Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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FOR MODELS: JGZ AND JGU SECTION 5 - MAINTENANCE 4. New bearing shells and connecting rod to shell surfaces must be absolutely clean and dry. Snap a new dry bearing half shell into the rod with the bearing tab properly located in the notch. Manually rotate the crankshaft to position the throw to near the inner dead center position. Oil crankshaft crank-pin bearing surfaces with new clean lubricating oil, same type as is used in the frame, before installing connecting rods. Slide the rod into place into the crosshead guide space through the guide window with markings/bearing-shell-tab up. NOTE: THE CAPS AND CONNECTING RODS ARE NUMBERED BY THROW BEGIN- NING WITH NUMBER ONE AT THE DRIVE END. FOR THROW NUMBERING SEQUENCE, REFERENCE FIGURE 1-1 ON PAGE 1-3. ALWAYS INSTALL RODS WITH THE NUMBERS UP. BE SURE TO PROTECT CRANK PIN AT ALL TIMES. 5. Clean and dry the connecting rod cap. Install a new dry bearing half shell with the tab properly located in the cap notch. Fit the connecting rod to the crank pin, and while supporting the rod, manually rotate the crankshaft to position the throw to near the highest position. Reinstall the bearing cap on to the crank pin/ connecting rod with the markings/bearing tab up. Lubricate cap screws with lubricating oil or Lubriplate 630. Snug up the cap screws with a hand wrench. Do not tighten cap screws to full torque at this point. 6. Install the crosshead and attach it to the connecting rod, see “Crosshead - Installation” on Page 5-12. 7. Tighten the connecting rod cap screws in an alternating (criss-cross) pattern in 25% increments for each cap to the recommended pre-torque value, and then tighten the cap screws in an alternating (criss-cross) pattern to the recommended turn value. See Table 1-11 on Page 1-18 for values. Utilize a turn indicator tool to achieve the additional torque-turn degrees. The separately purchased hydraulic connecting rod/main bearing-caps cap screw torquing tool (see Figure 7-12 on Page 7-7), is used to achieve the additional turn degrees. The hydraulic tool is provided with its own turn indicators. This tool reacts against the opposite diagonal cap screw. After the pre-torque has been achieved, be sure that hydraulic tool is configured for tightening the connecting rod cap screws. With the 110° turn indicator furnished with the tool installed on the drive socket, set to the reference mark on the tool, so that the recessed area will indicate the additional turn degrees. 8. Operate the pre-lube pump and visually inspect bearing locations for oil flow. 9. Measure each connecting rod bearing to crankshaft jack clearance and connecting rod thrust (side) clearance, see “Checking Connecting Rod (Crank Pin) Bearing Clearances” on Page 5-3. Record readings on a copy of the form on page 5-68. If readings are not within tolerance after installing new bearings, contact your packager or Ariel before proceeding. 10. Install the piston-rod-assembly as described in “Piston and Rod - Installation” on Page 5-40. 7/09 PAGE 5 - 7
FOR MODELS: JGZ AND JGU SECTION 5 - MAINTENANCE Tighten Connecting Rod Bolting to the Torque and Turn Values in Table 1-11 on Page 1-18. The additional degrees turn is achieved using the separately purchased hydraulic connecting rod/main bearing-caps cap screw torque turn tool, see Figure 7-12 on Page 7-7. Note: Install Joint Match Marks/Throw Numbering Up FIGURE 5-4 CONNECTING ROD - TYPICAL Correct Orientation of the Rod is with Bearing Shell Notches at Top Joint. Bearing Shell 2-Piece Bushing 11. Reinstall the top-cover spacer bars. Be sure that spacer bar o-rings in the crosshead guide under the cap screw heads are in place and in good condition, replace if necessary. All spacer bars are match-marked for proper location. They must be reinstalled in their original location. Utilize Top-Cover Spacer Bar Alignment Tools (A-11987). These spacer bars are also used as gasket surfaces to top covers. See Figure 7-4 on Page 7-3. Lubricate cap screws with lubricating oil or Lubriplate 630. Install and tighten all spacer bar cap screws to the value listed in Table 1-11 on Page 1-18. 12. Examine the top cover and side cover gaskets. Install new gaskets if there is any doubt that old gaskets are not in a good usable condition. Top cover gaskets are to be replaced as a complete set, as used and new gasket pieces installed side by side under the same top cover can cause oil leaks. Before installing a gasket, apply a thin coating of anti-seize lubricant to both sides or to the metal seating surfaces. This will help to hold the gasket in place during assembly and aid in ease of removal. Reinstall the top covers and crosshead guide covers. Tighten all cover cap screws hand-wrench tight. 13. After replacing bearings or connecting rod it is important to check the bearing break-in temperatures. When starting the compressor after the first 10 minutes of run time, after one hour and after 4 hours, shutdown compressor and remove the frame top covers. Immediately (within 5 minutes after shutdown), check the bearing cap temperatures using a temperature probe (hand held thermocouple probe or infrared thermometer), record values on a copy of form on page 5-68. If a variation more than 8°F (4.5°C) is measured between any two connecting rod bearings, contact Ariel. CAUTION: DO NOT PLACE ANY PART OF YOUR BODY INSIDE THE CRANKCASE WITHOUT OBSERVING THE CAUTION ON PAGE 5-1. 14. Complete remaining information on the copy of “BEARING LOG FORM/CONDI- TIONS AFTER REPLACING BEARINGS” on Page 5-68” and fax copy to Ariel Technical Services. PAGE 5 - 8 7/09
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Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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