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Teardown and Rebuild

TFaoro
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  • 2 weeks later...
TFaoro

TFaoro

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So I guess today was my lucky day!
Found a clutch for sale which the shop owner said had 4200 miles on it. I think it has considerably less because it doesn't even look broke in. Only missing part was the throw out bearing. The hydros went out and the owner said it didn't engage smooth enough for him so he put a napa clutch in it. 
It's a SB DD3250-6, so I'll need to get an input shaft upgrade, piolet bearing (Just to be safe), a throwout bearing and some new bolts.  Best part is.... 480 bucks!
IMG_20150910_192238_270_zpsoqw5whp2.jpg
 
PP doesn't look broke in
IMG_20150910_192300_707_zpsok9guzze.jpg
 
Pucks look new
IMG_20150910_192345_459_zpsakoot8oq.jpg
 
Flywheel doesn't look broke in
IMG_20150910_192507_567_zpsl4xechdn.jpg
 
Intermediate plate still has machining marks in it that you can't see from the picture
IMG_20150910_192927_649_zpsvd3fbxtm.jpg
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AH64ID

AH64ID

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Ceramic clutches typically are not a smooth engaging clutch.

 

The DD3250-6 has organic materiel on all 4 surfaces and is reported to be a very smooth clutch, albeit just a little noisy.

 

The -6 indicates it is for the 6 speeds with the 1 3/8" input shaft.

 

I did notice that the NV4500 with a 1 3/8" shaft has a part number of -5K instead of -6. I wonder if there is another difference that keeps the -6 from working on a NV4500???

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TFaoro

TFaoro

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Mike, it's half and half. Ceramic pucks on the intermediate plate side and organic on the other. They actually engage very smooth when they are broke in.

 

AH64ID maybe you're confusing it with an older clutch?? Here it is: http://www.southbendclutch.com/newsdd3250.pdf

They are quieter with a damped intermediate plate as well.

 

And the difference in the "code" is one includes a new input shaft assembly. Everything else is the same.

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TFaoro

TFaoro

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Interesting. When I bought my clutch (OFE) I was told that the SDD was a quad organic face clutch.

 

We shall see about the dampened intermediate plate as, from what I have seen on several of them (SBC and Valair), the dampers wear out quickly.

I'm not sure when you bought it, but I'm pretty sure it used to be quad organic. My assumption is they were having problems with the organic face burning?? That's why they went to ceramic....

 

We'll see about the dampers. I'm not too concerned; I doubt you'll be able to hear the clutch over the motor anyway

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Vais01

Vais01

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The DD3250-6 has organic materiel on all 4 surfaces and is reported to be a very smooth clutch, albeit just a little noisy.

The -6 indicates it is for the 6 speeds with the 1 3/8" input shaft.

I did notice that the NV4500 with a 1 3/8" shaft has a part number of -5K instead of -6. I wonder if there is another difference that keeps the -6 from working on a NV4500???

Valair also has a similar clutch and it too is a bit noisy. I have heard they have something that helps but don't, quote me on that.

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Vais01

Vais01

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All of the Valair I have seen are either all organic, or all ceramic. I haven't heard good things about them either. I've never heard anything bad about south bend, especially their customer service!

They have a 50/50 clutch as well. I didn't know until the other night when I looked up their product line.

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