REPAIR INSTRUCTIONS, PART 3
Page 297
Engine Operational Check
1. Remove all tools from the engine
compartment.
2. Connect the battery cables (negative cable
last).
3. Clear the work area of debris and personnel.
The following step is important to proper break-in
for all new parts at initial startup of the engine.
4. Start the engine and immediately increase
the speed to 1200–1600 rpm. During the
break-in period, check for leaks and monitor
gauges for satisfactory oil pressure, etc.
5. Operate the engine within the
1200–1600 rpm range for 15 minutes.
Do NOT allow the engine to drop to idle speed
until the 15 minute break-in period at
1200–1600 rpm has been completed.
6. Shut down the engine.
7. Check the fluid levels and fill to capacity
before restarting the engine.
8. Refer to Rebuilt Engine Run-In Procedures
for inspections to be sure of proper engine
operation before releasing the vehicle for
service.
REBUILT ENGINE RUN-IN
PROCEDURES
General
The durability and service life of a rebuilt engine
is directly related to its initial run-in following
overhaul. After a complete overhaul or any major
repair job involving installation of piston rings,
pistons, cylinder liners or bearings, the engine
must be run-in prior to release for service.
Run-in procedures vary depending on method
used (i.e., engine dynamometer, chassis
dynamometer or highway run-in). Regardless of
method, however, always prepare the engine
properly before starting it for the first time.
Run-In Check
Install any additional instrumentation needed for
the run-in method selected.
The operator should be familiar with the correct,
established procedure for checking chassis
power before using the chassis dynamometer
method for run-in. Refer to applicable chassis
dynamometer operating procedures.
The operator must be observant throughout the
entire run-in procedure in order to detect any
problems.
Constantly monitor the instrument display of
engine functions and support systems and record
all readings.
If the engine develops any of the following
abnormal characteristics during run-in, shut it
down immediately.
Discover and correct problems before continuing
the run-in procedure.
Always investigate the following conditions:
앫 Unusual noises, such as knocking, scraping,
etc.
앫 A significant drop in engine oil pressure
앫 A significant rise in coolant temperature,
exceeding 116°C (240°F)
앫 A significant rise in oil temperature that
exceeds 116°C (240°F)
앫 An exhaust temperature that exceeds
maximum acceptable limits for the engine
involved, as measured by a pyrometer (if
applicable)
앫 Any oil, coolant, fuel or air inlet system leaks
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