Figure 10 - Checking Connecting Rod Side Clearance

Figure 7 - Cross Section of Piston Assembly

TM-5-3820-256-24-4 Drilling System Well Rotary Truck Mounted Air Transportable 600 Feet Capacity Model LP-12 NSN 3820-01-246-4276 Manual
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AIR COMPRESSOR - MIDLAND BRAKE MODELS EL.1300, EL-1600 UNLOADER Examine unloader components for excessive wear or deformation. Parts which do not conform to standards as noted in SPECIFICATIONS in this Section should be replaced. Inspect unloader spring for loads at specified heights. Visually check unloader pins for damage and measure length. PISTONS Pistons must be inspected for damage, such as cracks or scoring. Measure outside diameter of both pistons just below the compression ring grooves; then compare this diameter with inside diameter of respective cylinder bore. Be sure to measure the piston at 90 degree angle to piston pin bore to insure correct measurement. If piston diameter is more than .020 cm (.008 in.) smaller than cylinder bore, the piston must be replaced. Service pistons are available in .051 cm (.020 in.) oversize. Piston pins must have a light interference fit in piston and a slip fit in the rod. Check fit of compression and oil rings in grooves of pistons and measure clearance. Position each ring in respective cylinder bore and measure ring gap as shown in Figure 9. Refer to SPECIFICATIONS in this Section for ring gap limits and ring groove clearance. Rings must be replaced if not within specified limits. Figure 9 - Measuring Piston Ring Gap CONNECTING RODS Connecting rod bearing inserts must be free of scoring, pitting or any visible wear. Inspect rod bearing fit on crankshaft journals. Be sure to check connecting rod bearing side clearance on crankshaft (Figure 10). Refer to SPECIFICATIONS in this Section for clearances. If connecting rod bearing-to-crankshaft clearance is excessive, new inserts must be installed. If connecting rod side clearance is excessive, a new rod and bearing cap must be installed. Figure 10 - Checking Connecting Rod Side Clearance CYLINDER BLOCK Check cylinder block for cracks and check inside of cylinder bores for scratches, scoring, pitting, out-of-round and taper. Out-of-round should not exceed more than .00127 cm (.0005 in.) or taper not more than .0025 cm (.001 in.) from top to bottom of bore. If excessive taper or out of round is found, the cylinder must be rebored and honed oversize or replaced with a new cylinder block. Service pistons and ring are available in .0503 cm (.020 in.) oversize. CRANKSHAFT Bent or twisted crankshafts cannot be repaired. If rod journals are scored beyond repair or worn more than limits listed in SPECIFICATIONS, replace the crankshaft or regrind journals. New insert bearings are available in .0254 cm (.010 in.) .0508 cm (.020 in.) and undersize. If a main bearing journal has a sleeve and the journal is scored beyond repair or worn more than the limits, listed in SPECIFICATIONS in this Section, the crankshaft must be replaced. Threads, keyway, and all ground and machined surfaces must not be mutilated or worn. Examine ball bearing for worn or damaged balls; rotate bearing by hand to detect roughness. If wear, roughness, or damage is evident bearing must be replaced. CTS-4077Y Page 9 AIR COMPRESSOR - MIDLAND BRAKE MODELS EL-1300, EL-1600

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