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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).
Specification changes for Unit No. 21 (L.H. Chassis 25-MX) parts after a 25,000-mile test, comparing previous and revised specifications.

Identifier  ExFiles\Box 169\1\  img201
Date  26th November 1931
  
To Messrs. from RHC{R. H. Coverley - Production Engineer}/WSC.{W. S. Cassel}

UNIT NO.21. (L.H. Chassis 25-MX.{John H Maddocks - Chief Proving Officer})
Engine and Chassis parts dismantled after
25,000 Miles Test for examination.
Erected to previous specification incorporating
the following..
PASSED TO TEST 21.11.31.

Previous Specification.
Crankcase & Bearings to Drg. A.79019.
1-set Bearings A.78763-70
1-A.78560 Centre Main Bearing Cap - Removed - Cracked.

Connecting Rods to Drg. LeC.2736.
A.79360 Big End Bearings Removed.

Pistons to Drg. A.79533.
1-A.82041 Long Skirt Pistons Removed.

Water Pump to Drg. A.79093.
A.80365 Rotor - removed due to wear.

Spring Drive to Drg. A.79915.
(Low Inertia.)

Revised Specification.
Crankcase & Bearings to Drg. A.79019.
New Set Main Bearings - A.78763-4-5-6-7-8-9-704 (Whitemetal)
New Centre Bearing Cap A.78560.

Connecting Rods to Drg. LeC.2736.
New set Big End Bearings and Liners A.79360-1 (Whitemetal)

Pistons to Drg. A.79533.
1-New A.82041 Long Skirt Piston.

Water Pump to Drg. A.79093.
New Rotor A.80365.

Spring Drive to Drg. A.79915.
(Low Inertia.)
Damping Friction Load set at 16 lbs at 17 1/2 Rad;
Load on Driving Springs.- 23 lbs at 17 1/2 Rad:

-cont'd-
  
  


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