C. ? The bottom line is, If I use the 6. 7 damper I need to use the 6. 7 pulley to clear the damper and remove the belt. I would than say that the 6. 7 pulley will give me the extra clearance on the 5. 9 with a fluidamper. Does this sound correct to you 'strokeThis_07?

 

[rscurtis]

That was going to be my question too. If you can use a 6. 7 fan pulley on a 5. 9, then the belt change problem goes away.

 

[seafish]

Well THANKS those are all really good pics.

Pic#1 shows why Xclr8r on CompD was saying that the back tapered edge of the 6. 7 damper needs to be turned down about . 08" to clear the fan pulley... . and it looks like that in fact needs to happen if one uses the 6. 7 damper with the 5. 9 fan pulley.

However, I still cannot tell if using the 6. 7 damper with the 6. 7 fan pulley, would create the necessary clearances??

 

[cerberusiam]

Looks like the 6. 7 pulley depth is less than the 5. 9 and it is set back a little bit more on the support mount. That should give the needed room to clear the 6. 7 damper and allow the belt to changed.



Looks like the belt runs closer to the front side of the 6. 7 pulley also so thats how they got the clearance.



Now I wonder if the fluid damper would work if one swapped to the 6. 7 pulley with the extra room?

 

[seafish]

Looks like the 6. 7 pulley depth is less than the 5. 9 and it is set back a little bit more on the support mount. That should give the needed room to clear the 6. 7 damper and allow the belt to changed.



Looks like the belt runs closer to the front side of the 6. 7 pulley also so thats how they got the clearance.



Now I wonder if the fluid damper would work if one swapped to the 6. 7 pulley with the extra room?

OK... got it now... . so what poeple have been saying is indeed true... swapping BOTH the 6. 7 damper AND 6. 7 fan pulley will allow one to use the upgraded parts on a 3rd gen CTD and still be able to change the belt WITHOUT loosening or removing the damper.

 

[cerberusiam]

OK... got it now... . so what poeple have been saying is indeed true... swapping BOTH the 6. 7 damper AND 6. 7 fan pulley will allow one to use the upgraded parts on a 3rd gen CTD and still be able to change the belt WITHOUT loosening or removing the damper.

From the pictures, that looks to be true. The only thing that might be different is the fan mount dimensions.



Stroke just needs to bolt the 6. 7 stuff onto the 5. 9 to verify fitment.

 

[seafish]

Stroke just needs to bolt the 6. 7 stuff onto the 5. 9 to verify fitment.

I am definitely willing to chip in $10 towards his favorite case or bottle of refreshments as recompense for his extra trouble (like getting out the rounded bolt) !!! Anyone else?? :-laf Oo.

 

[mwilson]

OK... got it now... . so what poeple have been saying is indeed true... swapping BOTH the 6. 7 damper AND 6. 7 fan pulley will allow one to use the upgraded parts on a 3rd gen CTD and still be able to change the belt WITHOUT loosening or removing the damper.

Plus use the same part number fan belt.



Mike.

 

[rscurtis]

Perhaps if the 6. 7 fan pulley is the holy grail it is something that Geno's could source to sell along with the Fluidamper. It certainly would be a consideration in my purchase decision.

 

[Dieselnerd]

You can read about my adventure last week changing a belt, in the rain and yes the fluid damper had to be removed, not just loosened.



This whole thing was caused by a dealer installing a new power steering pump and not getting the pulley in proper alignment.





https://www.turbodieselregister.com...cussions/234483-2003-power-steering-help.html

 

[cerberusiam]

Mike, did you find a part number for the 6. 7 damper? Or do you need a VIN?

 

[mwilson]

Cerb,



Beginning with Post #31, we started with 6. 7 crank damper part number, then we added the other parts further down.

https://www.turbodieselregister.com...95-fluidamper-vs-ati-harmonic-balencer-3.html



Should throw together a summary of the numbers now it looks like a go.



Mike.

 

['strokeThis_'07]

Is the tone ring the same (I know the 6. 7 is attached to the damper). Is the index in the same spot for T. D. C. ? The bottom line is, If I use the 6. 7 damper I need to use the 6. 7 pulley to clear the damper and remove the belt. I would than say that the 6. 7 pulley will give me the extra clearance on the 5. 9 with a fluidamper. Does this sound correct to you 'strokeThis_07?

Yes, the index on the tone rings is in the same spot.



How big is the Fluidamper? I have no experience with one, so not sure on the clearance issue. But I guess Fluidamper needs to be loosened to change belts?

However, I still cannot tell if using the 6. 7 damper with the 6. 7 fan pulley, would create the necessary clearances??

Which clearance, where? Everything should be as factory delivered 6. 7 with the 6. 7 damper and pulley on a 5. 9. I would think if clearance was adequate to change a belt on a stock 6. 7 without removing or loosening dampers, it should be the same on a 5. 9.

Looks like the 6. 7 pulley depth is less than the 5. 9 and it is set back a little bit more on the support mount.

I did measure from the front cover to the rearmost edge of the pulley, and both the 5. 9 and 6. 7 are the same. 1/4" I think?

Stroke just needs to bolt the 6. 7 stuff onto the 5. 9 to verify fitment.

Which stuff where, and what am I looking for?



I've got so many dimensions in my head and bolting this here and that there, I keep getting confused!:-laf

 

[07 ThunderRoad]

Who will be the first to upgrade a 5. 9 to the 6. 7 damper and pulley? Pics would be nice. Also, how much smoother does the engine run? Manual and auto trans trucks would make a good comparison. Is this swap worth it on an auto 5. 9 truck? (I would also like the stars in the sky to twinkle brighter tonight :-laf ).



I want to thank all that have participated in this thread. The information and the questions have been very professional.

 

[cerberusiam]

Which stuff where, and what am I looking for?



I've got so many dimensions in my head and bolting this here and that there, I keep getting confused!:-laf

Pull the 6. 7 damper and fan pulley and bolt them onto the 5. 9 to see if they fit and the belt lines up. Since you have all the pieces thats the easiest to see if the pulleys all align correctly and the belt works.



Booked marked the thread Mike, thought I saw that somewhere and couldn't find it in this thread. Had a senior moment I guess.



Looking online, you have better pricing than moparparts america on the damper, by $100. Sooo, what shipping form Maine to Georgia?

 

[mwilson]

Check with some of the truck dealers, they should be about the same price as we are. Any that are Cummins "B" and "C" dealers can get the parts.



If you don't have good results let me know, I have a soft spot for TDR folk and can get creative... .



Mike.

 

['strokeThis_'07]

Pull the 6. 7 damper and fan pulley and bolt them onto the 5. 9 to see if they fit and the belt lines up. Since you have all the pieces thats the easiest to see if the pulleys all align correctly and the belt works.

I don't see why it wouldn't. I haven't run into any physical difference between the 5. 9 block and the 6. 7 block; everything is the same. Same mounts, same mounting locations, same pulley sizes (again, assuming pulleys on AC/Alt/PS are the same size on a 6. 7; this was stripped of all that when I got it from the salvage yard).



If anyone with a 6. 7 can measure the pulleys on the AC/alt/PS, I can check mine to see if they are the same size (I don't know why they would change).

 

[WOT]

I just looked at my fan pulley on my '07 5. 9 and it looks like it has very little pulley showing in front of the belt. It was built in October of '06 and I'm wondering if there was some mid-year pulley change as it looks more like the 6. 7 pulley picture. The 5. 9 pic you posted appears to have more pulley showing at the front based on the wear marks from the belt.

 

[cerberusiam]

I don't see why it wouldn't. I haven't run into any physical difference between the 5. 9 block and the 6. 7 block; everything is the same. Same mounts, same mounting locations, same pulley sizes (again, assuming pulleys on AC/Alt/PS are the same size on a 6. 7; this was stripped of all that when I got it from the salvage yard).

Except for the depth and offset of the fan pulley and the shape\size of the damper. If you can bolt the 6. 7 damper and fan pulley onto the 03 and they don't touch that is the answer everyone is looking for.