#1 fix that sediment bowl and throw that in line filter as far as you can it is one thing causing you a problem. Next look at all the plugs. They should look a little brown on the ends but if any are real clean then you have or may have a coolant leak. You can also pull all the plugs and with them out spin it over and watch for water to spray out of the plug holes. As for the knock that could also be caused by water in one of the cylinders. Many years ago my 841 did about the same thing and I have blown a head gasket and I to have a loader on and did the repair with the loader still on.
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