After the engine starts, if using a water
RUN-IN PROCEDURE. The procedure
brake type dynamometer, allow sufficient
outlined below will follow the order of the
sample Engine Test Report.
water, by means of the control loading
valves, into the dynamometer absorption
1. Pre-Starting
unit to show a reading of approximately 5
lb-ft on the torque gage (or 10-15 HP on
A. Fill the lubrication system as outlined
on some units, to lubricate the absorp-
under "Lubrication System" on page
tion unit seals and to protect them from
11H-12.
damage.
B. Prime the fuel system as outlined un-
Set the engine throttle at idle speed,
check all connections to be sure there
C. A preliminary valve clearance adjust-
a r e no leaks.
ment must be made before the engine
is started. See "Valve Clearance Ad-
Refer to the Engine Test Report sample
justment (Cold Engine) on page
which establishes the sequence of events
11H-2
for the test and Run-In, and to the Bas-
ic Engine Run-In Schedule which indi-
D. A preliminary injector timing check
cates the speed (rpm), length of time
must be made before starting the en-
gine. See "Fuel Injector Timing" on
each phase of the test. Also refer to the
Operating Conditions in the rear of Sub-
section 11A, which presents the engine
E. Preliminary governor and injector
operating characteristics. These charac-
r a c k adjustments must be made as out-
teristics will be a guide for tracing
lined in "Variable Speed Mechanical
faulty operation or lack or power.
Governor And Injector Rack Control
A d j u s t m e n t " on page 11H-4.
If the engine is to be run at speeds in
excess of 1800 rpm it must be equipped
NOTE
with a vibration damper.
Prior to starting a turbocharged
Engine governors in most cases must be
engine, remove the oil supply line
r e s e t at the maximum full-load speed des-
at the turbocharger and add clean
ignated for the Run-In. If a governor is
engine oil to the oil inlet to ensure
encountered which cannot be adjusted to
pre-lubrication of the turbocharg-
this speed, a stock governor should be
er. Reconnect the oil line and idle
installed for the Run-In.
the engine for at least one minute
after starting and before increas-
After checking the engine performance at
ing the speed.
idle speed and being certain the engine
and dynamometer are operating
2 . Basic Engine Run- In
properly, increase the engine speed to
half speed and apply the load indicated
on the Basic Engine Run-In Schedule.
The operator should be observant at all
times so that any malfunction which may
The engine should be run at this speed
develop will be detected. Since the en-
and load for 10 minutes to allow suffi-
gine has just been reconditioned, this
cient time for the coolant temperature to
Run-In will be a test of the workmanship
reach the normal operating range. Re-
of the serviceman who performed the ov-
cord length of time, speed, brake horse-
erhaul. Minor difficulties should be
power, coolant temperature and
detected and corrected so that a major
problem will not develop.
Test Report.
After performing the preliminary steps,
Run the engine at each speed and rating
for the length of time indicated in the
etc. are open. Also inspect the exhaust
Basic Engine Run-In Schedule. This is
system, being sure that it is properly
the Basic Run-In. During this time, en-
connected to the engine. Always start
gine performance will improve as new
the engine with minimum dynamometer
parts begin to "seat in" Record all of
the required data.
11H-10
