Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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FOR MODELS: JGZ AND JGU SECTION 5 - MAINTENANCE Checking Connecting Rod (Crank Pin) Bearing Clearances 1. Determine bearing wear by checking actual jack and side clearances against the clearance limits given in Table 1-4 on Page 1-13 and the last new bearing clearance check values if available. High copper content in the oil analysis may be an indication of main and/or connection rod bearing wear, and/or chain idler, crosshead, connecting rod bushing wear (excessive use of anti-seize lubricants can also elevate copper content in the oil analysis). 2. Use calibrated dial indicators with 0.0005 inches (0.005 mm) increments and magnetic stands to check clearances. 3. Before rotating the crankshaft, operate the pre-lube pump to lubricate the bearings. 4. Check jack clearance as follows: a. Manually rotate the crankshaft to the highest throw position, install a magnetic stand on the top of adjacent crankshaft web, with a needle type dial indicator placed against the top of the connecting rod near the cap seam as shown in Figure 5-2. Set dial indicator to zero. b. Pull the connecting rod up by using a large bar to pry against the frame on an eye bolt installed in the rod or use a crane and lifting strap, until needle on the face of the dial indicator stops moving to check jack clearance. Repeat to be sure reading is accurate. Dial Indicator Magnetic Base Placement on Top of Crankshaft Web, & Showing Eye Bolt and Pry Bar Using Pry Bar to Check Jack Clearance Needle Type Dial Indicator Placement on Top of Connecting Rod FIGURE 5-2 MEASURING CONNECTING ROD BEARING VERTICAL JACK CLEARANCE - TYPICAL 7/09 PAGE 5 - 3
FOR MODELS: JGZ AND JGU SECTION 5 - MAINTENANCE 5. Check thrust (side) clearance as follows: a. Install a magnetic stand on the side of crankshaft web, with a button type dial indicator placed against the side of the connecting rod, as shown in Figure 5-3. b. Use a large pry bar to pry against the crankshaft web and thrust connecting rod (do not pry on rod cap) tight toward dial indicator. Release pressure on pry bar. Hold rod in place with minimum pressure to keep it from moving. Set dial indicator to zero. Then pry on the connecting rod to thrust it tight in the opposite direction and release pressure. Hold in place with minimum pressure to keep it from moving to determine thrust clearance. Repeat to be sure reading is accurate. 6. Be sure to remove eye bolts, magnetic stands, dial indicators and pry bars after taking readings. 7. After installing a new bearing or new connecting rod, check jack and thrust (side) clearances against the clearance limits. Record values on a copy of the form on page 5-68. 8. Connecting rods need not be removed from the compressor to replace the crank pin bearings. Dial Indicator Magnetic Base Placement Button Dial Indicator Placement Rod Thrust Tight Toward Dial Indicator Rod Thrust Tight Away from Dial Indicator FIGURE 5-3 MEASURING CONNECTING ROD THRUST (SIDE) CLEARANCE - TYPICAL PAGE 5 - 4 7/09
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Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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