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).
Crankshaft bearing clearances for a Phantom III Unit Nº3, with wear measurements taken before and after a 10,000-mile road test.
| Identifier | ExFiles\Box 91\3\ scan0047 | |
| Date | 5th August 1936 | |
| PHANTOM III UNIT Nº3 CRANKSHAFT BEARING CLEARANCES. BEFORE & AFTER 10,000 MILES ROAD TEST. CRANKSHAFT: E.86615 - Y.C.M. (VK.2888) MAIN BRGS: E.84771 - WM/T BIG END BUSHES: E.84683-4 - WM/T PLAIN CONN-RODS: E.86118-SIN (MARINE TYPE) Vertical text on right: 11044 TABLE: BRG Nº | WHEN MEASURED | JOURNAL MAIN BRG DIA. | JOURNAL MAIN BRG BORE | JOURNAL MAIN BRG CLEARANCE | CRANKPIN BIG-END DIA. | CRANKPIN BIG-END BORE | CRANKPIN BIG-END CLEARANCE | OUTER DIA CONN ROD BUSH | BORE OF PLAIN ROD | CLEARANCE ---|---|---|---|---|---|---|---|---|---|--- 1. | BEFORE | 2.7488 | 2.7513 | .0025 | 2.2489 | 2.2513 | .0024 | 2.7486 | 2.750 | .0015 | AFTER | 2.7486 | 2.7515 | .0029 | 2.2488 | 2.2517 | .0029 | 2.7484 | NIL. | .0016 | WEAR. | .0002 | .0002 | | .0001 | .0004 | | .0001 | | 2. | BEFORE | 2.7488 | 2.7513 | .0025 | 2.249 | 2.2513 | .0023 | 2.7485 | 2.750 | .0015 | AFTER | 2.7484 | 2.7523 | .0039 | 2.2489 | 2.2516 | .0027 | 2.7483 | 2.7501 | .0018 | WEAR. | .0004 | .001 | | .0001 | .0003 | | .0002 | .0001 | 3. | BEFORE | 2.7488 | 2.7513 | .0025 | 2.2491 | 2.2513 | .0022 | 2.7485 | 2.750 | .0015 | AFTER | 2.7485 | 2.752 | .0035 | 2.2489 | 2.2518 | .0029 | 2.7485 | 2.7502 | .0017 | WEAR. | .0003 | .0007 | | .0002 | .0005 | | NIL. | .0002 | 4. | BEFORE | 2.7489 | 2.7513 | .0024 | 2.249 | 2.2513 | .0023 | 2.7485 | 2.750 | .0015 | AFTER | 2.7486 | 2.7517 | .0031 | 2.2489 | 2.2516 | .0027 | 2.7485 | 2.7502 | .0017 | WEAR. | .0003 | .0004 | | .0001 | .0003 | | NIL. | .0002 | 5. | BEFORE | 2.7488 | 2.7513 | .0025 | 2.249 | 2.2513 | .0023 | 2.7485 | 2.750 | .0015 | AFTER | 2.7484 | 2.7516 | .0032 | 2.2489 | 2.2517 | .0028 | 2.7482 | 2.7501 | .0019 | WEAR. | .0004 | .0003 | | .0001 | .0004 | | .0003 | .0001 | 6. | BEFORE | 2.7488 | 2.7513 | .0025 | 2.249 | 2.2513 | .0023 | 2.7485 | 2.750 | .0015 | AFTER | 2.7483 | 2.752 | .0037 | 2.2489 | 2.2517 | .0028 | 2.7484 | 2.7501 | .0017 | WEAR. | .0005 | .0007 | | .0001 | .0004 | | .0001 | .0001 | 7. | BEFORE | 2.749 | 2.7513 | .0023 | | | | | | | AFTER | 2.7487 | 2.752 | .0033 | | | | | | | WEAR. | .0003 | .0007 | | | | | | | | ||