817427 50 Mercury SCREW, (M8 x 50)

Engine Specifications
The front end of the engine is opposite the flywheel end of the engine. The left and the right sides of the engine are determined from the flywheel end. The number 1 cylinder is the front cylinder.
Illustration 1 g01187485
(A) Exhaust valves
(B) Inlet valves
Table 1
C4.4 Engine Specifications
Operating Range (rpm) 800 to 2200 (1)
Number of Cylinders 4 In-Line
Bore 105 mm (4.13 inch)
Stroke 127 mm (4.99 inch)
Power Single turbocharger charge cooled
60 to 110 kW (80.46 to 147.51 hp)
Series turbochargers charge cooled
105 to 129.5 kW (140.80 to 173.65 hp)
Aspiration Single Turbocharged charge cooled
Series turbochargers charge cooled
Compression Ratio 16.5:1
Displacement 4.4 L (268.504 cubic inch)
Firing Order 1-3-4-2
Rotation (flywheel end) Counterclockwise
(1) The operating rpm is dependent on the engine rating, the application, and the configuration of the throttle.Electronic Engine Features
The engine 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
Control of the injection pressure
Cold start strategy
Automatic air/fuel ratio control
Torque rise shaping
Injection timing control
System diagnostics
Low temperature regenerationFor more information on electronic engine features, refer to the Operation and Maintenance Manual, "Features and Controls" topic (Operation Section).Engine Diagnostics
The engine has built-in diagnostics in order to ensure that the engine systems are functioning correctly. The operator will be alerted to the condition by a "Stop or Warning" lamp. Under certain conditions, the engine horsepower and the vehicle speed may be limited. The electronic service tool may be used to display the diagnostic codes.There are three types of diagnostic codes: active, logged and event.Most of the diagnostic codes are logged and stored in the ECM. For additional information, refer to the Operation and Maintenance Manual, "Engine Diagnostics" topic (Operation Section).The ECM provides an electronic governor that controls the injector output in order to maintain the desired engine rpm.Engine Cooling and Lubrication
The cooling system and lubrication system consists of the following components:
Gear-driven centrifugal water pump
Water temperature regulator which regulates the engine coolant temperature
Gear-driven rotor type oil pump
Oil coolerThe engine lubricating oil is supplied by a rotor type oil pump. The engine lubricating oil is cooled and the engine lubricating oil is filtered. The bypass valve can provide unrestricted flow of lubrication oil to the engine if the oil filter element should become plugged.Engine efficiency, efficiency of emission controls, and engine performance depend on adherence to proper operation and maintenance recommendations. Engine performance and efficiency also depend on the use of recommended fuels, lubrication oils, and coolants. Refer to this Operation and Maintenance Manual, "Maintenance Interval Schedule" for more information on maintenance items.Aftertreatment System
The aftertreatment system is approved for use by Caterpillar. In order to be emission-compliant only the approved Caterpillar aftertreatment system must be used on a Caterpillar engine.Clean Emission Module (CEM)
The CEM comprises of two main components in a single unit, the Diesel Oxidation Catalyst DOC and the Diesel Particulate Filter DPF. The function of the CEM is to ensure that the engine exhaust meets the required emissions regulation for the country of operation.The engine exhaust is connected by a flexible pipe to the CEM. The exhaust gases pass through the DOC in order to remove contaminants, carbon monoxide, and hydrocarbons. The exhaust gases then enter the DPF where any particulate matter soot and ash will be trapped. The CEM uses a passive regeneration process to ensure that normal operation of the engine removes the soot. The soot is removed at an equal rate of which the soot is captured. The ash remains in the DPF and must be removed at an engine overhaul.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 generally predicted by the average power that is demanded. The average power that is demanded is based on fuel consumption of the engine over a period of 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.Aftermarket Products and Caterpillar Engines
Caterpillar does not warrant the quality or performance of non-Caterpillar fluids and filters.When auxiliary devices, accessories, or consumables (filters, additives, catalysts, ) which are made by other manufacturers are used on Caterpillar products, the Caterpillar warranty is not affected simply because of such use.However, failures that result from the installation or use of other manufacturers devices, accessories, or consumables are NOT Caterpillar defects. Therefore, the defects are NOT covered under the Caterpillar warranty.