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).
Technical description and operational guide for a general oil filter, including a cross-section diagram.
Identifier | ExFiles\Box 135\3\ scan0206 | |
Date | 4th January 1938 guessed | |
1139 DIAGRAM LABELS: WRENCH SLOT FINGER RING SPRING GASKET OIL OUT FELT OIL PASSES THROUGH PERFORATED HOLES OIL IN. GASKET SCREEN CARTRIDGE MOUNTING BRACKETS FELT SCREEN PERFORATED HOLES OIL ESCAPES THROUGH FINE COTTON LINTERS MILLIARD CELL COTTON WASTE MOLDED CHARCOAL CONE MAIN TEXT: DESCRIPTION AND OPERATION OF THE GENERAL FILTER. The above drawing shows a cross section of the General filters internal combustion engine oil filter. The outside case consists of a tank and cover with oil inlet and outlet studs and brackets mounted thereon. This tank houses the filter cartridge. The cartridge is packed with Milliard Cell and acts as the filter medium. The oil entering the filter at the bottom through the metered orifice passes through the perforated holes in the bottom of the cartridge up through the Milliard Cell and then out through the perforated holes at the top of the cartridge and back into the crankcase of the engine. When the cartridge becomes filled with impurities or if the engine is started when the oil is cold, the cold oil and dirt and the cartridge restricts the flow of oil. The oil pump will build up high presures. When this occurs the cartridge is protected in that the pressure will lift the cartridge off the gasket seat and the oil will bypass out through the oil outlet back into the engine's crank-case. As the motor warms the oil, the bypassing of the oil will gradually warm the cartridge. The cold oil restriction is then eliminated through the Milliard Cell and the cartridge will gradually settle back on the gasket seat preventing further bypassing of the oil. The flat spring shown in the drawing holds the cartridge down against the seat, therefore, giving a floating action of the cartridge without the danger of cartridge collapse. However, if the cartridge is filled with dirt the oil will continue to bypass until replaced with a new one. To change the cartridge, a flat piece of metal about 12 inches long can be placed in the wrench slot of the cover and a sixth of a turn to the left will remove it so that it will expose the cartridge which can be lifted out with the finger ring and then discarded. The bowl of the filter can then be wiped out with a clean rag being careful not to distroy the gasket in the bottom. In stall the new cartridge and replace the cover by pressing down on it until all the lugs are in the slots, then turn the lid{A. J. Lidsey} to the right with the wrench until it is tight. The filter is then again ready for operation. | ||