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 14-19
To evaluate the engine's performance correctly, this addi-
tional measurement must be observed during engine run-in
phases.
It is good practice to observe these measurements even if
engine performance meets specifications. If engine per-
formance does not meet specifications, these measure-
ments can indicate possible reasons for nonperformance.
CAUTION
Do not crank the engine for more than 30 seconds.
Excessive heat will damage the starting motor.
Crank the engine and observe the lubricating oil pressure
when the engine starts. If the engine fails to start within 30
seconds, allow the starting motor to cool for 2 minutes
before cranking the engine again.
CAUTION
If the lubricating oil pressure is not within specifica-
tions, shut off the engine immediately. Low lubricating
oil pressure will cause severe engine damage.
Engine lubricating oil pressure must be at least 69 kPa [10
psi] at 700 rpm.
Correct the problem if the lubricating oil pressure is not
within specifications.
L-1317
