In this paper, the basic functions of system lubricating oils for crosshead Diesel engines are explained, and the performance capabilities that such oils must possess, to meet the requirements of present engines and those of the future, are discussed. The various system-oil requirements considered include:--appropriate viscosity for hydrodynamic and squeeze-film lubrication, plus high load-carrying capacity (to protect crosshead and other bearings) and good oxidation and thermal stability; ability to keep the engine interior and circulation system clean; ability to function properly when contaminated by water, and, because of possible contact with water in the centrifuge, to separate readily without emulsifying or losing additive; neutralisation ability (which depends on more than Total Base No. considerations). These and other requirements, and the related laboratory-tests on system oils, are discussed with the aid of photographs and diagrams. The tests include Mobil's special test in which the operational conditions under which crosshead bearings are lubricated are simulated (the Hydraulic Load Rig Test), and also the Mobil tests for measuring various stability characteristics (the Helix Deposit Test and the Spiral Coker Deposit Test). Some examples of the results of these and other tests are presented, and Mobil's general philosophy on testing these oils is briefly discussed. Some of the results refer to Mobilgard 300, Mobil's crosshead-engine system oil, and it is mentioned that this oil was developed on the lines described in the paper. Order from BSRA as No. 53,441.

  • Supplemental Notes:
    • From the Marine Diesel Engine Technology Symposium, 1978.
  • Corporate Authors:

    Mobil Oil Company Limited

    150 East 42nd Street
    New York, NY  United States  10017
  • Publication Date: 1978

Media Info

  • Pagination: 20 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00316638
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Report/Paper Numbers: Conf Paper
  • Files: TRIS
  • Created Date: Oct 8 1980 12:00AM