973246 Volvo.Penta Hexagon screw

Recommended Actions
Starting Aids
Air Inlet Heater
If programming the air inlet heater is an option, make sure that the air inlet heater is programmed to the On position. For additional information on the Air Inlet Heater, refer to Troubleshooting, "Air Inlet Heater Circuit - Test".Ether Injection System
Make sure that the ether injection system is programmed to the On position. For additional information on the Ether Injection System, refer to Troubleshooting, "Ether Injection System - Test".Oil Grade Plugs
Make sure that the "Oil Grade" is programmed correctly. For additional information on the Oil Grade Plugs, refer to the Operation and Maintenance Manual, "Engine Oil and Filter - Change".ECM Personality module
If a new ECM has been installed on the engine, the Engine will not start until the personality module is programmed. Also, the ECM will not communicate with the ET until the correct personality module has been flashed into the ECM.
Verify that the following diagnostic is not active.
CID 253-FMI 02, SPN 234-FMI 02, Flash 56, Personality Module mismatchIf the code is active, access the "Winflash" and flash the correct version of the software.Electrical power to ECM
Check the positive battery and negative battery connections to the ECM.
Perform a pull test on positive battery wires and negative battery wires.
Check the negative battery connection on the Ground Stud.
Turn the keyswitch OFF.
Wait for 10 seconds and turn the keyswitch ON.
The warning lamps should come on for 2 - 4 seconds.If the warning lamp comes on for 2 to 4 seconds, continue to follow this procedure.If the warning lamp does not come on for 2 to 4 seconds, refer to Troubleshooting, "Electrical Power Supply Circuit - Test".Remote shutdown switch
Access the ET screen that displays the Remote Shutdown Switch status. The Remote Shutdown Switch status on the ET is called "User Shutdown".
Table 1
"User Shutdown Status"     Switch Status     Measured Voltage at P61:27    
ON     Negative battery     <0.9 VDC    
OFF     Open Circuit     >10 VDC    If the voltage is not in the proper range, refer to Troubleshooting, "Remote Shutdown Switch Circuit - Test".Air shutoff circuit
Refer to Troubleshooting, "Air Shutoff System - Test" for additional information.Starting Motor Solenoid or Starting Circuit
Test the operation of the starting motor solenoid.
Check the engine wiring to the starting motor solenoid.
Test the operation of the starting motor.
Inspect the starter and the flywheel ring gear for damage.Engine speed/timing sensors
Observe the engine speed on the ET while the engine is being cranked.This situation may require a direct hookup to the batteries in order to power the ET while the engine is cranking. Refer to illustration 1 for the wiring diagram.
Illustration 1 g00781203
A problem exists in the circuits for the engine speed/timing sensors if the following conditions exist.
The engine is cranking.
The ET screen displays 0 rpm.Refer to Troubleshooting, "Engine Speed/Timing Sensor Circuit - Test".If an engine speed is present, check the sensor installation. If the sensor is not properly installed, the ECM may read engine speed, but the ECM cannot determine the tooth pattern. The ability for the ECM to read the tooth pattern is necessary to determine the cylinder position. Engine speed is present when engine speed is greater than 50 rpm. Refer to Troubleshooting, "Engine Speed/Timing Sensor Circuit - Test".Electrical connections to the electronic unit injector
Ensure that the electronic unit injector connector (J300/P300) is fully connected and ensure that the electronic unit injector connector (J300/P300) is free of corrosion.
Check for logged diagnostic codes that are related to the cylinder. Go to Troubleshooting, "Injector Solenoid Circuit - Test" if diagnostic codes that are related to the cylinder are present.Injection Actuation Pressure Control System
Crank the engine and monitor the injection actuation pressure. Also monitor the output of the injection actuation pressure control valve. The High Pressure Oil system is operating properly if the pressure output is a minimum of 6 MPa (870 psi).
Connect the electronic service tool and check for Event Code 164-11 Injection Actuation Pressure system fault. If an 164-11 Event Code has been logged recently, refer to Troubleshooting, "Injector Actuation Pressure System-Test".
If higher than actual pressure is being indicated, then disconnect the injection actuation pressure sensor and try to start the engine. If the engine starts, refer to Troubleshooting, "Injection Actuation Pressure Sensor-Test".Check the Fuel Supply
Check the fuel level.
Monitor the exhaust for smoke while the engine is being cranked.If no smoke is present, there may be a problem with the fuel quality or there may be a problem with the fuel supply.
Check the fuel pressure. Refer to Testing and Adjusting, "Fuel System Pressure - Test".
Ensure that the fuel system has been primed. Refer to Testing and Adjusting, "Fuel System - Prime".
Check for fuel supply lines that are restricted.
Check the fuel filters.
If the temperature is below 0 °C (32 °F), check for solidified fuel (wax).Check for Combustion Problems
Examples of combustion problems are shown in the following list:
Outside temperatures are too cold.
Mechanical problem