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techtalk:ref:oil04 [2022/07/30 04:56] hippysmack [Oil Tank Pressure] |
techtalk:ref:oil04 [2022/08/13 20:57] hippysmack [Mapping Oil Pressure] |
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| * When stopped at end of ride, it stayed at zero on idle. | * When stopped at end of ride, it stayed at zero on idle. | ||
| * Will see if the same thing happens at the weekend. | * Will see if the same thing happens at the weekend. | ||
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| + | ====== Mapping Oil Pressure ====== | ||
| + | When a problem is suspected, it helps to have a reference graph against which to compare the results. ((https://www.machinerylubrication.com/Read/1772/oil-pressure-bearing-wear)) \\ | ||
| + | It is, therefore, advisable to map an engine shortly after it has been run in, and then use this baseline for comparison with later graphs. \\ | ||
| + | Any change or drop-off in the graphs should be investigated. \\ | ||
| + | First, check the pump (and pressure-relief valve if applicable). \\ | ||
| + | If no fault is found with the pump, the engine itself should be inspected for excessive leakage. \\ | ||
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| + | - Make sure the engine has reached full operating temperature. \\ If possible, record the oil temperature when the pressure readings are taken. \\ The oil temperature is important because the oil thins rapidly as the oil temperature increases, and thickens again when it cools down. \\ The thickness of the oil (viscosity) affects the pressures obtained and may give inaccurately high readings if measured at too low of a temperature. | ||
| + | - Connect an oil pressure gauge in place of the oil sending unit. | ||
| + | - Connect a tachometer if required. | ||
| + | - Measure oil pressure at 10 or more engine speed intervals equally spaced between idle and maximum engine speed. | ||
| + | - Record the readings. \\ It is helpful to record the readings on graph paper and then draw a straight line from the first (idle) reading to the last reading taken at max engine speed. \\ All the intermediate points on the curve should lie above this line. | ||
| + | * If the pressure falls below the line or follows the line closely, there is likely a problem with the oil pump (or pressure-relief valve 0n 1986-1991 models), or excessive leakage is occurring within the engine itself. Even if the oil pressure is close to normal at full speed, it may be too low at peak torque where the bearings are subjected to maximum loading. | ||
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| ====== Oil Tank Pressure ====== | ====== Oil Tank Pressure ====== | ||
