ADJUSTMENT AND OPERATION
13-9
2. Break-in operation
After the engine is overhauled, couple the engine to the
dynamometer, and run the engine for break-in operation and
inspection.
2.1 Starting up
(1)
Before starting the engine, check the levels of coolant,
engine oil and fuel.
Bleed air from the fuel and cooling systems.
(2) Stop the fuel supply, and crank the engine with the
starter for about 10 seconds to lubricate the engine.
(3) Move the control lever slightly in the fuel increase
direction (but not to the "full injection" position), and
then turn the starter switch key to the [START] position
to start the engine.
(4) After the engine is started, adjust the control lever to let
the engine operate at a minimum no-load speed (low
idle speed).
(5) Turn the starter switch key to the [OFF] position and
make sure that the engine is stopped.
2.2 Inspecting engine condition after starting
up
During the break-in operation, check the followings.
If any abnormality is found, stop the engine, investigate the
cause, and take appropriate measures.
(1) The oil pressure must be within the specified value.
(2) The coolant temperature must be within the specified
value.
(3) The engine must be free from any leakages such as oil,
coolant and fuel. Pay special attention to oil leakage
from the fitting face of turbocharger lube oil pipe.
(4) Check for an abnormal noise.
Note: Knocking noise will disappear as the coolant
temperature rises.
(5) Check for the color of smoke and odors.
2.3 Break-in operation time
The relationship between the load in break-in operation and
the operation time is as shown below.
Note: The table above is provided solely for reference
purpose. Run the engine at appropriate speed and
load for the break-in operation of your engine. Be
sure to perform break-in operation after overhaul or
installation.
2.4 Inspection and adjustment after break-in
operation
(1)
Valve clearance adjustment
(2) Ignition timing inspection
(3) Exterior bolt and nut tightness check
Break-in operation time
Engine speed (min
-1
) Load
Duration
(min)
1
Low
rotation
speed
600 to 900 No-load 5
2
Medium
rotation
speed
1000 to 1200 No-load 5
3
High
rotation
speed
1400 to rated speed No-load 10
4
Rated speed
25 % 10
5 50 % 10
6 75 % 30
7 100 % 20
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