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Big Cam Cummins intermix

14525 Views 9 Replies 4 Participants Last post by  NP
Ok, here goes the dumb question of the day. But, I since I don't know I have to ask. My neighbor has a Big Cam Cummins in an older C/O and it started intermixing oil and water. He had another mechanic friend briefly look at it and advised him on what to do, because he did not have the time to fix it. He said pull the manifolds and see which cylinder is bad, pull the pan, the bad cylinders piston and the cylinder head of the bad cylinder. Then replace all bad gaskets and reassemble. I understand the head removal, but why the piston? I'll probably be doing the work on this engine and don't want to take things apart that don't need to. Thank you in advance for all input.
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It is getting oil in the coolant, or coolant in the oil, or both? Before he starts tearing things apart, he needs to do some simple trouble shooting. Give me some more detail and I can point you in the right direction. (14 yrs of my life spent working in a Cummins shop)
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