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... SPRITE Oil Pressure: The oil pressure gauge indicates whether the oiling system is working properly. It should be looked at occasionally while the engine is running. The engine oil pressure may rise to over 60 lbs. per sq. in. (4.2 kg./cm.2) when the engine is first started up in cold weather, but after the oil has circulated and become warm the pressure will drop to 60 lbs. per sq. in. (4.2 kg./cm.2) with a proportionately lower idling pressure. Never run the engine if the gauge fails to register a pressure or if the pressure is very low. Switch off and investigate the cause of the failure as otherwise serious damage might result. Full Flow Filter: Before reaching the engine bearings the oil is passed through a full flow filter at a controlled pressure of approximately 60 lbs. per sq. in. (4.2 kg./cm.2). Some pressure is lost in passing the oil through the filter element and this pressure loss will become more pronounced as the element becomes coated by foreign matter removed from the oil. A balance valve is provided in the filter unit to guard against the possibility of the filter becoming completely choked and thereby preventing the oil from reaching the bearings. This balance valve is set to open when there is a pressure difference between the oil on the inside and the oil on the outside of the filter element of 15 lbs. per sq. in. (1.06 ...
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