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