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 TM 55-1905-221-14-3
6-22.
POWER UNIT - MULTIPLE ENGINE REMOVAL - AND RUN-IN INSTRUCTIONS
(Continued).
LOCATION/ITEM
ACTION
REMARKS
OVERHAUL (Cont)
After performing the preliminary steps, be sure all water valves, fuel valves, etc. are open. Also inspect the
exhaust system, being sure that it is properly connected to the engine. Always start engine with minimum dynamometer
After engine starts, if using a water brake type dynamometer, allow sufficient water, by means of the control
loading valves, into the dynamometer absorption unit to show a reading of approximately 5 lb-ft on the torque gage (or
10-15 hp on horsepower gage). This is necessary, on some units, to lubricate the absorption unit seals and protect them
from damage.
Set the engine throttle at idle speed, check lubricating oil pressure and check all connections to be sure there are
no leaks.
Refer to the Engine Test Report sample which establishes the sequence of events for test and run-in, the Basic
Run-in Horsepower Schedule which indicates the speed (rpm), length of time and the horsepower required for each
phase of the test. Also, refer to the Operating Conditions which present the engine operating characteristics. These
characteristics will be a guide for tracing faulty operation or lack of power.
It is important that the following items be observed:
1
Any engine to be run at speeds in excess of 1800 rpm must be equipped with a vibration damper. The
Basic Run-in does not require the use of a vibration damper; however, if the Final Run-In is to be above
1800 rpm, a damper must be installed. A viscous damper must be used on models operated at 2000
rpm or above.
6-282
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