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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).
Chassis 10 G.III after 2948 miles, detailing the engine condition.

Identifier  ExFiles\Box 4\9\  09-page199
Date  16th April 1926
  
Hotel de France,
Chateauroux, Indre,
France.

To "H.S."
From G.W.Hancock.

Report on chassis 10 G.III. after 2948 miles.

E N G I N E.{Mr Elliott - Chief Engineer}

Power.
Very good. Compressions are even. Engine detonates slightly on pick up. This has not altered from first running of the car over here.

Lubrication of cylinders.
Nos. 2,&6 normal. Nos. 3,&4 streams of oil running down walls
Nos. 5,&1 over lubricated.

Condition of cylinder walls.
These are in good condition.

Valve & fittings.
We have had no trouble with valves. Tappet clearance checked when cold was as follows.

Nos. 1 2 3 4 5 6 7 8
Clearance. .001" .002" .004" .003" .0015" .004" .005" .001"

Nos. 9 10 11 12
Clearance. .004" .001" .001" .002"

These have all been reset to .003". The tappets have been noisy at times when running at high speed. At low speed they have remained quiet. There was a bad oil leak from valve cover.

Pistons.
Pistons are fitted with "L" shape piston rings S.53625:S.53749. otherwise to L.O.P.D.51487.
There is a bad piston knock from No.5 when cold and hot. This can be cut out by shorting the plug. There is a considerable amount of carbon on all pistons.

Plugs.
K.L.G. type plugs fitted. We have had no failure with plugs.
  
  


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