42380 Mercury SEAL, WATER TUBE

Depending on the installation, some gauges may look different from the ones shown.
Tachometer - Indicates engine rpm. When the governor control lever is moved to the full speed position without load, the engine is running at high idle.When the engine governor control lever is at the full speed position with maximum rated load, the engine is running at the full load rpm (assuming the engine and load are matched).The high idle rpm, and the full load rpm, are stamped on the engine's Information Plate.
Engine Jacket Water Temperature - Indicates engine water temperature. The water temperature reading may vary according to load, but should never exceed the boiling temperature for the pressurized system being used. Engine jacket water temperature range is 80°C to 100°C (175°F and 210°F).
Inlet Air Temperature - Indicates inlet manifold air temperature. As the inlet air increases in temperature, the air expands, less oxygen is available in the cylinders, and less kW (horsepower) is developed. As a result, at full speed position with a full load, the engine may be overloaded. Maximum inlet manifold air temperature is 85°C (185°F).
Exhaust Stack Temperature - Indicates exhaust gas temperature. The temperature readings are taken from both the left and right banks. The two readings will vary slightly from each other. Maximum exhaust temperature is approximately 575°C (1065°F).
Engine Oil Pressure - Indicates engine oil pressure. The pressure reading will be greatest after starting a cold engine. Oil pressure will decrease as the engine warms while idling. As the engine speed is increased to full load speed, oil pressure will increase and stabilize. Minimum engine oil pressure is 275 kPa (40 psi) at rated speed.
Engine Oil Temperature - Indicates engine oil temperature. The purpose of the oil is to lubricate all moving parts inside the engine, and to cool the pistons and bearings. The oil cooler transfers the heat in the oil to the engine jacket water.If the cooling system cannot remove the necessary heat from the water, the engine oil cannot be properly cooled. Higher than normal oil temperature indicates a heat problem has occurred in the lubrication and/or cooling system, and a problem can occur with cylinder heads, liners, pistons or bearings. Maximum oil temperature is 110°C (230°F).
Oil Filter Differential Pressure - Indicates the difference of oil pressure between the inlet side (dirty side) and the outlet side (clean side) of the oil filter. As the element becomes plugged, the difference in pressure between the two sides of the element will increase. Maximum oil filter differential pressure is 105 kPa (15 psi).
Fuel Pressure - Indicates pressure of the filtered fuel. Minimum fuel pressure is 275 kPa (40 psi) at rated speed.
Fuel Filter Differential Pressure - Indicates the difference of fuel pressure between the inlet side and the outlet side of the fuel filter elements. As the element becomes plugged, the difference in pressure between the two sides of the element will increase. Maximum fuel filter differential pressure is 105 kPa (15 psi).
Marine Transmission Oil Temperature - Indicates marine transmission oil temperature. The marine transmission oil temperature depends upon the temperature and the quantity of water pumped through the marine transmission oil cooler.
Marine Transmission Oil Pressure - Indicates marine transmission oil pressure. The oil pressure depends on the temperature and quantity of oil pumped through the oil system. If the marine transmission oil is hot, the pressure will be less than if the oil is cold.If the oil strainer is plugged, or if there is a restriction in either the oil pump, selector valve, or lines, the pressure will be less than the minimum pressure required. Low oil pressure will result in excessive marine transmission clutch wear. If this occurs, the oil temperature will increase and oil pressure will decrease.