2. Operation and maintenance
13
Break-in period of the engine
General Information
Doosan engines are subjected to a final approval test to
ensure the provision of high quality engines before being
shipped. However, engines are not operated for a long
period of time in this test. Therefore, new engines require a
break-in period of during the initial 50 hours after delivery. By
properly breaking-in an engine, the highest levels of engine
performance can be maintained long-term.
Break-in Period of a New Engine
If the engine's bearings are not properly broken in, they may
be easily damaged and the lifetime of the engine may be
shortened by overloading or high speeds. In order to prevent
this, please follow the guidelines below for the initial 50 hours
after delivery of new engine.
1. Fully warm up the engine until the engine temperature
reaches the normal operation condition, before starting
operation of the engine.
2. Do not overload the engine or operate it at too high RPM.
3. Do not operate the engine with high speed at idle.
4. Do not rapidly start up or stop the engine.
5. Operate the engine with less than 70 % of the engine
load.
6. Inspection, check, and repair of engines should be
managed by officially-certified technicians at certified
service centers in compliance with corresponding rules.
Check Points
check the following during the break-in period of a new
engine.
1. Periodically check if the engine oil level is between the
minimum and maximum limit of the oil level gauge.
2. If the oil indicator lamp on the apparatus is turned on or
blinks, the oil pressure may be insufficient. In this case,
check the oil level and replenish oil if required. When
replenishing engine oil, do not exceed the maximum on
the oil level gauge. If the oil level is normal, check other
related parts such as the oil pressure sensor, oil pump, or
oil line.
3. Check the coolant level to check if the coolant circulates
properly. If the coolant in the radiator is not enough, the
coolant level indicated may not be accurate.
4. Exchange engine oil and oil filter after the break-in
period.
Cold Start Operation
Slowly warm up the engine in case of starting up in cold
weather or in areas with cold climate. Do not rapidly raise the
rpm or load before the engine has not been warmed up. The
engine may consume oil until its piston ring is in position.
Please check the engine oil level frequently for the initial 50
hours of the break-in period.
Inspection after Starting the Engine
Check the pressure of the engine lubrication system by using
the engine oil pressure gauge mounted on the apparatus
while the engine is in operation. If pressure decreases on oil
pressure gauge, immediately stop the engine. In addition,
make sure that the recharge alarm indicator lamp of the alter-
nator is turned off while the engine is operating.
1. Tightly connect the +/- terminals to prevent gaps between
them. The sheath of battery connection cables should not
be damaged or broken.
2. If the recharge alarm indicator lamp suddenly turns on or
blinks during engine operation and the engine stops, fix
the fault of the electric apparatus.
If you cannot accurately check the oil level through the
oil level gauge, rotate the oil level gauge to 180 degree,
put it in the guide tube, and then pick it out again to
check.
The oil pressure may increase with high rpm and
decrease with low rpm. In addition, the pressure of cold
oil may be higher at a specific rpm than that of warm oil.
This phenomenon may occur when the engine operates
properly.
If engine oil and oil filter need to be replaced, use only
genuine engine oil and parts recommended by Doosan.
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