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).
Standardisation of tappets and push rods for the Wraith III and B.III chassis.
| Identifier | ExFiles\Box 158\4\ scan0256 | |
| Date | 9th August 1938 | |
| To BF & Rm.{William Robotham - Chief Engineer}......From RHC.{R. H. Coverley - Production Engineer} 1360 RHC.{R. H. Coverley - Production Engineer}1/MC.9.8.38. CAMWHEEL TAPPETS & PUSH RODS - WRAITH III. & B. III. In reply to Ey.9/N.13. 7. 38., we have looked into the question of standardising the shortened push rods and modified tappets to ECD.775 and 795., and find that these may be conveniently introduced without scrap at the first chassis in 'C' series. It is not possible to introduce the modifications before this point without seriously dislocating production because the cylinder head and block jigs require alteration, which would in turn retard the machining programme of these major components. The chassis cost should not be appreciably affected by the new tappet design, but the cost of modifications to cylinder block and head patterns and jigs will be in the neighbourhood of £90. 0. 0d. The further proposal to provide a flat lower tappet face and vertical crankcase tappet holes, will provide a saving of 2/6d per chassis due to the simplified tappet grinding, but involves an additional tool charge of £25. 0.0d for alterations to crankcase jigs which will be recovered after producing 200 chassis with vertical tappets. The flat faced tappet should therefore be introduced along with the shortened push rods at the first chassis in 'C' series. RHC.{R. H. Coverley - Production Engineer} | ||