DETROIT DIESEL 53
Run-In Instructions 13.2.1
Schedule. This is the Basic Run-In. During this time
B. BASIC ENGINE RUN-IN
engine performance will improve as new parts begin to
The operator should be observant at alt times, so that
"seat in". Record all of the required data.
any malfunction which may develop will be detected.
C. BASIC RUN-IN INSPECTION
Since the engine has just been reconditioned, this run-in
While the engine is undergoing the Basic Run-In, check
will be a test of the workmanship of the serviceman who
each item indicated in Section "C" of the Engine Test
performed the overhaul. Minor difficulties should be
Report. Check for fuel oil or water leaks in the rocker
detected and corrected so that a major problem will not
arm compartment.
develop.
During the final portion of the Basic Run-In, the engine
After performing the preliminary steps, be sure all water
should be inspected for fuel oil, lubricating oil and water
valves, fuel valves, etc are open. Also inspect the
leaks.
exhaust system, being sure that it is properly connected
Upon completion of the Basic Run-In and Inspection,
to the engine. Always start the engine with minimum
remove the load from the dynamometer and reduce the
dynamometer resistance.
engine speed gradually to idle and then stop the engine.
After the engine starts, if using a water brake type
dynamometer, allow sufficient water, by means of the
D. INSPECTION AFTER BASIC RUN-IN
control loading valves, into the dynamometer absorption
The primary purpose of this inspection is to provide a
unit to show a reading of approximately 5 Ib-ft on the
fine engine tune-up. First, tighten the cylinder head and
torque gage (or 10-15 HP on a horsepower gage). This
rocker arm shaft bolts to the proper torque. Next,
is necessary, on some units, to lubricate the absorption
complete the applicable tune-up procedure. Refer to
unit seals and to protect them from damage.
Section 14.
Set the engine throttle at idle speed, check the
E. FINAL RUN-IN
lubricating oil pressure and check all connections to be
After all of the tests have been made and the Engine
sure there are no leaks.
Test Report is completed through Section "D", the
Refer to the Engine Test Report sample which
engine is ready for final test. This portion of the test and
establishes the sequence of events for the test and run-
run-in procedure will assure the engine owner that his
in, and to the Basic Run-In Horsepower Schedule which
engine has been rebuilt to deliver factory rated
indicates the speed (rpm), length of time and the brake
performance at the same maximum speed and load
horsepower required for each phase of the test. Also,
which will be experienced in the installation.
refer to the Operating Conditions in Section 13.2 which
If the engine has been shut-down for one hour or longer,
presents the engine operating characteristics. These
it will be necessary to have a warm-up period of 10
characteristics will be a guide for tracing faulty operation
minutes at the same speed and load used for warm-up
or lack of power.
in the Basic Run-In. If piston rings, cylinder liners or
Engine governors in most cases must be reset at the
maximum full-load speed designated for the run-in. If a
the Basic Run-In, the entire Basic Run-In must be
governor is encountered which cannot be adjusted to
repeated as though the run-in and test procedure were
this speed, a stock governor should be installed for the
started anew.
run-in.
All readings observed during the Final Run-In should fall
After checking the engine performance at idle speed
within the range specified in the Operating Conditions in
and being certain the engine and dynamometer are
Section 13., and should be taken at full load unless
operating properly, increase the engine speed to half
otherwise specified. Following is a brief discussion of
speed and apply the load indicated on the Basic Run-In
each condition to be observed.
Horsepower Schedule.
The engine water temperature should be taken during
The engine should be run at this speed and load for 10
the last portion of the Basic Run-In at full load. It should
minutes to allow sufficient time for the coolant
be recorded and should be within the specified range.
temperature to reach the normal operating range.
Record length of time, speed, brake horsepower,
coolant temperature and lubricating oil pressure on the
Engine Test Report.
Run the engine at each speed and rating for the length
of time indicated in the Basic Run-In Horsepower
1970 General Motors corp.
October, 1970
SEC. 13.2.1 Page 3
