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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).
Report page discussing lubrication and design of components like propeller shafts, generators, magnetos, and distributors.

Identifier  ExFiles\Box 27\1\  Scan327
Date  10th September 1929 guessed
  
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However, the rubber pipe is good for at least two years, which is about the limit of their experience.

If the axles are to be connected direct to the line the "air-bottles" on the axles should be omitted.

(3) We pointed out that getting under the car to lubricate the sliding joint of the propeller shaft every 1000 miles is a thing which will most probably be neglected.

They have developed nothing for Packard who also use Mechanics joints (but are satisfied with occasional hand lubrication) except in an experimental way. He will look up what records and prints they have of successful experiments in lubricating open propeller shafts and let us have them.

It was suggested that the pumping action of the sliding joint, which necessitates the frequent lubrication, might be used to pump oil to the joint, this oil coming either from the Bijur system or from the interior of the gearbox (possibly by an extension of the latest English scheme for lubricating the clutch coupling). If adequate lubrication can be obtained at the sliding joint, there would be little difficulty in passing a little of this oil to the pins of the universal joints.

(4) Generator. He had no better suggestion than our present double-needle drip plug, and extremely free oil passages away from the bearings.

(5) Magneto. The same method as used for the generator could also be adapted to magnetos, which probably are less liable to trouble from overoiling than the commutator on a generator. In magnetos where several oil passages lead from a single well possibly a "No O" drip plug giving about .08 cc (1-1/2 "drops") per shot would be advisable so that all points will get a little oil.

(6) Distributor. No reason against fitting this with a "No O" drip plug. In theory the fiber rubbing block should also receive a small spot of grease or oil every few thousand miles, but in practice it neither gets it nor seems to need it so long as the cam is highly polished.

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