0332590 JOHNSON SCREW, Lower bearing retainer

Engine Specifications
Table 1
C8.7 Marine Engine Specifications    
Cylinders and Arrangement     In-line 6    
Bore    
135 mm (5.3 inch)    
Stroke    
117 mm (4.7 inch)    
Compression Ratio     14.4 : 1    
Aspiration     Turbocharged and supercharged    
Displacement    
8.7 L (531.5 cubic inch)    
Firing Order     1-4-2-6-3-5    
Rotation (flywheel end)     Counterclockwise    
Control system     Electronic    
Method of fuel injection     Electronic fuel injectors
Common rail    
Maximum injection pressure    
1600 bar (23200 psi)    
Method of starting     Electronic starting motor    
Method of cooling the turbocharged and supercharged air     Sea water intercooling and aftercooling    Electronic Engine Features
Cat C8.7 Marine Engines are designed for electronic controls. The integral on board computer controls the operation of the engine. Current operating conditions are monitored. The Electronic Control Module (ECM) controls the response of the engine to these conditions and to the demands of the operator. These conditions and operator demands determine the precise control of fuel injection by the ECM. The electronic engine control system provides the following features:
Engine monitoring
Engine speed governing
Automatic air/fuel ratio control
Torque rise shaping
Injection timing and quantity control
System diagnosticsFor more information on electronic engine features, refer to the Operation and Maintenance Manual, "Engine Features and Controls" topic (Operation Section).Common Rail Fuel Injection System
The common rail fuel injection system performs the following functions:
Pressurize the fuel
Meter the fuel
Time the fuel injectionThe fuel pump pressurizes the fuel. The fuel pump pumps the fuel to the fuel rail. The common rail fuel injectors inject fuel into the cylinders at a precise time. The fuel is injected into the cylinders with the appropriate volume. Electronic sensors on the engine determine time and volume of fuel injection.Engine Diagnostics
The engine has built-in diagnostics in order to ensure that all of the components are functioning properly. In the event of a deviation from the programmed limits, the operator will be alerted to the condition by the following: "DIAGNOSTIC" lamp (OEM installed), MECP1 (optional) and displays (OEM installed). Under certain conditions, the engine horsepower and the vessel speed may be limited. A Cat electronic service tool may be used to display the diagnostic code.Diagnostic codes are logged and stored in the ECM. For additional information, refer to theTroubleshooting manual.Engine Speed Governing
The ECM provides electronic governing that controls characteristics of fuel injection in order to maintain the desired engine rpm. The functionality of electronic governor is similar to the Cat mechanical governor, but the electronic governor includes additional features.Engine Cooling and Lubrication
The cooling system consists of the following components:
Gear driven sea water pump
Intercooler and aftercooler
Engine oil cooler
Jacket water temperature regulator
Jacket water pump
Heat exchanger
Coolant expansion tank
Fuel cooler
Optional engine mounted transmission oil cooler
Optional wet (sea water) exhaust riserThe engine lubricating oil that is supplied is cooled by an engine oil cooler. The engine lubricating oil is also filtered. Bypass valves provide unrestricted flow of lubrication oil to the engine components during the following conditions:
High oil viscosity
Plugged oil cooler or plugged oil filter elements (paper cartridge)Fuel System
The fuel system consists of the following components:
ECM controlled off-engine electric priming pump
Off-engine primary fuel filter and water separator
Transfer pump
Secondary fuel filter
High pressure common rail fuel pump
Fuel rail
Electronically controlled injectors
Fuel cooler
Water-in-fuel sensor (optional)The electric priming pump primes the system with fuel after a fuel system service. The electric priming pump also primes the system with fuel if the engine has not run for an extended period.Engine Service Life
Engine efficiency and maximum utilization of engine performance depend on the adherence to proper operation and maintenance recommendations. In addition, use recommended fuels, coolants, and lubricants. Use the Operation and Maintenance Manual as a guide for required engine maintenance.Expected engine life is predicted by the average power that is demanded. The average power that is demanded is based on fuel consumption of the engine over a time. Reduced hours of operation at full throttle and/or operating at reduced throttle settings result in a lower average power demand. Reduced hours of operation will increase the length of operating time before an engine overhaul is required. For more information, refer to the Operation and Maintenance Manual, "Overhaul Considerations" topic (Maintenance Section).