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).
Instructions on plugging rocker arm holes and subsequent engine testing procedures.
| Identifier | ExFiles\Box 72\1\ scan0099 | |
| Date | 2nd December 1925 guessed | |
| (3) Contd. The holes at the valve end of the rockers are to be plugged up with aluminium, 3/16" dia. and should be such that the plug approximately .300" long can be tapped in with a light hammer so that it is just below the surface of the surrounding steel which can then be peaned over to prevent the plug coming out. This work can be carried out with the rockers and shafts in position, but it may be necessary to remove the high tension wiring tube temporarily. As there may be some confusion regarding inlet and exhaust rockers, it should be noted that the position of the rockers, starting from the radiator end of the engine, are in the following sequence:- No. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. Inl.Exh.Exh.Inl.Inl.Exh.Exh.Inl.Inl.Exh.Exh.Inl. The numbers of the rockers to be plugged are, therefore, 1,4,5,8,9,12. It is essential after the above attention to give the car a very good test, i.e. at least 20 miles good hard running (making sure that the ignition plugs are clean and dry before starting the test) so as to ensure that the cylinder lubrication settles down to a normal working condition as effected by the above alterations. Immediately after this run, while the engine is still in a hot condition, take out the ignition plugs and inspect for the presence of oil etc. on the plugs. If O.K. refix the plugs immediately and give the engine a slow running test, i.e. run with the engine idling dead slow, car standing, for about 1/4hr. normal water temperature being maintained. Immediately after this run, accelerate the engine, note the condition of the exhaust for smoke, then stop down and again inspect plugs. The plugs should not show an excess of oil, or the presence of carbon being formed, which may eventually cause missing fire. At the same time the plugs may be slightly damp with oil and not give trouble. If the plugs fulfil this condition, it is considered that the lubrication is satisfactory for all conditions of service running. (4) In the event of the above not being successful in overcoming the trouble, we are afraid there is no alternative but to dismantle the engine and supply and fit the latest type piston rings, a supply of which we are arranging to have sent to the Depots. EP.{G. Eric Platford - Chief Quality Engineer} | ||