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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).
Further report on the 12-EM 'S' Series trials after 10,000 miles, detailing component wear and failures.

Identifier  ExFiles\Box 53\4\  Scan045
Date  7th December 1923
  
R.{Sir Henry Royce} Wor.{Arthur Wormald - General Works Manager}
CJ. By.{R.W. Bailey - Chief Engineer}
BJ% EF.
Hx. Hs.{Lord Ernest Hives - Chair}
PN.{Mr Northey} Sft.{Mr Swift}
E.{Mr Elliott - Chief Engineer} Rg.{Mr Rowledge}
Wd.{Mr Wood/Mr Whitehead}

Hm{Capt. W. Hallam - Head Repairs}11/EW7.12.23.

Further Report on Trials 12-EM. 'S' Series, after 10,000 Miles Run.

Frame & Fittings. - The largest amount of wear in the front spring shackles is .003". This is considered to be very good.

1 There appears to be a fair amount of slackness on engine controls, but this may not be wear, but due to slack in original manufacture, on account of the rough limits of the drawn tube which is bought outside.

2 The offside front engine guard flange is broken off. The nearside has commenced to crack. The oil pump guard flange is cracked.

Crankshaft Bearings. - The average amount of wear on the crankshaft and connecting rod bearings is approximately .002".

Cylinders. - The average amount of wear in the cylinders is .0015 the maximum being .0025".

3 Valve and Guides. - There has been excessive wear on No.8 and No.12 valves, No.8. showing .006" and No.12 .005". The remainder have only worn up to .0015". No.8 Valve Guide has worn .002" and No.12 - .003". For Nos. 8 and 12 we consider this wear excessive for 10,000 miles.

4 Pistons. - The piston in No.3. Cylinder has seized up at some time during the run, near the bottom of the skirt, and the whole of the rings on this piston are seized in the grooves. They have apparently not been working as piston rings for a considerable time, being entirely blocked with carbon.

The rest of the pistons are in good condition.
The rings on the remaining pistons are all inclined to stick in when cold, but apparently no ill effects have taken place from this

5 Sump Filter. - The union flange has commenced to break away. This occurs fairly frequently.

6 Clutch. - There is slight tendency for the fabric to come loose on the small diamter of the cone.

7 Clutch Trunnion. - G.72. - Wear has taken place in the pivot holes The trunnion screws could go further in, which would give longer
  
  


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