0386052 JOHNSON GEARCASE AND BRG ASSY

Illustration 1 g00665930
Typical instrument panel
Your engine may not have the same gauges or all of the gauges that are described. For more information about the gauge package, refer to the literature that is provided by the OEM of the package.
If no oil pressure is indicated, STOP the engine. The engine will be damaged from operating without oil pressure.
Engine Oil Pressure - This gauge indicates the pressure of the engine oil. This pressure will be highest after a cold engine is started. The pressure will decrease as the engine warms up. The pressure will increase when the engine rpm is increased. The pressure will stabilize when the engine rpm and temperature are stable.If the load is stabilized but the engine oil pressure fluctuates, perform the following procedure:
Remove the load.
Reduce the engine speed to low idle rpm.
Check the oil level. Maintain the oil level between the "ADD" and "FULL" marks on the "LOW IDLE" side of the oil level gauge (dipstick).
Inspect the lubrication system for leaks.
Jacket Water Temperature - This gauge indicates the temperature of the engine coolant at the outlet for the jacket water. The temperature may vary according to the load. Do not allow the temperature to exceed the boiling temperature of the pressurized cooling system.The sensor for jacket water temperature must be fully submerged in order to detect the temperature correctly. If the engine is operating above the normal temperature range, perform the following procedure:
Reduce the load and/or 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 and/or rpm.
System Voltage - This gauge indicates the amount of charge or discharge in the battery charging circuit.
Fuel Pressure - This gauge indicates fuel pressure to the fuel injection pump from the fuel filter. A decrease in fuel pressure usually indicates a dirty fuel filter or a plugged fuel filter. As the fuel filter becomes plugged, there will be a noticeable reduction in the engine's performance.
Exhaust Temperature - This gauge indicates the exhaust temperature at the exhaust inlet to the turbochargers. The two exhaust temperatures may vary slightly. This may be due to variation of the sensitivity of the two thermocouples.The exhaust temperatures at the exhaust inlets to the turbochargers provide a good indication of engine performance. For engines with dry exhaust manifolds, the temperatures are representative of the actual temperatures of the valves. Monitor this parameter frequently.Pyrometer - The pyrometer displays the temperature of the exhaust for the exhaust port of each individual cylinder and for the exhaust stacks.The exhaust port temperatures are a good indication of the condition of the cylinders. The displayed temperature is slightly lower than the actual temperature in the cylinder. This is because of the constant flow of exhaust gas past the thermocouple. For engines with dry exhaust manifolds, the exhaust port temperatures are usually lower than the temperatures at the inlets to the turbochargers.Guttering of valves can be diagnosed with the exhaust port temperature. The ability to diagnose this problem may help to prevent additional damage that could cause further downtime with a higher repair cost.During normal operation at rated load, the temperature of the hottest cylinder and the coldest cylinder may differ by 38 to 52 °C (100 to 125 °F).The exhaust stack temperature is not a suitable substitute for the exhaust temperature at the inlet to the turbocharger. However, a comparison of the two temperatures can help to assess the performance of the turbocharger.
To help prevent engine damage, never exceed the high idle rpm. An overspeed can result in serious damage to the engine. The engine can be operated at high idle without damage, but the engine should never be allowed to exceed the high idle rpm.
Tachometer - The tachometer displays the engine rpm. The high idle rpm and the rated rpm are printed on the engine Information Plate.
Hourmeter - This meter indicates the hours of engine operation.
Inlet Air Restriction (Air Cleaner Differential Pressure) - This gauge indicates the difference in air pressure between the inlet side and the engine side of the air filter element. The air cleaner differential pressure 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.
Fuel Filter Differential Pressure (Restriction) - This gauge indicates the difference in fuel pressure between the inlet side and the outlet side of the fuel filter. As the fuel filter element becomes plugged, the difference in pressure between the two sides of the fuel filter increases.
Oil Filter Differential Press