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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 the effect of Duckham's 'Sirrom' X.S. Press Oil on bearings.

Identifier  ExFiles\Box 145\3\  scan0124
Date  23th February 1937
  
TEST REPORT 753.B. (1). +202 1235 23rd Feb. 1937.

Test on Duckham's "Sirrom" X.S. Press Oil (Rig No. 2.)

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 bearings, and particularly brass cages, arising out of requests by Messrs. Austin Motors Ltd., and Wolseley Motors Ltd. See our letter to Austin (CGHR/BO), Jan.18th 1937, and Mr.Hickling's report on visit to Wolseley Motors (13th Jan.) dated 21st Jan. 1937. Ref. FGH/AD.

Bearing. 5/MDJT.30. (Brass Cages).

Load. 1050 lbs. Journal. 1420 lbs. Thrust.

Speed. 4500 r.p.m.

Duration. 300 hours.

Lubrication. Duckham's Sirrom X.S. Press oil. (Pump Feed). See Drg. No. T.R.15.B. for arrangement of rig and oiling system.

Max.Temp.rise. 85ºF.{Mr Friese}

Normal Temp.rise. 83ºF.{Mr Friese}

Shop Temp. 70ºF.{Mr Friese}

General Remarks. 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 heavy tracking and slight pitting. The oil, after a run of 300 hours was found to be in excellent condition and all the working parts in the rig had been lubricated effectively. No staining of inners, outers, balls or cages was to be seen.

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


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