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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).
Blueprint detailing the measurements of main bearings for a specific engine unit and chassis.

Identifier  ExFiles\Box 131\2\  scan0212
Date  28th September 1934
  
TITLE: MEASUREMENTS OF MAIN BEARINGS ~ UNIT E.5.G.B. (13101 MILES) CHASSIS B 117 JY.
BENTLEY MOTORS (1931) LTD.

LEGEND:
A.{Mr Adams} MEASUREMENT = DIAMETER OF CRANKSHAFT JOURNAL
B. MEASUREMENT = INTERNAL DIAM: MAIN BEARING BUSH
C. MEASUREMENT = EXTERNAL DIAM: MAIN BEARING BUSH
D.{John DeLooze - Company Secretary} MEASUREMENT = BORE OF CRANKCASE WITH BEARING CAPS BOLTED IN POSITION WITH LINERS

DIAGRAM LABELS: V, X DIAM:, Y DIAM:, CRANKCASE N°, Y DIA., X DIA.

TABLE DATA:

FRONT BEARING:
V DIA: FRONT: B=2.2540, C=2.5985, D=2.5993 | CENTRE: B=2.2530 | REAR: B=2.2540, C=2.5985, D=2.5996
X DIA: FRONT: A=2.2482, B=2.2500, C=2.5990, D=2.5995 | CENTRE: A=2.2482, B=2.2510, C=2.5990, D=2.5998 | REAR: A=2.2474, B=2.2510, C=2.5985, D=2.6001
Y DIA: FRONT: A=2.2482, B=2.2515, C=2.5980, D=2.6002 | CENTRE: A=2.2485, B=2.2510, C=2.5980, D=2.6002 | REAR: A=2.2484, B=2.2505, C=2.5980, D=2.6000
AVERAGE DIA: A=2.2482, B=2.2520, C=2.5984, D=2.5998
DIFFERENCE: .0038, .0014
TOTAL CLEARANCE: .0052

2ND BEARING:
V DIA: FRONT: B=2.2525, C=2.5945, D=2.5970 | REAR: B=2.2515, C=2.5945, D=2.5972
X DIA: FRONT: A=2.2474, B=2.2505, C=2.5960, D=2.5977 | CENTRE: A=2.2480, B=2.2495, C=2.5960, D=2.5980 | REAR: A=2.2466, B=2.2495, C=2.5970, D=2.5988
Y DIA: FRONT: A=2.2494, B=2.2522, C=2.5940, D=2.5980 | CENTRE: A=2.2482, B=2.2510, C=2.5940, D=2.5975 | REAR: A=2.2475, B=2.2505, C=2.5945, D=2.5977
AVERAGE DIA: A=2.2477, B=2.2510, C=2.5951, D=2.5977
DIFFERENCE: .0033, .0026
TOTAL CLEARANCE: .0059

3RD BEARING:
V DIA: FRONT: B=2.2550, C=2.5950, D=2.6003 | CENTRE: B=2.2545 | REAR: B=2.2542, C=2.5955, D=2.5972
X DIA: FRONT: A=2.2466, B=2.2514, C=2.5950, D=2.5975 | CENTRE: A=2.2480, B=2.2517, C=2.5954, D=2.5980 | REAR: A=2.2460, B=2.2510, C=2.5954, D=2.5980
Y DIA: FRONT: A=2.2460, B=2.2540, C=2.5950, D=2.5973 | CENTRE: A=2.2482, B=2.2532, C=2.5950, D=2.5977 | REAR: A=2.2478, B=2.2530, C=2.5952, D=2.5985
AVERAGE DIA: A=2.2474, B=2.2531, C=2.5952, D=2.5981
DIFFERENCE: .0057, .0029
TOTAL CLEARANCE: .0086

CENTRE BEARING:
V DIA: FRONT: B=2.2560, C=2.5945, D=2.6000 | CENTRE: B=2.2550, C=2.5935, D=2.5980
X DIA: FRONT: A=2.2471, B=2.2540, C=2.5950, D=2.5990 | CENTRE: A=2.2482, B=2.2540, C=2.5950 | REAR: A=2.2470, B=2.2540, C=2.5950, D=2.6015
Y DIA: FRONT: A=2.2475, B=2.2550, C=2.5965, D=2.6010 | CENTRE: A=2.2482, B=2.2555 | REAR: A=2.2478, B=2.2550, C=2.5965, D=2.6000
AVERAGE DIA: A=2.2476, B=2.2550, C=2.5950, D=2.5990
DIFFERENCE: .0074, .0040
TOTAL CLEARANCE: .0114

5TH BEARING:
V DIA: FRONT: B=2.2513, C=2.5962, D=2.5983 | REAR: B=2.2508, C=2.5965, D=2.5990
X DIA: FRONT: A=2.2463, B=2.2503, C=2.5960, D=2.5984 | CENTRE: A=2.2480, B=2.2500, C=2.5965, D=2.5985 | REAR: A=2.2470, B=2.2505, C=2.5970, D=2.5990
Y DIA: FRONT: A=2.2477, B=2.2523, C=2.5955, D=2.5988 | CENTRE: A=2.2482, B=2.2510, C=2.5960, D=2.5990 | REAR: A=2.2480, B=2.2490, C=2.5965, D=2.5994
AVERAGE DIA: A=2.2475, B=2.2507, C=2.5961, D=2.5988
DIFFERENCE: .0032, .0027
TOTAL CLEARANCE: .0059

6TH BEARING:
V DIA: FRONT: B=2.2547, C=2.5965, D=2.5971 | REAR: B=2.2548, C=2.5955, D=2.5972
X DIA: FRONT: A=2.2466, B=2.2545, C=2.5950, D=2.5987 | CENTRE: A=2.2480, B=2.2530, C=2.5955, D=2.5987 | REAR: A=2.2470, B=2.2515, C=2.5955, D=2.5985
Y DIA: FRONT: A=2.2478, B=2.2506, C=2.5950, D=2.5978 | CENTRE: A=2.2480, B=2.2510, C=2.5950, D=2.5978 | REAR: A=2.2476, B=2.2512, C=2.5945, D=2.5978
AVERAGE DIA: A=2.2475, B=2.2528, C=2.5953, D=2.5980
DIFFERENCE: .0053, .0027
TOTAL CLEARANCE: .0080

REAR BEARING:
V DIA: FRONT: B=2.2560, C=2.5930, D=2.5962 | REAR: B=2.2535, C=2.5940, D=2.5960
X DIA: FRONT: A=2.2475, B=2.2510, C=2.5940, D=2.5964 | CENTRE: A=2.2480, B=2.2492, C=2.5940, D=2.5972 | REAR: A=2.2475, B=2.2497, C=2.5940, D=2.5976
Y DIA: FRONT: A=2.2480, B=2.2542, C=2.5945, D=2.5973 | CENTRE: A=2.2482, B=2.2557, C=2.5940, D=2.5978 | REAR: A=2.2482, B=2.2560, C=2.5930, D=2.5972
AVERAGE DIA: A=2.2479, B=2.2533, C=2.5938, D=2.5970
DIFFERENCE: .0054, .0032
TOTAL CLEARANCE: .0086

SIGNATURE & DATE (Bottom Right):
[Signature]
28-9-34
  
  


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