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).
List of checks and modifications for engine valve gear lubrication and oil consumption.
| Identifier | ExFiles\Box 155\2\ scan0079 | |
| Date | 19th April 1937 guessed | |
| -2- (3) With silencing system check valves for bounce. (4) Check valve gear for noise with settings of .008, .012, .016, .020. (5) Lubrication of valve gear. In present form the amount of oil to the valve tips appears O.K. Push rod supply in excessive. Try reducing by sweating up the existing .055 holes in the rocker and redrilling .032 dia. There should be no oil drip on to the springs under any condition. Does the head build up oil levelwhen starting cold? When the oil supply to the push rods and the valve tips has been corrected to the desired flow, do the bottom coils of the valve springs get submerged in oil? a How much would the base of the spring have to be lifted to be clear of oil? When finished we should like to have the following pressures say at 4000 R.P.M. - 100°C inlet temp. Main 30 lbs.sq.in. - rockers 4 lbs. sq.in. Alternative rocker pressure springs are available. (6) What tappet clearance is necessary in order to obtain slow running on a par. with std. Phantom III. (7) Note high speed overoiling and which pair cylinder appear worst offenders. (8) After correction of rocker oil supply does engine overoil after idling for long period, then opening up. (9) Check for periods with "Buick" harmonic damper throughout the speed range. (10) Check for piston knocks cold. (11) Run 1 hr. oil consumption and repeat for consistency. B.9. Oil consumption tests to be continued including a trial of tin plated pistons. | ||