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).
Extract detailing oil circulation and filter issues on a 200 HP Aero Engine.
| Identifier | ExFiles\Box 16\1\ Scan074 | |
| Date | 12th March 1915 guessed | |
| Extract from Wor{Arthur Wormald - General Works Manager}/CA/19/L/8015 on 200 HP Aero Engine X740 We find that the oil which is fed into the camshaft casing cannot return into the crankcase down the camshaft drives when the engine is running. The thrust washer on the top pinion seems to pump the oil back, as soon as the engine is stopped it can run down. Mr Elliott has instructed slots to be ground in the thrust washer to allow the oil to pass through freely. We find that the gas from the crankcase gets into the camshaft drive and so into the camshaft casing and comes out of the rocker arm covers. It is of course stopped from getting into the camshaft casing as soon as the oil builds up. When we have dismantled the engine this time we find that the camshaft drives and the inside of the tubes covered in rust caused by moisture condensed from the gases. It could be wiped off with a rag because there was oil underneath but there is not sufficient oil on the universal joints. This is the same effect as we get in the distributor on a standard engine if the oil trap does not work, and I think we should try and prevent it by the same means, i.e. allow the oil to build up at the bottom universal joint so that no gas from the crank chamber could get out by that way. We have had the boss on the bottom cover of the oil filter break, this allowed the covers to come loose, they did not drop off but air was sucked in through the top nut which caused the oil pressure to fall off. Mr Elliott is strengthening this part up. X740 Broke across this neck, made of aluminium | ||