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 vehicle setup specifications, adjustments, and modifications.
| Identifier | ExFiles\Box 146\5\ scan0342 | |
| Date | 26th April 1940 | |
| - 2 - 5. The tappet clearances, when set cold, should be 0.008. However, we recommend that they should be set at 0.010 when hot. 6. The instruction book is not yet available. 7. With the engine stationary the clutch pedal should have 1.00" of free movement if lifted from its normal position to its highest possible position. 8. Normally we would not expect you to need a stronger setting of the carburettors. However, you may have some peculiar petrol so we are sending you under separate cover two needles size B.3D to replace your existing B.3.E. 9. Normal clearance between linings and drums 0.020 in off position. 10. New brake linings expand slightly during the first 200 miles of use so to allow for this the adjusters should be moved back two clicks (two quarter turns) when the linings are new. When the linings have done more than 500 miles it is not necessary to move the adjusters back. In addition to the above points there are the following: 11. There will be a modification required on the starting carburettor to prevent freezing up in humid and cold weather. The details of this are not yet available but will be sent on later. 12. We have found that front end suspension knocks can arise from end play of the front shack dampers in excess of 0.002. If your dampers have more than this we recommend that you have the end faces of the internal steel rocking levers chromium or copper plated to reduce the clearance, or, alternatively, fit loose steel washers if the clearance exceeds 0.010". 13. Shock damper bores should be round and parallel to 0.0005". The piston clearance should be 0.0005" - 0.0015" in diameter. As you suggest in your memo, the cap on the end of the shock damper valve should be prevented from turning by being pressed into the two grooves in the valve stem. It should have 0.005 clearance with the end of the valve guide when the valve is seated. | ||