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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).
Inspection report on a C.10 Chassis unit after a 10,000-mile test, detailing the condition of engine components.

Identifier  ExFiles\Box 5a\3\  03-page191
Date  16th December 1931
  
X5840 16.12.31. X5840.
13-3-IV. CHASSIS. C.10. UNIT AFTER
10,000 MILES TEST.
X4663

CRANKCASE AND BEARINGS
Crankcase O.K.
Whitemetal broken away from shell on the following main bearings:-
No. 4. Cap half.
No. 2. Case half.
No. 3. Both halves.
Oil grooves in small bearings cap choked up with deposit.
The interior stationary parts of the engine were generally covered with a film of moist carbon deposit.

CRANKSHAFT
All journals in good condition. A very heavy deposit of sludge was found in the crankpin bores extending into the cavities of the crankshaft oilers.
Deposit in crank journals was also more than usually found after similar mileage.

PISTONS
Heavy "pitchy" carbon deposit on piston crowns. Oil holes in perfect circle rings choked up with deposit.
Pistons otherwise O.K.

CONNECTING RODS
General conditions of connecting rods and bearings good.
Small portion of whitemetal broken away from cap half of No.2. rod bearing.

CYLINDERS
Cylinder bores in good condition. See separate chart for wear.
Cylinder heads in fair condition.

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