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Overall walk-around of F-1 engine.

Picture 5 of 7.

The engine handler contains a number of warnings:

Max Towing Speed 2½ MPH

Install screw hand tight & torque 20-40 in-lbs with engine in assembly position

WARNING: Do not release 9024731 truss assy from engine or handler chassis unless engine is supported above with G4050 sling

Someone has also hand-labelled the handler with "S/N 4023", the engine's serial number (in black Sharpie just to the right of "Speed 2 1/2 MPG").