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dsalinas1939
Top Member

USA
1396 Posts
Posted - 04/21/2025 :  11:51:52 AM  Show Profile  Reply with Quote
i have a C2 with cummins 6.7 isb its leaking def from bottome center of filter cap so i figured the cap was cracked got a new one put it on and its still leaking from same place bottom center of cap i see there is some kinda plug in bottom is that a drain but being its a new cap wouldnt think it would leak anyone run into this

Bluenozer
Top Member

Canada
701 Posts
Posted - 04/22/2025 :  04:04:50 AM  Show Profile  Reply with Quote
Technical Service Bulletin: TSB180139 Released Date: 11-Nov-2019
UL2 DEF Dosing Unit External DEF Leaks
says the freeze rubber in the cover will crack not sure if it gets cut on install
OEM trained in wiring and all engine platforms for over 20 years
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dsalinas1939
Top Member

USA
1396 Posts
Posted - 04/22/2025 :  04:50:56 AM  Show Profile  Reply with Quote
the one i took off was cracked have to take new one off and see if its cracked uggggg
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