851526 Volvo.Penta Pressure hose, hose

If no oil pressure is indicated, STOP the engine. Engine damage can result.
Engine Oil Pressure - This gauge indicates the pressure of the engine oil. The engine oil pressure will be highest after a cold engine is started. The engine oil pressure will decrease as the engine warms up. The engine oil pressure will increase when the engine rpm is increased. The engine oil pressure will stabilize when the engine rpm is stable. The typical engine oil pressure at low idle rpm is 172 kPa (25 psi). The typical engine oil pressure above 650 rpm is 448 kPa (65 psi).
Oil Filter Differential Pressure - This gauge indicates the difference in pressure between the inlet side and the outlet side of the engine oil filters. As the oil filter elements become plugged, oil filter differential pressure will increase. Replace the engine oil filter elements when the oil filter differential pressure reaches 103 kPa (15 psi).
Engine Oil Temperature - This gauge indicates the engine oil temperature after the oil has passed through the oil cooler. The oil cooler is thermostatically controlled. The oil temperature is controlled by an 83°C (181°F) temperature regulator that is in contact with the oil. The pump for the aftercooler and the oil cooler pumps coolant for the engine oil.
Crankcase Pressure - This gauge indicates the pressure that is inside the crankcase. The typical crankcase pressure is .125 kPa (.0181 psi). Changes in the crankcase pressure may indicate problems with the following components: pistons, piston rings and cylinder liners.
Aftercooler and Oil Cooler Inlet Water Temperature - The water temperature is regulated by water temperature regulators. If the cooling system cannot remove enough heat from the water, then the engine cannot be cooled properly. An oil temperature that exceeds the normal oil temperature may indicate that a problem has occurred in the lubrication system and/or the cooling system. Those problems may involve the following components: water temperature regulators, oil coolers, cylinder heads, cylinder liners, pistons and bearings.
Jacket Water Temperature - This gauge indicates the temperature of the engine coolant at the outlet for the jacket water. The jacket water temperature may vary according to the load. The jacket water temperature should never be allowed to exceed the boiling temperature of the pressurized cooling system. The jacket water temperature is regulated to a temperature of 90°C (194°F) at the inlet for the jacket water. If the engine is operating above the normal temperature range for the jacket water and steam becomes apparent, perform the following procedure:
Reduce the load and the engine rpm.
Inspect the cooling system for leaks.
Determine if the engine must be shut down immediately or if the engine can be cooled by reducing the load.
Inlet Manifold Air Temperature - This gauge indicates the inlet manifold air temperature after the aftercooler. As the inlet air increases in temperature the following conditions occur: expansion of the air, less oxygen in the cylinders and less power developed. If the temperature of the inlet air is too high during full speed and load operation, the engine may consume excessive fuel. The typical inlet manifold air temperature is 55 to 65°C (131 to 149°F).
Inlet Manifold Air Pressure - This gauge indicates the air pressure (turbocharger boost pressure) in the air plenum (air inlet manifold) after the aftercooler. The inlet manifold air pressure depends on the engine rating, the load, and the operating conditions. To establish the normal inlet manifold air pressure, compare the data from the gauge to the data from the engine commissioning and look for trends.
Air Restriction - This gauge indicates the difference in air pressure between the inlet side and the engine side of the air filter element. The air restriction is measured from the turbocharger air inlet. As the air filter element becomes plugged, the difference in pressure between the two sides of the air cleaner element will increase. Normal air restriction is 1.25 kPa (5 inches of H2O). Replace the air cleaner element when the air restriction reaches 3.7 kPa (15 inches of H2O).
Turbocharger Exhaust Inlet Temperature - This gauge indicates the exhaust gas temperature at the turbocharger inlet. The normal operating temperature range is from 570 to 630°C (1058 to 1166°F). The maximum continuous temperature is 650°C (1202°F). Exhaust Port Temperature - This gauge indicates the temperature of the exhaust gas from each individual cylinder. The temperature is measured at the exhaust port of each cylinder head. The exhaust temperature will vary slightly between the cylinders. Individual cylinder exhaust temperatures should not vary by more than 50°C (122°F) from the average of all of the cylinder exhaust temperatures.
Tachometer - This gauge indicates the engine rpm.