Sir, I too am the proud owner of a 2 63 15 MH with the 6, a Reverse-o-torque trans etc... These are wet sleeved motors, they are real solid and all but through the years parts will begin to fail. There are three areas to address when you find coolant in your oil, the head gaskets, the cylinders / seals or the block are the points of failure. I have just run through mine for the same reason and found the seal on the bottom of #3 went out. It is most likely a strait forward fix which is the good news, the bad news is that it will require a teardown. Start with a compression check, fairly easy due to fact that the head has plug holes, if you find a cylinder that is off by say 20% or more then you have your problem located, only question is weather it is the head, gasket or cylinder parts. If all cylinders are equal or close then look at a rebuild kit, you are going to be inside and might as well freshen up the unit while you are there. A few questions, what are the hours on the motor, where are you located in the states and how much do you use the rig? These are real popular motors due to their being used on Oliver’s from the 1650 up to the 1800 or so, and parts are out there. I have a list of dealers with some parts but I am in Florida, you can also contact Agco, they are the new owners of White, Oliver, MM and MF, they have a list of dealers in your area and are on the www. Also this forum is real good for the transfer of knowledge and parts, find the problem and repost for parts. I also have the parts, service and operators manual if you need them for the price of coping them and S&H, just let me know. AT
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