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).
Diagram of the Bentley 7 Unit wheel case gears, detailing backlash measurements and material specifications.
| Identifier | ExFiles\Box 136\1\ scan0172 | |
| Date | 7th December 1935 | |
| -BENTLEY. 7. UNIT.- - BACKLASH OF WHEEL CASE GEARS - - ASSEMBLED - GEARS FITTED NEW 12:9:34 BACKLASH (NEW) .002" (APPROX) ALL GEARS CRANKSHAFT GEAR. E.B. 1858 MATL S/2N CAMSHAFT GEAR: E.B. 1859. MATL FABROIL DYNAMO DRIVE GEAR: E.B. 1862 MATL S/2N IDLER GEAR. E.B. 1864 MATL S/2N WATER PUMP DRIVE GEAR: E.B. 1865. MATL FABROIL. BACKLASH .007"-.012" WITH IDLER GEAR FIXED BACKLASH: .0105"-.014" WITH C'SHAFT GEAR FIXED BACKLASH: .0035"-.009" WITH C'SHAFT GEAR FIXED BACKLASH .004-.011 WITH CRANKSHAFT GEAR FIXED WATER PUMP DRIVE (FABROIL) IDLER GEAR (S/2N) CAMSHAFT DRIVE (FABROIL) DYNAMO DRIVE (S/2N) CRANKSHAFT GEAR (S/2N) 7:12:35 | ||