3C7-84540-1 Tohatsu REMOTE CONTROL BOX KIT (RC6ET)

Engine Specifications
Note: 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 g06084550
Cylinder and valve location
(A) Exhaust valves
(B) Inlet valves
Table 1
C3.4B Engine Specifications
Operating Range (rpm) 800 to 2500(1)
Number of Cylinders 4 In-Line
Number of valves in cylinder head 8
Bore 99 mm (3.89763 inch)
Stroke 110 mm (4.33070 inch)
Power 45 kW to 55.4 kW (60.345 hp to 74.3 hp)
62 kW to 86 kW (83.142 hp to 115.326 hp)
Aspiration Turbocharged
Turbocharged charge cooled
Compression Ratio 17: 1
Displacement 3.4 L (207.48 cubic inch)
Firing Order 1-3-4-2
Rotation (flywheel end) Counterclockwise
(1) The operating rpm depends on the engine rating, the application, and the configuration of the throttle.Engine Type
There are three different types of C3.4B engines and aftertreatment.
Turbocharged engine with wall flow Diesel Particulate Filter (DPF)
Turbocharged, charge cooled with wall flow DPF
Turbocharged, charge cooled with through flow DPFThe engine is available as a variable speed engine, constant speed engine, and a constant power output engine.Aftertreatment Type
There are two different types of aftertreatment that can be installed, the wall flow DPF and the through-flow DPF. The through-flow DPF will not require a maintenance interval.The wall flow DPF will require a maintenance interval, refer to this Operation and Maintenance Manual, "Maintenance Interval Schedule" more information.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
Aftertreatment 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 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 to maintain the desired engine rpm.Engine Cooling and Lubrication
The cooling system and lubrication system consists of the following components:
Belt driven centrifugal water pump
Water temperature regulator which regulates the engine coolant temperature
Gear-driven rotor type oil pump
Multi-plate oil coolerThe engine lubricating oil is cooled and the engine lubricating oil is filtered.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.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.Aftertreatment System
The aftertreatment system is approved for use by Caterpillar. To be emission-compliant, only the approved Caterpillar aftertreatment system must be used on a Caterpillar engine.