13.2.1 Run-In Instructions
DETROIT DIESEL 53
power absorbed in a water brake type dynamometer,
g. Adaptor for connecting a vacuum gage or water
as an example, is governed by the volume of fluid
manometer to the blower inlet.
within the working system. The fluid offers resistance
h. Adaptor for connecting a fuel pressure gage to the
to a rotating motion. By controlling the volume of
fuel manifold inlet passage.
water in the absorption unit, the load may be
increased or decreased as required.
i. Adaptor for connecting a pressure gage or mercury
manometer to the turbocharger.
The power absorbed is generally measured in torque
(lb-ft) on a suitable scale. This value for a given
engine speed will show the brake horsepower
In some cases, gages reading in pounds per square
developed in the engine by the following formula:
inch are used for determining pressures while standard
characteristics are given in inches of mercury or inches
BHP = (T x RPM)/5250
of water. It is extremely important that the scale of
such a gage be of low range and finely divided if
accuracy is desired. This is especially true of a gage
Where:
reading in psi, the reading of which is to be converted
to inches of water. The following conversion factors
may be helpful.
BHP = brake horsepower
T = torque in lb-ft
RPM = revolutions per minute
Inches of water
= psi x 27.7"
Inches of mercury = psi x 2.04"
Some dynamometers indicate direct brake horsepower
NOTE: Before starting the Run-In or starting
readings. Therefore, the use of the formula is not
the engine for any reason following an
required when using these units.
overhaul, it is of extreme importance to observe
the instructions on Preparation for Starting
During the actual operation, all data taken should be
Engine First Time in Section 13.1.
recorded immediately on an Engine Test Report (see
sample on page 4).
Run-In Procedure
The procedure outlined below will follow the order of
the sample Engine Test Report.
Certain instrumentation is necessary so that data
required to complete the Engine Test Report may be
obtained. The following list contains both the
A. PRE-STARTING
minimum amount of instructions and the proper
location of the fittings on the engine so that the
1. Fill the lubrication system as outlined under
readings represent a true evaluation of engine
Lubricating System -- Preparation for Starting Engine
conditions.
First Time in Section 13.1.
a. Oil pressure gage installed in one of the engine
2. Prime the fuel system as outlined under Fuel System
main oil galleries.
-- Preparation for Starting Engine First Time in Section
13.1.
b. Oil temperature gage installed in the oil pan, or
thermometer installed in the dipstick hole in the
oil pan.
3. A preliminary valve clearance adjustment must be
made before the engine is started. See Valve Clearance
c. Adaptor for connecting a pressure gage or mercury
Adjustment in Section 14.1.
manometer to the engine air box.
4. A preliminary injector timing check must be made
d. Water temperature gage installed in the thermo-
before starting the engine. See Timing Injector in
stat housing.
Section 14.2.
e. Adaptor for connecting a pressure gage or water
5. Preliminary governor adjustments must be made as
manometer to the crankcase.
outlined in Section 14.
f. Adaptor for connecting a pressure gage or mercury
6. Preliminary injector rack adjustment must be made
-- see Section 14.
manometer to the exhaust manifold at the flange.
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