Announcement

Collapse
No announcement yet.

Normal Crankcase Pressure

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Normal Crankcase Pressure

    Could some one please pull there oil cap off with the engine running and tell me what you hear? If you leave the cap loose with the engine running does it blow it into the air?

  • #2
    Here is an example, just wondering if anyone elses oil fill cap behaves like this?
    https://m.youtube.com/watch?v=-KjGekZDmPM

    Comment


    • #3
      Cummins responded to my question and what I am experiencing with the oil filler cap is normal for this engine.

      Comment


      • #4
        That doesn't look good to me. Are you wanting to try like what I always hear as the blow by test?

        Comment


        • #5
          Yes I did the test per the service manual and ended up with 12 inches, the manual said 5.8, but Cummins said not to worry until it is over 28 inches. Right now I am most worried about the smoke out the filler cap and breather. Can someone look at there engine when it is warmed up and let me know if this is normal?

          Comment


          • #6
            My cap flutters just like that upon startup. I haven't tried it warm yet. But it does seem unusual to me because the large engines I have don't do that at all. That being said they don't make anywhere close to the same power/torque per displacement.

            I haven't seen that test in the service manual. I'll have to check it out.

            Any more follow-up with Cummins on this issue?

            Comment


            • #7
              Cummins told me that everything I am experiencing with the new engine is normal. The crankcase is meant to be under a positive pressure and the oil mist out the breather or oil cap is normal. The vacuum pump also makes the crankcase pressure seem higher as it discharges into the crankcase.

              Comment


              • #8
                That's good to know, but it is odd compared to diesels I'm used to.

                Do you think you were at some kind of extreme angle that may have contributed to the first damaged engine? My assumption and from my experience at work, that loss of oil led to a destroyed bushing. I'm wondering if this is a flaw seen at odd angles or something. I've heard of engine damage with the newer 3.6 Pentastar that Dodge uses when they're used at certain angles.

                Comment


                • #9
                  I hope it was not a weird angle that caused it. If so the marketing for a Jeep is a little inappropriate. Cummins recalled the engine and are doing a failure analysis on it. Hopefully it is a one off failure. I have a very noticeable alarm for low oil pressure on my digital dash and have never seen it come on at weird angles.

                  Comment


                  • #10
                    Haven’t tried the test taking my valve cover cap off but my crankcase vent puts out way too much oil into my intake making my inter cooler boots sweat oil and drip. Can someone give me the report help hotline number I can’t seem to find it

                    Comment


                    • #11
                      Originally posted by Jordaddy View Post
                      Haven’t tried the test taking my valve cover cap off but my crankcase vent puts out way too much oil into my intake making my inter cooler boots sweat oil and drip. Can someone give me the report help hotline number I can’t seem to find it
                      I would call up your local Cummins. Please post more too, because I want to know what to look for and if there's a solution. Sorry I can't help. I'm a novice to most of this stuff anyway, I just like diesel powered products.

                      Comment


                      • #12
                        I’ll keep you updated. I did find out due to the vacuum pump it does make the engine have a more positive crankcase but I know that when I use my Jeep to climb up the hill at my work around 1800 rpm I notice the catch can fill half way with oil which for any vehicle is not a good thing my warranty I think is up so I may be screwed even though it is an obvious design flaw on their part

                        Comment


                        • #13
                          The solution to my issue was to vent the crankcase breather to atmosphere. Now people tell me it smells like I have an oil leak. Cummins also recommended a separator, but I don’t really have room for it. FYI this does not meet the emissions, but neither does ripping off the EGR.

                          Comment


                          • #14
                            Originally posted by R2.8Samauri View Post
                            The solution to my issue was to vent the crankcase breather to atmosphere. Now people tell me it smells like I have an oil leak. Cummins also recommended a separator, but I don’t really have room for it. FYI this does not meet the emissions, but neither does ripping off the EGR.
                            If one was to remove their EGR (never had a diesel with one before), would you just use plates on all the ports and maybe like an exhaust style gasket?

                            Comment


                            • #15
                              If one were to do it I would order the non EGR intake and exhaust manifold.

                              Comment

                              Working...
                              X