Oil leak 806 Diesel....

Don"t know the correct name for the 1 1/8" or so tube that connects at the back of the engine oil pump then up turns with a 90 then ties into the casting on the back side of the oil cooler. Anyway, the I have a leak from the tube on the back side of the joint that ties to the casting with 2 bolts. It will leak a 1/2 cup or so before the motor gets warm enough and some times it stops after the motor is at operating temp. I have replaced the orings three times in the lst year or so. When I had the tube off I assembled it and made sure there wasn"t any thing bent out of place. When I bolted it together there wasn"t any binding at all. Where the o ring sets it looks fine, no groove at all. Still leaks in the same place. The last two times I replaced the O rings I took rtv silicone and run a good bead around the outside of the tube into the groove where the tube sets. Let it dry several days before I started the tractor and within 5 minutes it was leaking again from the same spot on the back. Is there a lot pressure and oil flow in this tube? Do I need to just get a new tube and end piece and start over? Can I put a small bead of rtv on the O ring itself before I put it together? The bottom o ring at the oil pump holds fine. Thanks for any and all help!! funtwohunt

I had the same problem with 1256.I finally put genuine IH Orings(thay did the trick)on it.The common Generic Orings(from a JD dealer)aen't not quite right-too soft,small,etc.Go with genuine CNH (IH) Orings

Delta, I got the IHC orange ones the first two times. Didn"t seem to make any difference. At loss of what to try except for replace with new. What is that tube called? And what is the purpose for it? Thanks, funtwohunt

Find a back up washer and install it behind o-ring. Many hydralic cyl etc use that set up. I can't point you to a specific part number but a good parts man could help you out. Another thing, make sure when you install the o-ring you are not putting a twist in it. Run a small tool like a o-ring pick under it and roll it around a few turns.