ABSTRACT
Serious leakage problems as a result of deposit formations on mechanical seal surfaces were experienced in actual operation of heavy duty diesel engines. Concerning the cause of these troubles, the action of Cu, Fe, Ca and P ions are concluded to be responsible for deposit formations based upon some chemical analyses. In order to confirm this conclusion, basic laboratory tests were carried out.
From the results of the reproducible tests, it was clarified that the deposit formation on sealing surfaces was closely related to the electro-chemical properties of carbon materials and was promoted by the self-catalytic reactions. In this paper, the countermeasures are also discussed in electrochemical aspects.
