Section I. GENERALFigure 1. AN-M4 3 1/2 CFM Compressor.Figure 1. AN-M4 3 1/2 CFM Compressor. - ContinuedFIELD MAINTENANCE INSTRUCTIONS-THIRD ECHELONSection III. COMPRESSOR GROUPFigure 2. Water separator group, exploded view.Figure 3. Water separated, exploded viewFigure 4. Oil sump accessories, exploded view.Figure 5. Gasoline engine accessories, exploded view.Figure 6. Fuel tank accessories, exploded view.Section II. WATER SEPARATOR GROUPSection II. WATER SEPARATOR GROUP - ContinuedFigure 7. Water separator relief valve, exploded viewSection III. FAN GROUPFigure 8. Fan and fan guard, exploded view.Section V. COMPRESSOR GROUPFigure 9. Intercooler and afterSection V. COMPRESSOR GROUP - ContinuedFigure 10. Removing compressor group, exploded view.Figure 11. Third stage section, exploded view.Figure 12. Second stage section, exploded view.Figure 13. First stage valve, exploded viewFigure 14. First stage piston, exploded view.Figure 15. Keystone-crankshaft, exploded view.Figure 16. Crankcase, exploded view.Figure 16. Crankcase, exploded view. - ContinuedFigure 17. First stage head clearance.Figure 18. Second stage head clearance.Second Stage AssemblyFigure 19. Third stage head clearance.Table I. Four-Hour Run-In Procedure.Figure 20. Engine group, partial exploded view.Section VII. FRAME-FUEL TANK GROUPSection VIII. PERIODIC SURVEILLANCE TESTFigure 21. Frame and fuel tank section, exploded view.DEPOT MAINTENANCE INSTRUCTIONS - FIFTH ECHELONREFERENCES