Development of a Bearing Support Deposit Test.
Technical rept. 1 Jan 67-1 Jun 68,
SOUTHWEST RESEARCH INST SAN ANTONIO TX
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Equipment and procedures are described for conducting a lubricant deposition test featuring the No. 2 rear bearing support from a J57 jet engine as the deposit rating surface, using test conditions approximating those that occur in engine service. Tests conducted at a sump temperature of 350F and at bearing support temperatures of 500, 525, and 550F, for a 48-hr test duration, all show general correlation with the 48-hr 350500F bearing deposition test. The severity level of the 350525F bearing support deposit test is roughly comparable to that of the 350500F bearing deposition test. The 350500F bearing support deposit test is less severe, while the 350550F bearing support deposit test is more severe than the 350500F bearing deposition test. The addition of an independently heated hot spot increases the deposition depending on the temperature of the hot spot. The precision of the test, using direct electric heating of the bearing support test specimen, is similar to that of the bearing deposition test. Author
- Lubricants and Hydraulic Fluids
- Jet and Gas Turbine Engines