TM 5-2420-230-24-2
B3.9 and B5.9 Series Engines
Engine Run-in (Engine Dynamometer) (014-006)
Section 14 - Engine Testing - Group 14
Page 14-21
With the engine speed remaining at torque peak rpm, in-
crease the dynamometer load to 75 percent of torque peak
load. Operate the engine at this speed and load level for 2
minutes.
Check all gauges, and record the data.
NOTE: Do not proceed to the next step until blowby is
stable and within specification.
Move the throttle lever to its full capacity in the opened
position, and increase the dynamometer load until the en-
gine speed is at torque peak rpm. Operate the engine at
this speed and load level for 10 minutes, or until the blowby
becomes stable and within specification.
Check all gauges, and record the data.
Reduce the dynamometer load until the engine speed in-
creases to the engine's rated rpm.
Operate the engine at rated rpm for 5 minutes.
Check all gauges, and record the data.
CAUTION
Shutting off the engine immediately after operating at
full load will damage the turbocharger and internal com-
ponents. Always allow the engine to cool before shut-
ting it off.
Remove the dynamometer load completely, and operate
the engine at 700 rpm for 3 to 5 minutes. This period will
allow the turbocharger and other components to cool.
L-1319