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Cummins 4bt3.9 oil leak

mel1981 ยท 2022-02-15 19:21

Looking to identify this part that is leaking on me. It's the part above the oil fill cap. Thanks

Replies3
  1. #1Dave Neubert2022-02-15 21:00

    My guess would be oil pressure sending unit

  2. #2heymccall2022-02-15 21:37

    Using my 3.9 4bt 1845C parts manual, that oil pressure switch should be a 277016A1.

  3. #3Delmer2022-02-15 23:39

    is it leaking from the switch, or is it leaking around the threads? would be odd, but that's what it looks like.