Cat c15 oil leak from behind fan mount?????

Gasket goes around the stud. Fan hub comes loose and gasket slips. Remove studs and clean with brake cleaner and pack the hole with silicone and replace studs. Or replace the front structure set.

 

The cover gasket

 

I had oil leak under the fan, later saw I was leaking are pressure going down the road. I put the fan on manual,the leak would stop.Replaced the fan hub and all is good. I drove and worked on this for several days and got lucky.

 

I would not pack silicone since I don't know where the silicone is going to end up.


What I will do is remove one stud at a time and clean very good and then put it back with plenty of teflon tape, that's how my friend stopped the same leak on his 5ek, and that's exactly what I'm going to do to my 1LW, I have paid three time to get this fix and all they do is the silicon way, thank god silicone hasn't find it's way to the oil and ending in one of the piston cooling nozzle.

 

let me guess, coming from the top stud on driver side of hub. two ways to fix. the cheap way is to remove stud and clean hole with brake cleaner and fill with silicone adhesive then screw stud bake in. or the expensive way remove the front engine cover and replace gasket. done it many times on some of the trucks I have ran with the silicone, never leaked again.

 

Double nut it. Put two nuts on the stud and lock them together. Then use a wrench on the inner nut to screw it out.