3ACB01020-0 Nissan COVER, CYLINDER HEAD

Engine Oil Pressure - Typical oil pressure for an engine at rated speed with SAE 10W30 or with SAE 15W40 is 276 to 606 kPa (40 to 88 psi) for the C-15. A higher oil pressure is normal with cold oil when the engine is started. A lower oil pressure is normal at low idle. If the load is stable and the gauge reading changes, perform the following procedure:
Remove the load.
Reduce engine speed to low idle.
Check the oil level. Maintain the oil level at the proper amount.The diagnostic lamp will turn on if the oil pressure drops below 35 kPa (5 psi) at low idle rpm. The diagnostic code will be logged in the Engine Control Module (ECM).
Engine Oil Temperature - This gauge indicates the engine oil temperature. An oil temperature that is higher than normal indicates a heat problem in the lubrication system and/or the cooling system. This problem can damage the cylinder heads, the cylinder liners, the pistons, and the crankshaft bearings.
Jacket Water Coolant Temperature - Typical temperature range is 87 to 98° C (189 to 208° F). The maximum allowable temperature with the pressurized cooling system is 107° C (225° F) for the C-15. Higher temperatures may occur under certain conditions. The water temperature reading may vary according to load. The reading should never exceed the boiling point for the pressurized system that is being used. If the engine is operating above the normal range 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.
Do not exceed 2300 rpm in any situation or 2100 rpm if equipped with an auxiliary engine brake system.
Tachometer - This gauge indicates engine speed. The engine can be operated at high idle without damage, but the engine should not be allowed to overspeed. The engine can overspeed by downshifting or by going downhill. An overspeed can result in serious damage to the engine. Note: The high idle rpm and the full load rpm are stamped on the Information Plate.
Ammeter - This gauge indicates the amount of charge or the amount of discharge in the battery charging circuit. Operation of the indicator should be to the right side of "0"(zero). The charging system should be checked for a malfunction if the indicator is constantly to the left side of "0"(zero) or if the indicator shows an excessive charge during normal operation. Correct any problems.
Service Hour Meter - This gauge indicates the total amount of operating hours on the engine. Hours of operation are logged in the ECM. A service tool is needed to retrieve the hours from the ECM. A Service Hour Meter may be installed on the engine.
Inlet Manifold Air Pressure (Boost Pressure) - This gauge indicates the air pressure (turbocharger boost pressure) in the air plenum (air inlet manifold) after the aftercooler.
Fuel Level - This gauge indicates the level of fuel in the fuel tank. The fuel level gauge registers the fuel level only when the ignition switch is in the ON position.
Engine Coolant Level (If Equipped) - This indicator will warn the operator if the engine coolant level is too low.