Modifications and testing of a propellor shaft and a rear axle, detailing oil leaks and subsequent repairs.
| Identifier | ExFiles\Box 82\5\ scan0160 | |
| Date | 2nd June 1937 guessed | |
| ( 9 ) PROPELLOR SHAFT. LOP. GB.702. New complete to the above LOP. Standard Production incorporating:- G.56940/I Damper Wheel I/C. G.56942 Flanged Hub. Rm. {William Robotham - Chief Engineer} 201 Mod. to lubrication. The shaft was free from vibration. The sliding joint remained free on the splines and was not disturbed during the mileage. REAR AXLE. LOP. GB.619. N.S.4985 - GL. {G. Linnett} 833. Axle N° 3.B.IV. 10 x 41 Ratio. The following new parts fitted:- G.2019 Standard Centre Casing. G.100824 Standard left hand plate. GB. 1343 Standard Thrust Bearing Housing. G.100832 Standard Inspection Cover. .0250" Studs in Centre Casing for Pinion Housing replacing I.B.A. instructed by Rm {William Robotham - Chief Engineer} /Gry. {Shadwell Grylls} GB.777/8 Oil Pipes. 5/16" Bolts securing tubes to end plate. All nuts on centre casing secured with lock plates to Rm {William Robotham - Chief Engineer} /Gry {Shadwell Grylls} 's instructions. N.S.4985 Modified lubrication to pinion thrust bearing incorporating Perfect Oil Seal N° 237122. Over-run hum at 40 m.p.h. occurred throughout the running. Very bad oil leaks were experienced past the Perfect Oil Seal in front of the pinion housing. The oil was thrown on to the exhaust pipe causing smoke and smell. This leak stopped completely after 4.000 miles and did not occur again, in spite of considerable slack which developed in the thrust bearing. This was dismantled after a total mileage of 5.000. It was found that the front half of the outer thrust race had moved in the housing and the thrust washer had worn down approximately .030". A new thrust washer was made and fitted giving slight end pinch on the race. The bearing itself was not damaged. The inner roller race on the pinion was loose on the diameter and also .004 endways. The nose was knurled and a shim was fitted behind the race giving slight end pinch. It was also found that the Perfect Oil Seal was turning with the pinion. It was suggested that oil leaks stopped when the seal started to turn. It was left like this and no further leaks were experienced. | ||
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).