TM 5-3805-260-24ENGINE TEST PROCEDURELUBRICATION FOR A REBUILT ENGINEIt is very important for a rebuilt engine to have"adequate" (needed) lubrication during the first secondsof operation. A "dry start" (without needed lubrication) ona rebuilt engine can cause bearing damage.When an engine is rebuilt with new parts, oil is puton each part as it is installed This is generally enoughlubrication for engine start-up. However, this lubricationmay not be enough or may be lost if the rebuilt engine isplace in storage for any length of time.When a factory assembled short block assembly isinstalled, the oil used at the factory has, to give thisneeded lubrication. However, the factory oil applicationcan flow off the parts in a short block during storage orshipment. As a result the parts in a rebuilt engine will nothave "adequate" lubrication start-up.To prevent the possibility of a "dry start" and bearingdamage during the first seconds of running, use the1P540, Flow Checking Tool Group, and Shop airpressure to pressure lubricate (fill the main oil passagewith oil under pressure) all rebuilt engines.Procedure for Pressure Lubrication1. Clean the tank of the IP540 Flow Checking ToolGroup thoroughly, and set the pressure regulator to35 5 psi (240 +35 kPa).WARNINGAir pressure should not be more than 50 psi (345kPa) at any time.2. Put approximately one gallon of engine oil In the tank.PRESSURE LUBRICATION(Using the 1 P540 Flow Checking Tool Group)3. Connect the tools to the engine as shown. Thetap shown is connected to the main oil passage.4. Add air pressure to the tank, with the regulator set at35 + 5 psi (240 + 35 kPa). Although the tank doeshaxve a hand pump, it is difficult to get enough airpressure to do the job with the hand pump.Therefore, use of shop air is recommended.5. Let the one gallon of engine oil flow into the oilpassage under pressure.When filling the crankcase, put in one gallon of oilless than the recommendation in the Lubrication andMaintenance Guides, if engine has received thispressure lubrication application. Also if the engine is notgoing to be used for a long time, do the aboveprocedure again before the first starting.If shop air is not available for charging the tank, thehand pump may be used to get the minimum requiredpressure.CAUTIONDo not use the same 1 P540 Flow CheckingTool Group for both "pressure lubricationapplication" and for checking fuel flow. Incorrectcleaning is probable if the tool is used for bothfuel and lube oil. Even a minute amount of dirt inthe fuel system can cause fuel nozzle failure.DYNAMOMETER TEST PRECAUTIONTo avoid possible engine damage while testing on adynamometer, the thermostats must be installed and theshunt line connected as shown.SHUNT LINE CONNECTED TO ENGINE3-393
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