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oil pressure sensor high
Reasons for high oil pressure: first, the viscosity of the oil is too low; second, the oil filter or oil filter element is blocked; third, the spring force of the pressure limiting valve and the oil return valve is weakened or broken, or the valve joint surface is not tightly sealed, resulting in leakage Oil pressure relief; Fourth, the main bearing or connecting rod bearing clearance is too large; Fifth, the oil pump is not easy to use.
The oil pressure sensor is usually installed in the main oil circuit. If the oil pressure gauge and oil pressure sensor are normal, the oil pressure gauge indicates that the pressure is too low, and the possible cause of the failure can be analyzed according to the composition of the lubrication system and oil circuit. If the oil circuit is divided into front and rear parts by the oil pressure sensor according to the direction of oil flow, the reasons for the low oil pressure can be divided into two aspects: one is that the oil circuit before the oil pressure sensor is not smooth (such as the filter is blocked) or the oil supply Insufficient (such as insufficient oil); second, the oil circuit behind the oil pressure sensor drains oil too fast (such as the crankshaft bearing clearance is too large). It can be roughly divided into the following reasons:
(1) The oil pressure gauge is faulty or the oil passage to the oil pressure gauge is blocked. Loosen the nuts or bolts connecting the oil pipe to the oil pressure gauge (the other end is connected to the main oil passage), respectively. If the oil pressure is high, the pressure gauge is faulty or the oil line to the oil pressure gauge is blocked.
(2) The amount of oil is insufficient, the oil has deteriorated, or there is water in the oil. Regularly check the scale of the oil dipstick in the oil pan, and add enough oil as required; check the cooperation between the piston ring and the cylinder liner, and repair it when the wear is serious.
(3) The oil brand is wrong, the viscosity is small, and the oil is too thin. Change the oil with new oil that meets specifications.
(4) The diesel engine is overloaded for a long time, which makes the oil temperature too high and too thin. Reduce diesel engine load and do not allow long-term overload work.
(5) The oil filter is blocked, the oil intake is reduced, and the pressure is too low. Clean the oil filter.
(6) Oil pollution, deterioration due to long use time, etc. , may block the filter screen or oil passage of the suction pan. Change the oil with new oil and clean the filter and oil passages.
(7) After the oil pump is worn, the internal leakage of the oil pump will increase, the oil volume in the pump will decrease, or the oil pump paper pad will be damaged and oil leakage will occur. This can be compensated by reducing the thickness of the oil pump end cover gasket. If the pump oil is still insufficient, repair or replace worn parts and damaged gaskets.
(8) Check whether the spring of the pressure limiting valve is too soft and the valve is too worn. If the valve is properly worn, check for insufficient spring elasticity.
(9) The oil circuit from the oil suction plate to the oil pump is not tightly assembled, and there is air leakage, such as the hollow bolt of the oil suction pipe is not tightened tightly. Reinstall to eliminate air leaks.
(10) The main bearing, connecting rod bearing, camshaft, bushing and other lubricating parts are worn, the clearance increases, and the lubricating oil leaks too much. And repair and replace new parts, restore the matching relationship of spare parts, so that the gap is within the normal range.
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