7040 oil cooler leaks

hey all,

I also managed to get a 7040 going for this round of summer fallow, and hooked it to the smaller set of sweeps. It runs great and did a great job, had to trace an air leak into the fuel supply, but got that taken care of.

anyways, it has an oil leak at the oil cooler. it is the seam between the rear elbow, and the body of the cooler. also getting slight weepage at the tiny hole.

is there an o-ring that goes bad? gasket? or is it the cooler itself?

if its the cooler itself, can a guy leave the housing and change the guts? (it has excellent paint, that is why I ask. :) )

otherwise, I am pretty happy with the old gal, it seems rather peppy and the straight pipe sounds great at 2200 RPM in 4th high under load. :)

The elbo gaskets can be changed without removing the complete cooler. It would be a good time to remove the cooler and replace all 4 orings. MACK

"the O-R on the front water volute will need replaced too."

I assume this is at the front of the engine where it joins into the water pump housing?

how often does this leak? alot of work to get that part of the housing off. :)

I re-read this post, and realized I wasnt very clear at all.

the oil cooler happens to be leaking engine oil, which is probably a whole different ballgame than if it was leaking coolant, correct?

sorry gents!

Well, the original 7040 in this thread finally started leaking worse, and I  bought a new to me 7040 with the same issue, so its cooler re-seal time. :)


Looking at the parts book, http://agcopartsbooks.com/PartsBooksN/Viewer/book.aspx?book=agco/79003880, page 46, is there a gasket to seal part #1 to part #18? They only list #15 as qty 1, so its not that.

Currently the parts list is:
2 each of #8 and #11

#12
#15
#16

Is #13 necessary or can it be skipped? I imagine its a Murphys law deal, it will only leak if you spend the $ on replacing everything else... can a guy coat it in silicone? If a guy does replace it, anything need done to the piece the tube fits into?

I just done this little project on my 7060,,, its not a big a job as it looks,, I think the worst part is having to drain the coolant and replace,, lol,, yes getting the cooler out of the housing can be a little tough, I just lubed the O-rings up real good and all went back together real neat,,,the new O-rings are all black,, so need to watch part numbers an get the right ones in the right place,,  might try a search,,, I don't remember if I put pictures up or not...

The one gasket is "GASKET, elbow to housing (Eff. S/N 70-29018 & Up)" and the corresponding below SN 70-29018

Problem: all our 7040s engine SN's are 3D- instead of 70- They vary from 3D-34728 to 3D-43080.

I assume subtitute 3D for 70, and since all are above 29018 order the newer gasket?

70- would be way newer than any 7040. 

There is an "arrow" on one end of the cooler tube bundle and there is another arrow on the front (inside towards the eng block) of the housing. They need to be close to each other but not perfect. If that cooler core is assembled 180 degrees off, there essentially is little or no oil cooling.

here ya go ACjackmay not be able to see in the picture, but theres an arrow on the little tag on the tubes

Also,

I forgot to ask, if its just seeping a little oil at the connection of the rear elbow and the cooler, can a guy get away with just replacing that gasket?

Everything else is dry on that particular unit.

The gasket is for coolant flow through the elbow into the cooler.  If it is leaking oil the O ring would be the culprit.