Engine connecting rod bearing and crankpin wear and dimensions after a mileage test.
| Identifier | ExFiles\Box 101\2\ scan0257 | |
| Date | 9th March 1937 | |
| ENGINE UNIT C17 CHASSIS 22 GJ TEST { 28,923 MILES IN FRANCE. TEST { 1175 MILES IN ENGLAND. DATE - 9-3-37 CRANKSHAFT EB 2687 MATL. VCM TEST No. CONN. ROD BEARINGS EB 2810 MATL. HALL'S METAL CONN. ROD BEARINGS. | NO. | DIA BEFORE TEST | DIA AFTER TEST | OVALITY | MAX WEAR | |---|---|--- |--- |---|---| | | | A | B | | | | 1 | 2.0009 | 2.001 | 1.9995 | .0015 | .0001 | | 2 | 2.0009 | 2.001 | 2.0003 | .0007 | .0001 | | 3 | 2.0009 | 2.002 | 2.0005 | .0015 | .0011 | | 4 | 2.0009 | 2.0015| 1.997 | .0045 | .0006 | | 5 | 2.0009 | 2.001 | 1.998 | .003 | .0001 | | 6 | 2.0009 | 2.0015| 1.999 | .0025 | .0006 | CRANKPINS | DIA BEFORE TEST | DIA AFTER TEST | OVALITY | MAX WEAR | |---|--- |--- |---|---| | | A | B | | | | 1.999 | 1.9988 | 1.9987 | .0001 | .0003 | | 1.9991| 1.9988 | 1.9987 | .0001 | .0004 | | 1.999 | 1.9988 | 1.9988 | NIL | .0002 | | 1.9991| 1.9988 | 1.9987 | .0001 | .0003 | | 1.9991| 1.9988 | 1.9988 | NIL | .0003 | | 1.999 | 1.9985 | 1.9984 | .0001 | .0006 | MAX CLEARANCE BETWEEN CRANKPIN & BEARING | BEFORE | AFTER | |---|---| | .0019 | .0023 X | | .0018 | .0023 ✓ | | .0019 | .0032 | | .0019 | .0028 | | .0018 | .0022 | | .0019 | .0031 | CONN. ROD BRGS. & CRANKPIN DIMENSIONS CONDITION OF BEARINGS WAS EXCEPTIONALLY GOOD | ||
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).