RADIATOR & HYD OIL COOLER GP 1355777 - Caterpillar

HEUI Pump Troubleshooting
If the engine will not start, the following items are possible causes. Also, refer to Special Instruction, REHS1281, "Procedure for Diagnosing the HEUI Fuel System".
The drive gear is inadequately torqued in order to engage the gear and the shaft.
The Injection Actuation Pressure Control Valve (IAPCV) has malfunctioned and the IAPCV will not allow the pump to build pressure.
The HEUI pump has an internal malfunction.Instability of engine speed can be caused by erratic rail pressure.
Check the diagnostic codes on the engine in order to verify that a 164-11 Injector Actuation Pressure system fault has not occurred. A 164-11 diagnostic code indicates that the desired injection pressure and the actual injection pressure are not equal.
In order to verify the 164-11 code, complete a data log in Cat ET and record the following items: "Engine Speed", "Desired Injection Actuation Pressure", "Actual Injection Actuation Pressure" and "Injection Actuation Current". Review the data and verify that the actual injection actuation pressure is within 3 MPa (435 psi) of the desired injection actuation pressure while the engine is running.
If a 164-11 Injector Actuation Pressure system fault occurs, or if the actual injection actuation pressure varies by more than 3 MPa (435 psi), replace the IAPCV.Performing a Sea Trial
It is important to connect calibrated gauges in order to measure fuel flow when a sea trial is performed in order to diagnose low power. The "Fuel Flow" parameter in Cat ET is a calculation of fuel flow. The parameter in Cat ET is not an actual measurement. The ECM will signal the injector to deliver fuel. If the injector malfunctions, the injector may not deliver the fuel that is required. Exhaust temperatures are also very important in determining a low power complaint. An outline of a procedure for a sea trial can be found below. Also, refer to Sea Trial Guide for Marine Engines, LEBM5081.
Table 1
Required Tools    
Laptop computer with the latest version of Cat ET    
Latest available flash file for the engine that is being tested    
Communications adapter    
A 211-4988 Adapter Cable As may be required if the vessel does not have the Caterpillar data link between the two engines.    
1P-7438 Beaker    
1P-7408 Hydrometer    
238-5636 Exhaust Thermocouple (Type K Thermocouple)    
A device for monitoring the temperature that is compatible with a type K thermocouple (Fluke 87 and 6V-9129 Temperature Adapter Gp    There are three steps that must be completed on the vessel in order to conduct a thorough sea trial. The "General Information", the "Sea Trial Transient", and the "Sea Trial Steady State test" must be completed. All three functions are completed with Cat ET. These functions must be done while Cat ET is connected to the engine and while the ECM is powered. The "General Information" file contains the following information:
"Vessel name"
"Port"
"Customer name"
"Builder"
"Dealer information"
"Hull Type"
"Lengths"
"Weights"
"Capacities"
"Vessel type"
"Engine model" and "transmission model"
"Engine serial number" and "transmission serial number"
"Arrangement numbers"
"Gear ratio's"
"Engine personality module indentification"
Data that is taken before the sea trial,