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Service Manual Mitsubishi SQ-Series diesel engines
Version 08/2004
ENGLISH
BENCH TEST TESTING AND ADJUSTING
TESTING AND ADJUSTING
31 BENCH TEST
An overhauled engine should be tested for
performance on a dynamometer. This test is also for
breaking in the major running parts of the engine, follow
the procedures described below:
31.1 Starting Up
1. Inspect the levels in the radiator, oil pan and fuel
tank. Prime the fuel and cooling systems to bleed
air out.
2. Crank the engine with the starter for 15 seconds to
permit lubricating oil to circulate through the
engine. For this cranking, do not supply fuel to the
engine.
3. Move the speed control lever slightly in the
direction of increasing the injection, and turn the
starter switch to START to start the engine. Do not
move the control lever to the “full fuel injection”
positon.
4. After the engine starts, let it to idle under no load
by operating the speed control lever.
31.2 Inspection after Starting Up
After starting up the engine, check the following points.
If you find anything wrong, immediately stop the
engine, then investigate for the cause.
1. Lubricating oil pressure should be 0.2 to 0.4 MPa
(2 to 4 kgf/cm
2
) [29 to 58 psi] at rated speed or
over 0.1 MPa (1 kgf/cm
2
) [15 psi] at idling speed.
2. Coolant temperature should be 75°C to 85°C
[167°F to 185°F].
3. Lube oil temperature should be 70°C to 90°C
[158°F to 194°F].
4. Check for leakage of oil, coolant, fuel.
5. Knocking should die away as the coolant
temperature increases. No other defective noise
should be heard.
6. Check for exhaust color and abnormal odors.
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