ic Run-In at full load. It should be re-
3. Basic Run-In Inspection
corded
and
should
be
within
the
specified range.
While the engine is undergoing the Basic
Run-In, check each item indicated in
Section "C" of the Engine test Report.
must be taken while the engine is operat-
Check for fuel oil or water leaks in the
ing at full load and after it has been op-
rocker arm compartment.
erating long enough for the temperature
to stabilize. This temperature should be
During the final portion of the Basic
recorded and should be within the speci-
Run-In, the engine should be inspected
fied range.
for fuel oil, lubricating oil and water
leaks.
recorded in psi after being taken at en-
Upon completion of the Basic Run-In and
gine speeds indicated in the Operating
Inspection, remove the load from the dy-
Conditions, Subsection 11A.
namometer and reduce the engine speed
gradually to idle and then stop the en-
The fuel oil pressure at the fuel manifold
gine.
inlet passage should be recorded and
should fall within the specified range.
4. Inspection After Basic Run-In
Fuel pressure should be recorded at max-
imum engine speed during the Final
The primary purpose of this inspection is
Run-In.
to provide a fine engine tune-up. First,
tighten the cylinder head and rocker arm
Check the air box pressure while the en-
shaft bolts to the proper torque. Next,
gine is operating at maximum speed and
complete the applicable tune-up proce-
load. This check may be made by attach-
dure.
ing a suitable (0-15 psi) or manometer
(15-0-15) to an air box drain or to a
5. Final Run-In
hand hole plate prepared for this pur-
pose. If an air box drain is used as a
After all of the tests have been made and
source for this check, it must be clean.
the Engine Test Report is completed
The air box pressure should be recorded
through Section "D", the engine is ready
in inches of mercury.
for final test. This portion of the test
and Run-In procedure will assure the
engine owner that his engine has been
engine is operating at maximum Run-In
rebuilt to deliver factory rated perform-
speed. Attach a manometer, calibrated
a n c e at the same maximum speed and load
to read in inches of water, to the oil lev-
which will be experienced in the installa-
el dipstick opening. Normally, crank-
tion.
case pressure should decrease during
the Run-In indicating, that new rings are
If the engine has been shut down for one
beginning to "seat-in.
hour or longer, it will be necessary to
have a warm-up period of 10 minutes at
Check the air inlet restriction with a wa-
the
same
speed
and
load
used
for
ter manometer connected to a fitting in
warm-up in the Basic Run-In. If piston
the air inlet ducting located 2" above the
air inlet housing. When practicability
been replaced as a result of findings in
prevents the insertion of a fitting at this
the Basic Run-In, the entire Basic
point, the manometer may be connected
Run-In must be repeated as though the
to a fitting installed in the 1/4" pipe
Run-In and test procedure were started
tapped hole in the engine air inlet hous-
anew.
ing. If a hole is not provided, a stock
housing should be drilled, tapped, and
All readings observed during the Final
kept on hand for future use.
Run-In should fall within the range spec-
ified in the Operating Conditions in Sub-
The restriction at this point should be
section 11A, and should be taken at full
checked at a specific engine speed.
load unless otherwise specified. Follow-
Then the air cleaner and ducting should
ing
is
a
brief
discussion
of
each
be removed from the air inlet housing
condition to be observed.
and the engine again operated at the
same speed while noting the manometer
The engine water temperature should be
reading. Take the reading on the inlet
taken during the last portion of the Bas-
11H-11
Engine Tune-Up