Mitsubishi S4S Service Manual page 51

2. Bench Testing
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.
To test the engine, follow the procedures described
below:
2.1 Starting Up
(l) Inspeet 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. Por this cranking, do not supply fuel to
the engine, placing the stop lever in stop position.
(3) Move the speed control lever slightly in the
direction of increasing fuel injection, and turn
the starter switch to START to start the engine.
Do not move the con trol lever to the "full fuel
injection" position.
(4) After the engine starts, let it idle under no load
by operating the speed control lever.
2.2 Inspeetion After Starting Up
After starting up the engine, check the foIlowing
points. Ifyou find anything wrong, immediately stop
the engine, then investigate the cause.
(1) Lubricating oil pressure should be 0.3 to 0.5 MPa
(3 to 5 kgf/cm") [43 to 71 psi] at rated speed or
0.1 MPa (l kgf/cm") [14.2 psi] at idling speed.
(2) Coolant temperature should be 75 to 85°C [167
to 185°P].
(3) Lube oil temperature should be 60°C to 95°C
[l40oP to 203 "F], (Varies according to engine
specifications.)
(4) Check for leakage of oil, coolant, fuel, especiaIly
oil leakage from oil pipe connections for
turbocharger lubrication.
(5) Knocking should die away as coolant temperature
rises. No other defective noise should be heard.
(6) Check for exhaust color and abnormal odors.
ADJUSTMENTS, BENCH TEST, PERFORMANCE TESTS
2.3 Bench Testlng (Dynamometer)
Conditions
Step
Speed (min-I)
Load (PS) Time (min.)
1 1000
No-load
30
2 1500
25%
30
3 25%
10
-
(According to
4
engine specifi-
50%
10
-
5 cation) 75% 30
-
6
100%
20
2.4 Inspeetion and Adjustments After
Bench Testing
(a) Adjusting valve clearance
(b) Adjusting injection timing
(c) Re-tightening external bolts and nuts
5-11