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Open Roads Forum  >  Class A Motorhomes

 > Cat C-7 Fan Hub Shot Again

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brandt ranch

Tustin Ranch, CA USA

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Posted: 04/07/12 12:16pm Link  |  Print  |  Notify Moderator

CAC?


Brandt Ranchers, and Bailey, the Golden, too!
'05 Expedition 37U, CAT C7/Allison 3000MH
'04 Jeep Wrangler Sahara
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BillofPA

York, PA

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Posted: 04/07/12 12:28pm Link  |  Print  |  Notify Moderator

CAC. Charge air cooler.(in turbo circuit).


Jenny & Bill
2004 H/Rambler Ambassador 34PDD
Cummins ISC330 Allison 6 speed
2003 Chevy Malibu Toad
Our new Yorkie, Daisy.


wolfe10

Texas

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Posted: 04/07/12 12:40pm Link  |  Print  |  Notify Moderator

CAC= Charge Air Cooler= Inter-cooler= After-cooler

All the same thing. It takes hot intake air from the turbo and cools it to close to ambient temperature.

Intake air coming out of the turbo can be over 300 degrees F. Cool air is denser and gives more HP and MPG, hence the use of a CAC.


Brett Wolfe
2003 Alpine 38'


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J Walker

Oakton, Va

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Posted: 04/07/12 01:05pm Link  |  Print  |  Notify Moderator

Although I don't have a CAT engine I was thinking about the serpentine belt length relative to this thread. On my Cummins ISB I changed my serpentine belt last summer using a cross reference Gates belt instead of the Cummins belt. Three weeks ago I started my MH and found the alternator seized. My thought is that the Gates belt was shorter than the Cummins belt. It seemed much more difficult to install because I had to move the tensioner further. I am wiser now and I just hope my water pump didn't get damaged.


Jim Walker
2014 Thor Palazzo 33.2, 6.7 Cummins, 2100 Allison
2009 Malibu


wolfe10

Texas

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Posted: 04/07/12 02:52pm Link  |  Print  |  Notify Moderator

Jim,

Yes, improper belt tension can and will take out bearings.

Causes can be incorrect length belt, incorrect tensioner, use of different than speced alternator, A/C, etc (anything driven by that belt). Additionally, pulley mis-alignment can take out not just the belt, but cause excessive bearing wear.

I know of one manufacturer who had a rash of hydraulic pump failures. The cause-- excessive belt tension. Cure-- re-drill the detent hole in the pump bracket 15 degrees from OE hole to give less (but sufficient) belt tension.

EdNdonna

Tipton,Calif.

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Posted: 04/07/12 04:44pm Link  |  Print  |  Notify Moderator

I just got done putting in a grease able fan hub.
5M-6509... Seal O Ring $3.05
134-5690...Bracket $83.65
6I-9235...Bearing $52.42
123-0856...Shaft $55.81
100-4026...Retainer $87.12
Also a grease hose to reach it easily from Napa auto parts...7151229 $7.99


2006 Fleetwood Bounder 34H Cat C7 300hp

Joeycockerspaniel

Cumming, GA

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Posted: 04/07/12 07:09pm Link  |  Print  |  Notify Moderator

Great info, guys. When I gave the broken serpentine belt to the Cat service Meg, he gave it to one of his guys to go and check to see If they had one in stock, the assumption being that it was the correct belt. So now I need to call the McRae on Monday and make sure that he is going to the book to find the right belt rather than assume that the right belt was in place. The previous repair facility may have installed the wrong belt. Got it. Great conversation. I appreciate the help.

Hank


Hank & Winde
Cumming, GA.
2006 Forest River Charleston
CAT C7


Joeycockerspaniel

Cumming, GA

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Posted: 04/07/12 07:11pm Link  |  Print  |  Notify Moderator

Forgive the auto correctings. I think you get what I was saying.

brandt ranch

Tustin Ranch, CA USA

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Posted: 04/07/12 07:16pm Link  |  Print  |  Notify Moderator

Great info edNdonna.

Looks like it is a change over of a few items but under $300. Can't understand why I got charged about $200 for just my bearing, but when you are stuck in the desert at 10:30 at night, you tend not to complain too loudly.

CAT owners, bookmark this threa.

brandt ranch

Tustin Ranch, CA USA

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Posted: 04/07/12 07:17pm Link  |  Print  |  Notify Moderator

oh, and edNdonna, I almost bought the same floor plan in 2005!

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