0394186 JOHNSON FUEL TANK ASSEMBLY

Work carefully around an engine that is running. Engine parts that are hot, or parts that are moving, can cause personal injury.
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat products.Dispose of all fluids according to local regulations and mandates.
Table 1
Tools Needed    
Part Number     Part Name     Quantity    
1U-5470     Engine Pressure Group     1    
Illustration 1 g00296486
1U-5470 Engine Pressure Group The 1U-5470 Engine Pressure Group measures the oil pressure in the system. This engine tool group can read the oil pressure inside the oil manifold.Note: Refer to Special Instruction, SEHS8907, "Using the 1U-5470 Engine Pressure Group " for more information on the use of the 1U-5470 Engine Pressure Group .Note: The engine oil pressure can also be measured by the use of an electronic service tool. Refer to Troubleshooting for information on the use of the electronic technician.
Illustration 2 g01098032
(1) Pressure test location
Install the 1U-5470 Engine Pressure Group into oil gallery plug (1) .
Start the engine. Run the engine with SAE 10W30 or SAE 15W40 oil. The information in the engine oil pressure graph is invalid for other oil viscosities. Refer to Operation and Maintenance Manual, "Engine Oil" for the recommendations of engine oil.Note: Allow the engine to reach operating temperature before you perform the pressure test.Note: The engine oil temperature should not exceed 115 °C (239 °F).
Record the value of the engine oil pressure when the engine has reached operating temperature.
Locate the point that intersects the lines for the engine rpm and for the oil pressure on the engine oil pressure graph.
Illustration 3 g00290693
Engine Oil Pressure Graph (X) Engine RPM (Y) Engine oil pressure in kPa (1) Sufficient pressure (2) Insufficient pressure
Refer to the following for information on troubleshooting a low oil pressure condition.Low Oil Pressure
The engine oil pressure sensor detects engine oil pressure for diagnostic purposes. The engine oil pressure sensor sends a signal to the Electronic Control Module (ECM). No resetting procedure is required.Low Oil Pressure Warning
The ECM monitors engine oil pressure (Y) and engine rpm (X) in order to detect an unacceptable low oil pressure condition. If the customer has specified this parameter and if this condition exists, an event is logged and a warning signal is transmitted.Note: Mechanically controlled engines can be equipped with an oil temperature gauge and with an oil pressure gauge.Very Low Oil Pressure Warning
The ECM monitors engine oil pressure (Y) and engine RPM (X) in order to detect a very low oil pressure condition that is dangerous. If the customer has specified this parameter and if this condition exists, a fault is logged and a warning signal is transmitted. If the customer has specified the "DERATE" parameter, the ECM will slow the engine to a safe operating range.Failure of the Engine Oil Pressure Sensor
If one of the following conditions exist, a failure of the engine oil pressure sensor may have occurred:
Engine oil pressure sensors output is open.
Engine oil pressure sensors output is shorted to ground.
Engine oil pressure sensors output is shorted to electrical power supply.
Measured reading of the oil pressure is out of the specification.The ECM will detect a failure of the engine oil pressure sensor. The diagnostic lamp warns the operator about the status of the engine oil pressure sensor on the clean side of the filters. The related strategies for oil pressure will be disabled. A failure of the engine oil pressure sensor will not cause a shutdown of the engine.Reasons for High Engine Oil Pressure
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat products.Dispose of all fluids according to local regulations and mandates.
Engine oil pressure will be high if the engine oil bypass valves become stuck in the closed