TM 5-2420-230-24-2
B3.9 and B5.9 Series Engines
Engine Testing (In Chassis) (014-008)
Section 14 - Engine Testing - Group 14
Page 14-25
CAUTION
If the lubricating oil pressure is not within specifica-
tions, shut off the engine immediately. Low lubricating
oil pressure will cause engine damage. Correct the prob-
lem if lubricating oil pressure is not within specifica-
tions.
Engine lubricating oil pressure must be at least 69 kPa [10
psi] at approximately 700 rpm.
NOTE: The horsepower readings will not be accurate if the
lubricating oil temperature and fuel temperature are not
within specifications.
Make sure the engine is at operating temperature.
Move the throttle lever to the FULL-OPEN position. Adjust
the dynamometer load until the engine maintains the rated
rpm.
Allow the readings to stabilize. Read the horsepower.
Check all gauges, and record the readings.
Lubricating Oil Temperature
90 C
[194 F]
Fuel Temperature
32 C
[90 F]
CAUTION
Do not shut off the engine immediately after it has been
loaded. It must be allowed to cool sufficiently. Failure
to do so will result in engine damage.
NOTE: Idle periods longer than 5 minutes are to be avoided.
Remove the dynamometer load completely, and operate
the engine at idle speed for 3 to 5 minutes. This will allow
the turbocharger and other components to cool.
Shut off the engine after the cooldown period.
L-1323