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Engine Oil foaming issue in Dominar 400.

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  • Engine Oil foaming issue in Dominar 400.

    Hi Friends,

    After a very recent oil change (Liquimolly 10W50 street race), excessive amount of foams are getting generated in the oil, which is visible through the oil inspection window. As the first suspect I monitored the coolant level which is not getting dropped and even the oil filter looks fine without any distortion. Also, any possible head gasket issue is not visible from the outside inspection. So the possibilities of ruling out the coolant getting mixed with engine oil is almost there, even though have not yet looked into the water pump area.

    Also, I noticed that the frequency of radiator fan getting activated has increased for the same distance compared to earlier, which I suspects due to overheating since foams does not allow the heat to escape faster. Also, there is strange throttle lag or missing at low speeds and sometime I could see that the rpm cutoff is not happening very sharply. (There is a visible lag between each cutoff)

    Guyz, what could be other possible root causes for the foaming activity in the Engine Oil? Please help me to troubleshoot as Bajaj dealership technicians are also in dark regarding this behavior. Other than coolant , who else could be the culprit for this strange behavior?

    Any light on the concern will be highly appreciated.

    Thanks and Regards,
    Attached Files

  • #2
    Re: Engine Oil foaming issue in Dominar 400.

    Thread approved.

    Comment


    • #3
      Re: Engine Oil foaming issue in Dominar 400.

      [QUOTE=arunvinod;1395822]Hi Friends,

      1.The visible bubble or water droplets are might be due to coolant mix as water does not mix with oil, keep checking engine oil and coolant level(if possible) level at the start of a day before first cranking the engine, it will give you exact data. Update us if you see the noticeable difference in oil and coolant levels.
      2. Power lag can not be due engine oil as you have not changed oil specifications nor cheap oil filled. Heating issue might due to coolant. check level, change interval, in case of sec. Ownership change it with good one.
      Whatever is the conclusion share it.

      Comment


      • #4
        Re: Engine Oil foaming issue in Dominar 400.

        The foam to a certain extent, also exists during normal operation. I suggest you to check the oil level. Excessive foaming is also caused by overfilled oil as the crankshaft aggressively agitates the oil.

        Comment


        • #5
          Re: Engine Oil foaming issue in Dominar 400.

          Off topic but why is it taking mods forever to approve a new thread.its been almost three days since I created a thread asking for help.mods this is the India's biggest bike forum what's the use if we can only get help after it's too late.

          Comment


          • #6
            Re: Engine Oil foaming issue in Dominar 400.

            [QUOTE=Vishal Wagh;1395864]
            Originally posted by arunvinod View Post
            Hi Friends,

            1.The visible bubble or water droplets are might be due to coolant mix as water does not mix with oil, keep checking engine oil and coolant level(if possible) level at the start of a day before first cranking the engine, it will give you exact data. Update us if you see the noticeable difference in oil and coolant levels.
            2. Power lag can not be due engine oil as you have not changed oil specifications nor cheap oil filled. Heating issue might due to coolant. check level, change interval, in case of sec. Ownership change it with good one.
            Whatever is the conclusion share it.

            >> The bike was inspected by Bajaj technicians for 4 days. They rolled out the possibility of coolant mixing by checking oil filter condition, water pump seals, coolant level analysis, head gasket inspection from outside. Even i don't think its a chemical issue since the foams sets quickly once the engine is stopped.

            They also checked by replacing the current oil with fresh bajaj oil and it was observed that the same behavior exists with the new oil. So, i guess its a mechanical issue rather than a chemical one.

            But, Bajaj technicians claims that this is not an issue, rather expected behavior due to motion of the oil inside the crank. I had even get in touch with the regional are service manager of Bajaj and he also confirms there is not abnormality in this foaming behavior.

            But, i still wonder why this has not happened in that past three years to me and it is not existing in all dominar bikes , both brand new as well as used ones unlike they are claiming its a expected behavior. One thing I can clearly observe that the frequency of radiator fan getting triggered has increased compared to earlier stage.

            Meanwhile, any dominar riders with this behavior seen on their bike please comment here.

            Comment


            • #7
              Re: Engine Oil foaming issue in Dominar 400.

              I'm astonished they spent time studying all that. For some bubbles in the oil.

              You answered it yourself, recent switching to a new oil - bubbles visible in the oil window. Foam is a different thing, it's like what forms in your washing machine or with a hair shampoo.

              From the pic you shared, it looks like only bubbles, and since you switched to a new oil and faced these bubbles, what's with your OCD with those bubbles? Just switch to another oil if you don't like your oil fizzy.

              Comment


              • #8
                Re: Engine Oil foaming issue in Dominar 400.

                Originally posted by Zapps View Post
                I'm astonished they spent time studying all that. For some bubbles in the oil.

                You answered it yourself, recent switching to a new oil - bubbles visible in the oil window. Foam is a different thing, it's like what forms in your washing machine or with a hair shampoo.

                From the pic you shared, it looks like only bubbles, and since you switched to a new oil and faced these bubbles, what's with your OCD with those bubbles? Just switch to another oil if you don't like your oil fizzy.

                >>
                I don't know how your defining or differentiating between foam and bubble. Maybe you could have a clear idea if show you the video. Bubbles for me like those thing pops from the surface and blows, but if you observer the picture you can see bubbles after a foamy layer on top of the oil. Well for me it looks like foams.


                >> You answered it yourself, recent switching to a new oil - bubbles visible in the oil window.
                I think you misunderstood, The oil in which i'm facing this issue was the same oil i'm using for past 2 years (definitely 3 or 4 changes if remember ). And for testing purpose technicians changed to a different oil to check whether the issue persists on another oil. but yes, foams exists with a different oil. So, as I said its not a chemical issue, rather a mechanical one like, air entering into crank somehow causing excessive aeration or something... which i'm not sure even they are.

                >>what's with your OCD with those bubbles?

                The engine is getting hot very frequently , which I suspects since foams reduces heat conducting property in the oil ; Which i guess is not good for the components and its my worry.

                Comment


                • #9
                  Re: Engine Oil foaming issue in Dominar 400.

                  I guess, the image doesn't proves the foam. But since you've seen it and the heating issues. Try to get some feedback on Dominar thread and try to get the bike checked from an experienced mechanic who knows about Dominar.

                  Also, from the pic, it looks like the oil has been overfilled.

                  Originally posted by arunvinod View Post
                  >>
                  I don't know how your defining or differentiating between foam and bubble. Maybe you could have a clear idea if show you the video. Bubbles for me like those thing pops from the surface and blows, but if you observer the picture you can see bubbles after a foamy layer on top of the oil. Well for me it looks like foams.


                  >> You answered it yourself, recent switching to a new oil - bubbles visible in the oil window.
                  I think you misunderstood, The oil in which i'm facing this issue was the same oil i'm using for past 2 years (definitely 3 or 4 changes if remember ). And for testing purpose technicians changed to a different oil to check whether the issue persists on another oil. but yes, foams exists with a different oil. So, as I said its not a chemical issue, rather a mechanical one like, air entering into crank somehow causing excessive aeration or something... which i'm not sure even they are.

                  >>what's with your OCD with those bubbles?

                  The engine is getting hot very frequently , which I suspects since foams reduces heat conducting property in the oil ; Which i guess is not good for the components and its my worry.

                  Comment


                  • #10
                    Re: Engine Oil foaming issue in Dominar 400.

                    Crankcase is always ventilated to release excess air which is coming through piston rings , which ensure no pressure rise by excess air in the crankcase area.
                    As you have done enough checks done inside Bajaj dealership you can relax and ride. If anything goes wrong you have right to call bajaj India. This only applies if this particular issue is mentioned in the previous job cards by dealership by time of checks.
                    Last question how much oil you filled last time when you switched to liqui moly and from where you purchased.
                    Last edited by Vishal Wagh; 11-11-2020, 10:40 PM.

                    Comment


                    • #11
                      Re: Engine Oil foaming issue in Dominar 400.

                      Originally posted by arunvinod View Post
                      Hi Friends,

                      After a very recent oil change (Liquimolly 10W50 street race), excessive amount of foams are getting generated in the oil, which is visible through the oil inspection window. As the first suspect I monitored the coolant level which is not getting dropped and even the oil filter looks fine without any distortion. Also, any possible head gasket issue is not visible from the outside inspection. So the possibilities of ruling out the coolant getting mixed with engine oil is almost there, even though have not yet looked into the water pump area.

                      Also, I noticed that the frequency of radiator fan getting activated has increased for the same distance compared to earlier, which I suspects due to overheating since foams does not allow the heat to escape faster. Also, there is strange throttle lag or missing at low speeds and sometime I could see that the rpm cutoff is not happening very sharply. (There is a visible lag between each cutoff)

                      Guyz, what could be other possible root causes for the foaming activity in the Engine Oil? Please help me to troubleshoot as Bajaj dealership technicians are also in dark regarding this behavior. Other than coolant , who else could be the culprit for this strange behavior?

                      Any light on the concern will be highly appreciated.

                      Thanks and Regards,
                      Once do a engine flush and use new engine oil and see if your problem goes away.

                      Comment


                      • #12
                        Re: Engine Oil foaming issue in Dominar 400.

                        Originally posted by niranjanreddy891 View Post
                        Once do a engine flush and use new engine oil and see if your problem goes away.
                        Newer use engine flush it is not recommended by experts unless until doing engine overall.

                        Comment


                        • #13
                          Re: Engine Oil foaming issue in Dominar 400.

                          Originally posted by Vishal Wagh View Post
                          Newer use engine flush it is not recommended by experts unless until doing engine overall.
                          Everyone have different opinions. I am using engine flush on my 3 bikes since more than 5 years. I use diesel to flush the engine. Nothing has happend till now. No problems from engine side. All the 3 bikes are butter smooth.

                          Comment


                          • #14
                            Re: Engine Oil foaming issue in Dominar 400.

                            Have you been using any fuel or oil additives, then stop it and see if this problem goes away. It can also be due to bad quality of fuel or adulteration.

                            Comment


                            • #15
                              Re: Engine Oil foaming issue in Dominar 400.

                              Originally posted by arunvinod View Post
                              Hi Friends,

                              After a very recent oil change (Liquimolly 10W50 street race), excessive amount of foams are getting generated in the oil, which is visible through the oil inspection window. As the first suspect I monitored the coolant level which is not getting dropped and even the oil filter looks fine without any distortion. Also, any possible head gasket issue is not visible from the outside inspection. So the possibilities of ruling out the coolant getting mixed with engine oil is almost there, even though have not yet looked into the water pump area.

                              Also, I noticed that the frequency of radiator fan getting activated has increased for the same distance compared to earlier, which I suspects due to overheating since foams does not allow the heat to escape faster. Also, there is strange throttle lag or missing at low speeds and sometime I could see that the rpm cutoff is not happening very sharply. (There is a visible lag between each cutoff)

                              Guyz, what could be other possible root causes for the foaming activity in the Engine Oil? Please help me to troubleshoot as Bajaj dealership technicians are also in dark regarding this behavior. Other than coolant , who else could be the culprit for this strange behavior?

                              Any light on the concern will be highly appreciated.

                              Thanks and Regards,
                              I’ve observed the same with my RC390 after switching over to liqui moly 10W50.
                              Ktm service people advised me not to bother about this unless there’s a drop in coolant level
                              Which might need a quick response.
                              Apart from foaming there isn’t any other signs of malfunction relating to this.

                              Comment

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