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).
Crankcase oil leak on the Goshawk 11 engine and proposing a modified cover design.
| Identifier | WestWitteringFiles\H\March1922\ Scan17 | |
| Date | 17th March 1922 | |
| TO Da.{Bernard Day - Chassis Design} from E.{Mr Elliott - Chief Engineer} c. to Gd. c. to Wer. c. to Hy.{Tom Haldenby - Plant Engineer} c. to Hs.{Lord Ernest Hives - Chair} ✓ ORIGINAL E1/M17.3.22. GOSHAWK 11. CRANKCASE OIL LEAK. XC4220 With reference to the rear end of the crankcase this still seems to give some trouble as regards leaking oil. Owing to the inaccessibility of this portion of the engine we understand that it is very difficult to observe what is happening. There are two possible reasons which appear to us as likely to give trouble:- (1) The joint between the upper and lower halves of the rear end cover may not be good although we think the joint between the upper and lower halves of the crankcase is probably quite sound. Oil would then run down the inner face of the rear end cover and leak out of the horizontal joint. (2) Assuming the joint bad as in (1) between the parts of the cover, oil may be driven out centrifugally through the joint by the rotating flinger on the crank. With a view to producing a cover which will keep the oil in independently of the horizontal joint we have made design No. Lec 1538 in which the upper half overlaps the lower half and in which metal is added to the crankcase facing to form a joint at one end with the overlapping wing. We suggest that either an existing cover should be altered on these lines to test the value of this modification or a new cover be prepared to Lec 1538 and test it. If the oil escapes by method No. 1, then this cover should be effective, but if the oil escapes by method No. 2, there may still be some leakage of oil. (1) | ||