The F-engine lubrication system looks the same as the C-engine shown in this picture
1 - valve lever axis; 2 - camshaft; 3 - crankshaft; 4 - oil filter; 5 - oil pump with oil intake pipe.
In the engine, oil is necessary for the lubrication of components, bearings and rubbing surfaces. Oil is supplied to these places under pressure. To do this, the oil pump sucks oil through a reinforced oil intake pipe and directs it to the oil filter. If the filter is dirty or has not been replaced in a timely manner, the safety valve starts to work. When it is opened, the filter is excluded from the oil flow pattern. Unfiltered oil greatly increases bearing wear. From the filter, the oil flows through the main oil line, where the oil pressure sensor is installed, and then through the channels in the engine housing to the lubrication points of the crankshaft and camshaft. From the crankshaft, oil is supplied to the individual connecting rod bearings. Then the lubricant enters the oil pan through the oil channels and is again taken from there by the oil pump.
Oil pump
At full throttle opening, up to 30 liters of oil per minute passes through the engine lubrication system. The oil pump drive is arranged differently depending on the type of engine:
- on C-engine (1.4 l) The oil pump is driven by a drive shaft running directly from the camshaft.
- on F-engine (1.7-/1.8 L 16-valve and diesel) The oil pump is driven by the countershaft timing belt. Both on the C-engine and on the F-engine, the oil pump with oil pick-up pipe is located in the oil sump.
- Renault 19 has a gear-type oil pump, in which two identical gears of engagement during rotation pump oil from the oil pan to the lubrication points.
Oil temperature
Oil temperature is essential for efficient engine operation. True, the oil temperature sensor was serially installed only on the 16-valve Renault 19. According to the temperature sensor, you can monitor the change in the thermal regime of the engine. The oil temperature is usually measured in the oil filter flange or in the oil pan. In these places, the oil temperature is the lowest. In piston rings, for example, oil temperatures can reach up to 300°C. Too low temperatures are more dangerous than high temperatures. At temperatures below 60°C, the oil loses some of its properties, which leads to increased engine wear. Therefore, immediately after starting a cold engine, do not give it more than 3500 rpm, at least until the oil reaches a temperature of 60°C. In the absence of an oil temperature sensor, you can use the coolant temperature gauge. It should be remembered that the oil takes 2 times longer to reach operating temperature than the coolant. Thus, the oil will reach a temperature of about 60°C only after the coolant has completely warmed up.
Oil pressure
At t ~80°C multicomponent oil of viscosity SEET 10 W-30 will have the following characteristics:
Engine Short designation | 1.4 l C3J | 1.7-/1.8 L / 16-valve diesel F3P/F7P/F8Q |
Oil pressure at 750 rpm, bar At 1000 rpm, bar At 3000 rpm, bar At 4000 rpm, bar | 0,7 — — 3,5 | — 2,0 3,5 — |
Since only the 16-valve Renault 19 is equipped with a tachometer, you can check the pressure values given in the table on other modifications only after installing an oil pressure gauge. If the oil pressure falls below the minimum indicated in the table, the oil pressure warning lamp lights up. If the pressure is too high, due to cold and very viscous oil, the safety valve opens the bypass (bypass channel for oil), as a result of which the oil, after passing through the oil pump, returns to the oil intake pipe.
If you want to measure the oil pressure in your engine, then unscrew the oil pressure sensor and install a pressure gauge in its place.
Note. Recommendation: After a fast drive, the idling oil pressure may drop below the values given in the table for a short time. This is due to the fact that the oil becomes too hot and at the same time very liquid. This may cause the oil pressure warning lamp to flash. When you press the gas pedal, the oil pressure increases, and the control lamp goes out.