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My brother has it for sale in a good price kindly text his number (386) 530-5895

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They are generally found at tractor repair facilities, used mostly on tractors.. However I use two on my build and have the hoses running to the intake.
 

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There are a number of companies who sell those kits. They were used on Case engines which were Cummins. Power Driven Diesel sells them for $250, Diesel Auto Power sells them for $189, Pure Diesel Power sells them for $189, Double Duty Diesel sell them for $495 (they must have been smoking some weed when they priced them), Diesel Power Products sells them for $445 (must be smoking the same weed LOL), and there may be others. 2830784 is the Case/IHC part for the valve cover only. The breather section is 504069558. Not sure if those part numbers include all the bolts and gaskets. Those covers also are found in an Iveco catalog. They made engines under a Cummins license. These were found on the Case 435 3 cylinder skid steer engine and Case 445CT 4 cylinder engine. See drawing below. Messicks sells the 2830784 assembly for $156.31, the valve cover gaskets are part 504053522 don't show a price at this time, 504069558 cap is $68.75, 500315795 O ring is $16.24, 4899110 screws 3 required are $1.13 each, valve cover bolts 4895214 2 required don't show a price, and isolators part 4895360 2 required are $11.45 each (kind of pricey). So the $189 price that several of the dealers have is pretty good so long as it includes all the parts.
 

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There are a number of companies who sell those kits. They were used on Case engines which were Cummins. Power Driven Diesel sells them for $250, Diesel Auto Power sells them for $189, Pure Diesel Power sells them for $189, Double Duty Diesel sell them for $495 (they must have been smoking some weed when they priced them), Diesel Power Products sells them for $445 (must be smoking the same weed LOL), and there may be others. 2830784 is the Case/IHC part for the valve cover only. The breather section is 504069558. Not sure if those part numbers include all the bolts and gaskets. Those covers also are found in an Iveco catalog. They made engines under a Cummins license. These were found on the Case 435 3 cylinder skid steer engine and Case 445CT 4 cylinder engine. See drawing below. Messicks sells the 2830784 assembly for $156.31, the valve cover gaskets are part 504053522 don't show a price at this time, 504069558 cap is $68.75, 500315795 O ring is $16.24, 4899110 screws 3 required are $1.13 each, valve cover bolts 4895214 2 required don't show a price, and isolators part 4895360 2 required are $11.45 each (kind of pricey). So the $189 price that several of the dealers have is pretty good so long as it includes all the parts.
Bought mine from Messicks...
 

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You did very well there. They aren't all that common in the field as they were mostly on skid steers.
GM used a crankcase depression valve, plumbed into the intake of their diesels, I was perhaps one of the first to install a CAC on a 6.5TD...never had residue buildup in air filter or CAC.
 

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I have seen used one on the bay once and awhile for cheap....
 

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I found some at an equipment recycler. I bought two with the breathers and all the bolts for $75 each.
The best way to buy them these days...
 

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I'm coming from a 6.5 background so I wouldn't have the courage to route them to any place before my turbo for fear that everything would turn into a black oily mess.
Crank case depression valve failure on the GM 6.5td leads to the oily mess...
 
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