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There is a round metal washer type mounting bracket welded onto the lower pan for the DEF doser. They usually crack horizontally about an inch above this mounting bracket. Usually only 2 inches long . I only found the cracks when replacing DEF doser or changing out DPF filters. Didn’t seem to cause any issues. I’d unhook the batteries and weld it while stil on the truck . 

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9 hours ago, Mackpro said:

There is a round metal washer type mounting bracket welded onto the lower pan for the DEF doser. They usually crack horizontally about an inch above this mounting bracket. Usually only 2 inches long . I only found the cracks when replacing DEF doser or changing out DPF filters. Didn’t seem to cause any issues. I’d unhook the batteries and weld it while stil on the truck . 

YUP! what he SAID!😁 weld it!

Edited by fjh
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If it’s cracked it will be on both sides haha. If you can’t see it I wouldn’t worry about it, or you can try heating it up in spots to see if the crack shows itself. 

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The cracks were not gapped open or leaking that we could tell . I believe it was from the weight of the 2 coolant lines and DEF line hanging unsupported off the end of the DEF doser that caused the cracks. We saw it in both Macks and Volvos. 

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