Doosan A2300 User Manual

A Series Diesel Engine Base Engine Components 154
Crankshaft and Main Bearings
The crankshaft is a balanced, forged steel unit. Four
cylinder engines have a main bearing.
The lower bearing shells are all the same.
All of the upper bearing shells are all the same.
The two thrust bearings control the end thrust of the
crankshaft.
The upper bearings have two holes in them. The one
side hole receives oil from the main oil rifle.
One of the adjacent holes is aligned with drilling to the
camshaft journal and serves as an orifice for
lubrication flow to the journal and is used for piston
cooling.
The hole does not align perfectly with the cooling
nozzle. The hole is off-set to keep it away from the
highly loaded bearing area.
Note : Oversize service main bearings are available
for reground crankshafts.
Cylinder Block
We have discussed the cylinder block relative to cooling and lubrication in those respective systems. We have also
discussed the interfaces of some of the above power functions with the block. This discussion will cover the
remaining interfaces including the cylinder bores.

Doosan A2300 Specifications

General

Brand	Doosan
Model	A2300
Category	Engine
Language	English

Summary

Important Safety Information

General Engine Information

Engine Specifications

Provides detailed technical data for the engine model, including dimensions and capacities.

Troubleshooting Logic

Problem Isolation and Correction

Outlines a systematic procedure for identifying and correcting engine problems based on symptoms.

Engine Will Not Crank or Cranks Slowly

Guides users through diagnosing and resolving issues when the engine won't crank or cranks slowly.

Low Power

Provides a systematic approach to identifying and fixing causes of reduced engine power output.

Excessive Exhaust Smoke

Addresses causes and solutions for excessive smoke emitted from the engine's exhaust.

Coolant Temperature Above Normal

Details common causes and corrective actions for engine overheating issues.

Lubricating Oil Pressure Low

Helps diagnose and resolve problems related to insufficient engine oil pressure.

Coolant System

Fuel System

Injection Pump Timing

Details the critical procedure for setting the engine's injection pump timing.

Injectors

Describes the function and potential issues with the engine's fuel injectors.

Air System

Malfunctioning Turbocharger

Oil Consumption and Leaks

Lubricating System

Lubricating Oil Pump

Low Oil Pressure

Oil Dilution

Electrical System

Diagnosing Electrical Malfunctions Starting Motor

Alternator

Base Engine Components

Cylinder Head and Valve Train

Piston and Rod Assemblies

Crankshaft and Main Bearings

Explains the structure and function of the crankshaft and its main bearing system.

Compression Check

Outlines the procedure for performing a compression test to diagnose engine issues.

Base Engine Components Specifications

Valve Train

Camshaft

Pistons

Crankshaft

Lists standard and worn limits for crankshaft main and connecting rod journals.

Specifications

General Engine

Contains broad engine specifications, including bore, stroke, and firing order.

Fuel System

Lubricating Oil System

Cooling System

Capscrew Markings and Torque Values – Metric