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).
Investigation into an oil leak from the crankcase to the flywheel case on a 20 HP chassis.
| Identifier | ExFiles\Box 103\2\ scan0207 | |
| Date | 2nd October 1929 | |
| X 5000. For prints see original. To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux} c. SS.{S. Smith} c. WGT. E.{Mr Elliott - Chief Engineer} c. De. Ey. Hs{Lord Ernest Hives - Chair}/GWH{George W. Hancock - Head Chateauroux}/AM2.10.29. RE : OIL LEAK FROM REAR OF CRANKCASE INTO FLYWHEEL CASE ON 20 H.P. CHASSIS. ------------------------------------------- The Test Dept. complained of this oil leak from the rear of the crankcase. We have also reported upon it during our 10,000 miles test. It has been consistent on both chassis for some time, chiefly after long runs on the road. It does not exist whilst running the engines on the test bed, but does slightly when the chassis is on the dynamometer. The oil leak therefore, is caused by conditions arising which does not exist when the engine is on the test bed. The test bed conditions are, the engine is entirely open and in a still atmosphere, there is no bonnet, and no dashboard. The wind pressure from the open fan is negligible. We find under these conditions with an engine speed of 2500, we have a depression in the crankcase of .150" of water and .125" of water depression in the flywheel case. The difference in the depressions between the crank and flywheel cases is not sufficient to defect the pumping effect of the screw and no appreciable oil escapes or leaks into the flywheel case. The road conditions are, engine enclosed by the bonnet, radiator and shutters, dashboard undershields etc. This alters the condition under which the engine runs in, | ||