400 ISL Front motor mount

[SteveQAR]

Hi all, Would the front motor mount be a oil fill mount? It look like it is leaking oil 

[vito.a]

As far as I know Monaco and Cummins did not  use an oil filled motor mount.  But, there is a breather low on the passenger side of most Cummins engines installed in motorhomes and it will certainly blow oil out down there.  

[Jdw12345]

I’m guessing it’s just normal engine/oily crud from thee environment it lives in, mine has some oily stuff on mine too, could be just the front main seal leaking a bit, leftovers from the blow by etc…….

 Unless it’s Wet and dripping it probably just the nature of the beast…. IMO.

[Georgia Mike]

14 hours ago, SteveQAR said:

Hi all, Would the front motor mount be a oil fill mount? It look like it is leaking oil 

I have had the same issue on my ISL. It never drips any oil on the ground so I didn’t worry about it. I finally cleaned the area up a few months ago and no signs of any oil there now. I’m not sure where it was coming from either.

[SteveQAR]

I clean the area with brake clean. Was idling for over a hour yesterday and no leaks. will take for a ride today

[dl_racing427]

On 10/26/2023 at 6:46 AM, SteveQAR said:

I clean the area with brake clean. Was idling for over a hour yesterday and no leaks. will take for a ride today

Be aware that excessive idling is very harmful to diesel engines, especially with the newer fuel formulations.