3126's had so many failures that Cat came out with a steel line to upgrade it. I fixed a lot of 3126's that had that hose collapse internally and cause intermittent issues. On a C7, the high pressure oil line from the pump to the head should be a steel line, if its rubber, I'd pull that off and check it really good. Unfollow iapcv for 3126 cat to stop getting updates on your eBay Feed. 0 results for iapcv for 3126 cat Save iapcv for 3126 cat to get e-mail alerts and updates on your eBay Feed. The most noticeable difference between the CAT 3126 and CAT C7 is within the valve train. The cylinder heads are slightly different in the common rail design, still 3 valves per cylinder but there is no oil rail cast in the CAT C7 cylinder head.
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