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).
Page from a 1934 Buick shop manual detailing the components, operation, and maintenance of the oil temperature regulator.
| Identifier | ExFiles\Box 131\1\ scan0189 | |
| Date | 1st January 1934 | |
| Page 24 BUICK 50-60-90 SHOP MANUAL, 1934 engine parts and a consequent uniformity of heat expansion throughout the engine. The oil temperature regulator consists of three major parts: 1. A cast-iron body which bolts to the cylinder block and forms a substantial support for the complete assembly. 2. A honeycomb core of new U-flow type with two oil headers, the lower of which is provided with fittings connected to the crankcase with short pipes. 3. A removable sheet metal cover carrying the inlet elbow and forming a water jacket. direct passage of the oil to the bearings without circulation through the regulator. To shorten the period necessary to warm the oil sufficient to cause circulation through the temperature regulator, the pressure relief valve discharges the excess oil back into the pump body instead of into the oil sump. When the temperature of the engine oil is raised sufficiently to reduce its viscosity to a point where the resistance to flow in the core passages of the regulator is less than that required to hold the by-pass valve open, this valve closes and all the oil supplied by the pump passes through the core of the temperature regulator where it is still further warmed by the circulating water passing through the core. Fig. 20. Oil Temperature Regulator This design allows servicing of cores, cases and covers separately. There are no soldered joints except on the core. When mounted on the cylinder block the core is inclined at an angle, giving complete drainage of water and oil. The operation of the temperature regulator is as follows: When the engine is started cold the high viscosity of the oil builds up a resistance in the core passages of the regulator sufficient to cause the by-pass valve in the oil pump to open and permit Fig. 21. Oil Temperature Regulator Chart Diagram Labels: COLD WARMING UP HOT RELIEF VALVE OIL PUMP TO BEARINGS BY-PASS VALVE OIL PUMP SCREEN If the car is then driven at high speed for any considerable length of time the temperature regulator takes up its function as a cooler. Cleaning Oil Temperature Regulator Oil temperature regulator should be cleaned every 20,000 miles, as at this distance a sufficient quantity of sediment is deposited on the tubes as to lower the efficiency of the regulator. | ||