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Adjustments and Benchtesting
Bench testing
An overhauled engine should be performance tested
on a dynamometer. This test is also for breaking in
the major running parts of the engine. To test the en-
gine, follow these procedures:
Start Up
1. Check levels in radiator, oil pan, and fuel tank.
Prime the fuel and cooling systems.
2. Crank the engine for about 10 seconds to permit
lubricating oil to circulate through the engine.
NOTE! Do not supply fuel to the engine, place the
stop lever in stop position.
3. Move the speed control lever slightly in the direc-
tion of increasing fuel injection, turn the starter
switch to START to start the engine. Do not move
the control lever to "full fuel injection" position.
4. After the engine starts, let it idle under no load by
operating the speed control lover.
Inspection after Start Up
After starting up the engine, check the following
points. If you find anything wrong, immediately stop
the engine and investigate the cause.
1. Lubricating oil pressure should be 0.49 to 0.64
Mpa (5 to 6.5 kgf/cm2) [71 to 92 psi] at rated
speed or over 0.20 to 0.29 Mpa (2 to 3 kgf/cm2)
[28 to 43 psi] at idling speed.
2. Coolant temperature should be 71 to 85°C [165
top 185°F].
3. Check for leakage of oil, coolant, fuel, especially
oil pipe connections for turbocharger lubrication.
4. Knocking should die away as coolant tempera-
ture rises. No other defective noise should be
heard.
5. Check exhaust color and for abnormal odors.
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Bench test (dynamometer) conditions
Summary table of bench testing conditions.
Step 1
Speed (rpm) .............. Idling
Load .......................... No load
Time (min.) ................ 5
Step 2
Speed (rpm) .............. 1000
Load .......................... No load
Time (min.) ................ 5
Step 3
Speed (rpm) .............. 1200
Load .......................... No load
Time (min.) ................ 10
Step 4
Speed (rpm) .............. Rated*
Load .......................... 25%
Time (min.) ................ 10
Step 5
Speed (rpm) .............. Rated*
Load .......................... 50%
Time (min.) ................ 10
Step 6
Speed (rpm) .............. Rated*
Load .......................... 75%
Time (min.) ................ 30
Step 7
Speed (rpm) .............. Rated*
Load .......................... 100%
Time (min.) ................ 20
*Rated speed: Varies according to specifications.
After Bench Testing
1. Adjust valve clearance
2. Adjust injection timing
3. Re-tighten external bolts and nuts
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