TM 5-3805-262-343-12. AIR BRAKE SYSTEM MAINTENANCE (CONT)e. AirCompressorAssembly (Cont).(2) Cylinder Block and Crankcase (Cont).INSPECTION (SHEET 2 OF 3)(e) Measure diameter of piston (18) at a 90 degree angle to wrist pin boreusing micrometer. Record measurement.(f) Measure diameter of cylinder block bore associated with piston measuredabove at a 90 degree angle to wrist pin using bore gage and micrometer.Record measurement.(g) If difference between measurements in step (e) and (f) above is morethan 0.008 inch, either a new piston must be installed, cylinder block(2) bore diameter must be increased to next larger diameter listedbelow, or a new cylinder block must be installed.Standard bore diameter1.9995 to 2.0000 inches0.010 inch oversize diameter2.0095 to 2.0100 inches0.020 inch oversize diameter2.0195 to 2.0200 inches(h) Repeat steps (e) through (g) above for other piston (18).(i) Measure diameter of rear journal on crankshaft (27). If measurement isless than 1.3779 inches, a new crankshaft must be installed.3-484
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