Figure 7 - Cross Section of Piston Assembly

Figure 10 - Checking Connecting Rod Side Clearance

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-1 300, EL.1600 2. After connecting rod and piston assembly have been removed, temporarily install bearing cap on connecting rod from which cap was removed by loosely installing rod bolts. 3. Position other rod at bottom of stroke by turning crankshaft and remove rod and piston as previously described. 4. Remove piston pin snap rings from piston assembly and press piston pin out of piston and connecting rod. Then remove compression and oil rings from piston using conventional piston ring expander. Refer to Figure 7. Figure 7 - Cross Section of Piston Assembly CYLINDER BLOCK Remove six bolts and lockwashers which secure cylin- der block to crankcase; then separate cylinder block from crankcase. Discard gasket. CRANKSHAFT AND BEARINGS 1. Remove the four crankshaft bearing cap bolts on each bearing cap and remove caps. Discard gaskets. 2. Press the shaft seal from front bearing cap and discard seal. 3. Remove seal and bowed washer or spring from rear bearing cap. IMPORTANT - Do not remove crankshaft and bearings from crankcase unless an inspection reveals the necessity for removal. 4. Place crankcase-crankshaft-bearing assembly in an arbor press, supporting crankcase adjacent to rear bearing. Use an adapter (shown in Figure 8) and press crankshaft rear bearing assembly from crankcase and out through rear bore. Figure 8 - Crankshaft Bearing Adapter 5. When rear bearing is free from case, use a bearing puller and pull rear bearing from crankshaft. 6. Reinstall front bearing in bore of crankcase and press shaft toward front of case. When front bearing is free of crankcase, use the bearing puller and remove front bearing from crankshaft. 7. Crankshaft can then be moved rearward and out bottom of crankcase. CLEANING, INSPECTION AND REPAIR Wash all parts thoroughly in clean solvent. Make sure all carbon deposits are removed from pistons and cylinder head. Be sure all drilled oil passages in crankshaft are open. Clean all carbon from piston ring grooves in piston. If any of the components are not within the specified limits as noted in SPECIFICATIONS in this Section, that particular part must be replaced. CTS-4077Y - Page 8

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