DETROIT DIESEL 53
Run-In Instructions 13.2.1
Operating Conditions in section 13.2.
The lubricating oil temperature reading must be taken
readings on the Engine Test Report.
while the engine is operating at full load and after it has
been operating long enough for the temperature to
Check the exhaust back pressure at the exhaust
stabilize. This temperature should be recorded and
manifold companion flange or within one inch of this
should be within the specified range.
location. This check should be made with a mercury
manometer through a tube adaptor installed at the
The lubricating oil pressure should be recorded in psi
tapped hole. If the exhaust manifold does not provide a
after being taken at engine speeds indicated in the
1/8" pipe tapped hole, such a hole can be incorporated
Operating Conditions, Section 13.2.
by reworking the exhaust manifold.
The fuel oil pressure at the fuel manifold inlet passage
Install a fitting for a pressure gage or manometer in this
should be recorded and should fall within the specified
hole. Care should be exercised so that the fitting does
range. Fuel pressure should be recorded at maximum
not protrude into the stack. The manometer check
engine rpm during the Final Run-In.
should produce a reading in inches that is below the
Maximum Exhaust Back Pressure for the engine (refer
Check the air box pressure while the engine is operating
to Section 13.2).
at maximum speed and load. This check may be made
by attaching a suitable gage (0-15 psi) or manometer
(15-0-15) to an air box drain or to a hand hole plate
prepared for this purpose. If an air box drain is used as
the full-load speed to be used during the Final Run-In.
a source for this check, it must be clean. The air box
Apply the load thus determined to the dynamometer.
pressure should be recorded in inches of mercury.
When the above conditions have been met, adjust the
Check the crankcase pressure while the engine is
maximum no-load speed to conform with that specified
operating at maximum run-in speed. Attach a
for the particular engine. This speed may be either
manometer, calibrated to read in inches of water, to the
higher or lower than the maximum speed used during
oil level dipstick opening. Normally, crankcase pressure
the Basic Run-In. This will ordinarily require a governor
should decrease during the run-in indicating that new
rings are beginning to "seat-in".
All information required in Section "E", Final Run-In, of
Check the air inlet restriction with a water manometer
the Engine Test Report should be determined and filled
connected to a fitting in the air inlet ducting located 2"
in. After the prescribed time for the Final Run-In has
above the air inlet housing.
elapsed, remove the load from the dynamometer and
prevents the insertion of a fitting at this point, the
reduce the engine speed gradually to idle speed and
manometer may be connected to a fitting installed in the
then stop the engine. The Final Run-In is complete.
1/4" pipe tapped hole in the engine air inlet housing. If a
hole is not provided, a stock housing should be drilled,
tapped and kept on hand for future use.
F. INSPECTION AFTER FINAL RUN-IN
After the Final Run-In and before the Engine Test
The restriction at this point should be checked at a
Report is completed, a final inspection must be made.
specific engine speed. Then, the air cleaner and
This inspection will provide final assurance that the
ducting should be removed from the air inlet housing
engine is in proper working order. During this inspection
and the engine again operated at the same speed while
the engine is also made ready for any brief delay in
noting the manometer reading. The difference between
delivery or installation which may occur.
the two readings, with and without the air cleaner and
accomplished by rust-proofing the fuel system as
ducting, is the actual restriction caused by the air
outlined in Section 15.3. Also, a rust inhibitor should be
cleaner and ducting.
introduced into the cooling system (refer to Section
Check the normal air intake vacuum at various speeds
(at noload) and compare the results with the Engine
1970 General Motors Corp.
SEC. 13.2.1 Page 5