Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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Section 4 Part Replacement For Models: JGH:E:K:T 2. Detach connecting rods and move them to their full outer position (see “Connecting Rods” on page 4-28). Do not damage the crosshead guide surfaces. 3. Remove main (journal) bearing caps capscrews. Pull caps straight up to prevent damage to the dowel fit. If cap is tight, use a bearing cap puller (see Fig. 4-37). 4. If needed, attach clean nylon straps around the crankshaft and lift it slightly to lessen weight on the bearings and allow easier bearing shell disassembly. 5. Remove shells from main bearing caps. Remove main journal bearing shells from under the crankshaft one at a time. To remove, rotate shell under the crankshaft, tab side out first, by pushing or tapping with a non-metallic tool on the opposite split face side. Once completely loose, use Ariel optional tool (part number B-3340 or fabricated from a print supplied by Ariel) to push out shell a little. Do not damage crankshaft bearing surfaces. Replace with new bearing shell, prior to rotating out the next main bearing shell, see steps below). 6. Clean and dry main bearing cap to bearing surfaces. 7. Check new bearing shells for damage, scratches, burrs, and loose material at the tab. DO NOT RUB BEARING SURFACE WITH FINGERNAIL. Installation requires perfectly clean bearing shells. New bearing shells are stamped with ink pictographs of a frame or connecting rod, for main and connecting rod bearings respectively. Do not mix them up. Install bearing shells in caps, and frame journals, properly located in the tab notch, (rotate in the untabbed end first), keeping the backs of the shells dry and clean. NOTE: Main bearings and connecting rod bearings are not interchangeable. Do not put main bearings in connecting rod bearing locations. Do not mix part numbers on an individual main or connecting rod. Both bearing half shells must have the same part number. 8. Replace bearing cap #1 thrust plates if crankshaft thrust clearance is not within tolerance. 9. Oil crankshaft bearing surfaces with the same clean lubricating oil used in the frame. 10. Install bearing caps containing new bearing top halves with capscrews lightly snugged in their proper locations. Install thrust plates on #1 bearing cap. Starting at the thrust end, use the torque procedure and Table A-3 in Appendix A to tighten the bearing cap bolts to the correct torque. Bearing caps have position match-marks corresponding with the spacer bar and spacer bar bosses on the frame. 11. Verify proper alignment of bearing cap dowels with the holes in the crankcase base. A set screw on top of each dowel prevents it from backing out. 12. Check crankshaft journal bearing jack (at each bearing) and crankshaft thrust clearances to values in Table B-1 in Appendix B (see Fig. 4-40). Record readings on a copy of the form in Appendix D. 13. Install new connecting rod bearings and reattach connecting rods (see “Connecting Rod Installation” on page 4-30). Tighten fasteners to torque values in Table A-3 in Appendix A. Check connecting rod bearing jack and thrust clearances (see “Connecting Rod Bearing Removal and Installation” on page 4-28). Record readings on a copy of the form in Appendix D. 14. If readings are not within tolerance after installing new bearings, contact your packager or Ariel before proceeding. 15. Install spacer bars so the match mark is up and next to the spacer bar boss with the same mark. Tighten all spacer-bar capscrews to value in Table A-3 in Appendix A. 16. Account for all tools, equipment, supplies, and parts to ensure none are left inside the crankcase. Lubricate both sides of cover gaskets with anti-sieze lubricant or multi-purpose grease to ease future removal. Reinstall gaskets and top cover(s). Tighten cover bolts hand wrench tight. 17. Replace coupling spacer to packager's recommendations or remove lockout. 18. After replacing bearings, thoroughly pre-lube compressor to ensure bearing lubrication and to help remove foreign materials from the lube system. PAGE 4-34 3/11
For Models: JGH:E:K:T Section 4 Part Replacement 19. Run then shutdown the compressor for ten minutes, one hour, and four hour run times. After each shutdown, remove the frame top cover. Check bearing cap temperatures with a hand held thermocouple probe or infrared thermometer and record on a copy of the form in Appendix D. DO NOT PLACE ANY PART OF YOUR BODY INSIDE THE CRANKCASE WITHOUT OBSERVING THE CAUTION ON PAGE 4-33. Complete remaining information on the form in Appendix D and fax it to Ariel Technical Services. Main Bearings - Checking Clearances 1. Do not remove main bearing caps to check bearing wear. If a cap is removed, replace the bearing. DO NOT REUSE BEARING SHELLS. 2. To determine main bearing wear, compare journal bearing vertical jack (at each bearing) and crankshaft thrust clearances against clearance limits in Table B-1 in Appendix B. Use calibrated dial indicators with 0.0005 inch (0.005 mm) increments and magnetic stands to check clearances. To measure main bearing vertical jack clearances: • Turn an adjacent throw up, as shown in Fig. 4-40. • Place lifting strap completely around the crankshaft at the adjacent web and attach strap to a crane. • Install a magnetic stand on the top of the main bearing cap, with a needle type dial indicator placed against the top of the crankshaft web of the adjacent turned up throw. • Gently lift crankshaft with crane until dial indicator needle stops moving. • Repeat for each main bearing. Dial indicator magnetic stand placement on top of a main bearing cap Needle-type dial indicator placement on top of adjacent crankshaft web. Lifting strap placement around crankshaft web - attach strap to a crane. FIGURE 4-40 Measuring Crankshaft Journal Bearing Vertical Jack Clearance - Typical 3. To measure crankshaft thrust clearance: • Install a magnetic stand on the top of #1 main bearing cap, with a button type dial indicator placed against the side of the adjacent crankshaft web, see Fig. 4-41. • Thrust crankshaft back and forth with a pry bar against the compressor frame, until an accurate reading is obtained. • If thrust clearance is out of limits, replace thrust plates at #1 main bearing cap. 3/11 PAGE 4-35
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Maintenance and Repair Manual For J
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For Models: JGE:H:K:T Oil Strainer.
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For Models: JGE:H:K:T SECTION 5 - S
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For Models: JGH:E:K:T FIGURE 4-23
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For Models: JGH:E:K:T General Safet
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For Models: JGH:E:K:T Ariel Contact
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Section 1 - Tools For Models: JGH:E
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Section 1 - Tools For Models: JGH:E
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Section 2 - Instrumentation For Mod
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Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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