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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Test report on Shell Mex 'E.P. Spirax' Excess Pressure Gear Lubricant.

Identifier  ExFiles\Box 145\3\  scan0132
Date  6th May 1937
  
TEST REPORT No. 753.B. (7).

Test on Shell Mex "E.P. Spirax" Excess Pressure Gear Lubricant.

OBJECT OF TEST: To try out extreme pressure oils under conditions of service of Automobile Work, and note the effect of the lubricant on the bearing, and particularly brass cages, arising out of requests by Messrs. Austin Motor Co. and Wolseley Motors Ltd. See our letter to Austin (CGHR/BO) Jan. 12th. 1937, and Mr. Hickling's report on visit to Wolseley Motors (18th Jan.) dated 21st Jan. 1937, ref: FGH/AD. See also Shell Mex Oil Co. correspondence in Tech. Office file, and special "Excess Pressure Lubricants" file.

BEARINGS: 5/MDJT.30. (brass cages).

LOAD: 1050 lbs. Journal. 1420 lbs. Thrust.

SPEED: 4500 r.p.m.

DURATION: 300 hours.

LUBRICATION: Shell Mex "E.P. Spirax" Gear Lubricant. (pump feed). See Drg. T.R.18.B. for arrangement of rig and oiling system.

MAXIMUM TEMP. RISE: 83°F.{Mr Friese}

NORMAL TEMP. RISE: 77°F.{Mr Friese}

SHOP TEMPERATURE: 72°F.{Mr Friese}

GENERAL REMARKS RE TEST:

A pump feed was fitted to obtain a churning effect of the oil, the lubrication of the bearing itself being drip feed controlled by a tap, the bulk of the oil being by-passed into the reservoir.

Temperatures were taken on the outside of the housing, and were satisfactory considering the loads and speeds, as also was the condition of the 5/MDJT.30 bearing, this showing slight pitting which could be expected owing to the severe conditions of the test.

The oil after a run of 300 hours was found to be in excellent condition, and all the working parts of the bearing had been lubricated effectively.

No staining of the inner or outer tracks, balls or cages was to be seen. There was, however, very slight staining on the outside of one of the outers, but this should not be of any detriment to the bearing. No gummy deposit was found on any part of the bearing interior.

CONCLUSIONS DRAWN FROM TEST:

This oil would be satisfactory as a ball or roller bearing lubricant in similar applications on Automobile Work, providing that no factors can be introduced which are likely to cause chemical action in the lubricant, and subsequent corrosion of the brg. parts with which it comes into contact.
  
  


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