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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).
List of proposed tests and modifications to diagnose and rectify engine vibration issues.

Identifier  ExFiles\Box 137\4\  scan0078
Date  15th January 1930 guessed
  
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(6) Re-fit rear of flywheel. Remove rear piston & rod. Observe effect on amplitude. This will upset the balance of the engine as a whole and may possibly render it difficult to separate any individual effect on the flywheel.

(7) Remove all pistons and rods.

(8) Possibly try fitting rear piston and rod only.

(9) If vibration still persists on test (7) with no pistons and rods, we might try a bare crankshaft with added balance weights.

(10) Try removing rear main bearing liners. Remove bearing cap and block up oil pipe.

(11) Try plain parallel shaft. One of these should still be in existence.

(12) Skim supporting plate of flywheel G.51212 which bolts on to crankshaft until it is only about .062 ins. thick. This should render it very flexible and thus tend to isolate it from the crankshaft.

(13) If test No.(4) does not produce much effect, take front of flywheel G.51212 and skim off the majority of its weight. Determine the moments of inertia before re-fitting.

(14) Fix up some kind of ball bearing as a steady on the projecting spigot at the rear of the clutch. Although this appears most promising, it is the most inconvenient to have to accept as a cure.

(15) If test No.(11) is a cure and test No.(7) is not, we might make a good fitting bar and force it in the last two or three journals to stiffen them considerably in bending.

(16) We believe the flywheel rotates as though the crankshaft were bent, and we ought to find out the method in which the last crank is distorted, i.e. measure the phase angle between the last crank and the points of maximum lateral deflection at the flywheel rim.

contd.
  
  


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