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).
Investigation into exhaust valve stretch and the subsequent fitting of new valves and springs.
| Identifier | ExFiles\Box 10\3\ 03-page119 | |
| Date | 3rd March 1938 | |
| 6SH also 600C To By.{R.W. Bailey - Chief Engineer} from Rm.{William Robotham - Chief Engineer} G.{Mr Griffiths - Chief Accountant / Mr Gnapp} HS.{Lord Ernest Hives - Chair} G.{Mr Griffiths - Chief Accountant / Mr Gnapp} Da.{Bernard Day - Chassis Design} G.{Mr Griffiths - Chief Accountant / Mr Gnapp} Mx.{John H Maddocks - Chief Proving Officer} Rm.{William Robotham - Chief Engineer}10/MR.3.3.38. We have had the following note from caller re exhaust valve stretch:- CHATEAUROUX 8/28.2.38. 26.G.VI - 25/30 HP. VALVES. We have fitted the new exhaust valves, springs, and bottom tappets. We beg to confirm our telegram :- "26G. SATISFIED LOST CLEARANCE DUE SINKAGE NOT STRETCH NOR BOUNCE" The valves removed were no longer when measured on a face plate, than the new ones. The seats showed definite signs of sinkage in direct relation to the amount of tappet clearance lost. The valve seats were not pitted and showed no signs of burning such as would be expected had they been bouncing. The length of the valve springs was measured before dismantling the valves and the exhausts again after fitting the new valves. 1 2 3 4 5 6 1.512 1.527 1.527 1.512 1.434 1.527 1.496 1.496 1.496 7 8 9 10 11 12 1.512 1.512 1.512 1.527 1.512 1.463 1.480 1.496 1.496 We are returning to-day the six exhaust valves removed for your inspection. Rm{William Robotham - Chief Engineer}/IMW.{Ivan M. Waller - Head of Chateauroux} Rm.{William Robotham - Chief Engineer} | ||