Start engine and run until smoothly operating.
Slowly open preservative oil shut-off valve while closing diesel fuel shut-off valve.
Operate engine for 5 to 10 minutes at 1500 rpm on preservative oil only (preservative oil shut-off
valve fully open; diesel fuel shut-off valve fully closed).
appears at outlet port.
Shut down engine.
Reconnect air compressor lines to compressor.
Disconnect engine fuel pump filter inlet line and install cap on fuel inlet fitting.
Disconnect injector drain line from engine T-fitting and install cap on T-fitting.
Allow cylinder head temperature to cool to 100 F (38C). It is permissible to accelerate cooling
process with fans or other appropriate cooling methods.
Remove aftercooler (TM 9-2320-281-34), turbocharger (TM 9-2320-281-20), and exhaust
manifold (para 3-6 f).
Remove rocker arm covers (TM 9-2320-281-20).
Manually depress each intake valve and while each val ve is open, atomize spray 1/2 ounce of
MIL-L-21260, Type 1, Grade 10 oil into each intake port.
Manually depress each exhaust valve and while each valve is open, atomize spray 1/2 ounce of
MIL-L-21260, Type 1, Grade 10 oil into each exhaust port.
ENGINE CAN FIRE AND RUN ON PRESERVATIVE OIL IN THE FUEL LINES.
Rotate crankshaft at least two complete revolutions.
Repeat steps (23) and (24) above.