ARMY TM 9-2815-260-24 AIR FORCE TO 38G1-126-2 MARINE CORPS TM 09244A/09245A-24 4-100 a. Lift engine using the following steps; (1) Attach Engine Lifting Sling to engine lifting straps and overhead hoist on floor crane. NOTE Use of an engine lifting sling as shown in Figure 4-63 is the only APPROVED method of lifting an engine. FIGURE 4-63.  ENGINE LIFTING   (2) Carefully lift engine to desired location. CAUTION When servicing turbocharged engines on a rollover stand, disconnect turbocharger oil inlet line from the oil filter housing or turbocharger before rolling engine over.  Failure to do so may cause a hydraulic lock upon starting engine.  Hydraulic lock may cause possible engine failure. NOTE Hydraulic lock is the event that occurs when trapped oil in the oil filter housing drains through the turbocharger, to the exhaust and intake manifolds, and into the cylinder head.  After starting the engine, the trapped oil in the manifold and head is released into the cylinder(s) filling them with oil causing hydraulic lock and possible engine failure.