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).
Diametrical clearances for the Phantom III crankshaft bearings.
| Identifier | ExFiles\Box 115\1\ scan0023 | |
| Date | 28th March 1936 | |
| X 1020 To Hy.{Tom Haldenby - Plant Engineer} c. to . c. to Mx.{John H Maddocks - Chief Proving Officer} HB{C. E. Harcombe}/Swdl.{Len H. Swindell}S/JH.28.3.36. Phantom III. Up to the present, the following diametrical clearance have given satisfactory results with the W/M main and big end bearings. (1) Main bearings to have a diametrical clearance on the crankshaft of .00225 +1/2 Existing drawing limits allows for a clearance of .0005 +2 (2) Plain rod big end bearings to have a diametrical clearance of .0015 +1/2 Existing drawing limits allows for a clearance of .0015 +1/2 (3) Forked rod big end bearing to have a diametrical clearance on the crankpins of .002 +1/2 Existing drawing limits allows for a clearance of .001 +1 The details of the bearings, crankshaft and plain rod should come within the above limits. HS{Lord Ernest Hives - Chair}/L.H.Swindall. | ||