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).
Cylinder wear measurements and valve conditions.
| Identifier | WestWitteringFiles\N\July1925-September1925\ Scan105 | |
| Date | 12th June 1925 | |
| R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: RH{R. Hollingworth}62/BE24. 7.25. Cyl. contd :- -> there being no signs of water leak. Valve seats show signs of pocketing. Valve guides O.K. Cylinder blocks were fitted with copper water jacket tubes. These have stood up very well and are still quite sound showing no signs of water leak on test. We have had cylinders measured up for wear and they come out on an average of .003. No.1. cylinder. Mouth - 3.000 Centre - 3.00175 Crown - 3.005 Average - 3.00225 Var. .005. No.2. cylinder. Mouth - 3.000 Centre - 3.0015 Crown - 3.003. Average - 3.0015 Var. .003. No.3. cylinder. Mouth - 3.001 Centre - 3.002 Crown - 3.003. Average - 3.002 Var. .002. No.4. cylinder. Mouth - 3.000 Centre - 3.001 Crown - 3.00375 Average - 3.0015 Var. .00375 No.5. cylinder. Mouth - 3.000 Centre - 3.001 Crown - 3.002 Average - 3.001 Var. .002 No.6. cylinder. Mouth - 3.000 Centre - 3.0015 Crown - 3.004 Average - 3.00175 Var. .004 ********************** Valves and fittings. General condition of valves and fitts. very good. No broken springs. Nos. 9 and 12 valves have not been seating properly. contd :- | ||