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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).
The performance of shackles, oil types, filters, and other components related to the Bijur lubrication system.

Identifier  ExFiles\Box 27\1\  Scan036
Date  1st February 1929 guessed
  
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(4) As you know we use the threaded front shackles and these will run without oil indefinitely. The rear spring front shackle and center pivot are shielded and have big oil films. We do not find that they lose their oil fast. But the pivots are not hardened and prolonged neglect will cause them to "pick up." This has not happened since fitting the Bijur system. Rear spring front shackle pins are not threaded. With central lubrication these scarcely show a mark after 30,000 miles.

(5) We have not found the filters in the drip plugs blocking with dirt. If this occurred we should suspect a lot of dirt in the pipe.

We have improved our brazing-work on copper pipes a great deal in the last year and have avoided a lot of dirt in pipes, defective joints, leaking nipples, etc.

(6) Oil. We have an everlasting fight with Bijur on the subject of oil. We are now using and recommending Mobiloil A winter and summer, which we used on our first experiments. Bijur recommends and supplies oils with about three times the viscosity of Mobiloil A, but we find that in real zero weather these do not flow freely enough at the cold and distant points especially the front axle. Also when the pump is pulled on a cold morning with heavy oil, the oil will not flow into it out of the tank and one has to hold it out for about a minute before the charge enters. On the cold handle this is a painful operation, and most people will not do it.

With plain front shackle pins an oil heavier than Mobiloil A may be desirable in very hot weather to prevent the oil dripping out, but we have not found any trouble with it.

(7) If a dirty oil or an oil containing fats is used, the filter in the main tank clogs after a few thousand miles and one has a warning as the pump will not fill and flies back.

Cleaning the filter is described in the instruction book sheets attached. (These sheets were drawn up by Bijur.) As far as we know no one has had to clean a filter in two years of experience.

You will doubtless use the more modern tank with the felt filter on the outlet side of the pump. In this case the clogged filter will hold the pump handle out, and the filter can readily be removed and cleaned.

We have no experience of dirt passing through this filter into the line.

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