The power steering on my Allis D-15 is leaking from the reservoir. The reservoir is cast iron under the radiator. It looks to be a major task to get it out (removing the front end of the tractor). Is there some liquid sealent that I could put in the reservoir that may seal it without the sealent messing up any other part of the power steering system? I know if I do this I cannot crank the tractor until the sealent dries so that it will not get into the other parts. None of the connections seem to be leaking. The leak is slow (drip, drip, drip)and leaks without the tractor running. The power steering works good and the only problem is the leak.