Reasons why the crosshead rod of the air compressor cannot move axially
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When the clearance at the large end of the connecting rod is appropriate, the crosshead is secured with the shaft screw at the small end of the connecting rod; the crankshaft cannot be moved manually, nor can the connecting rod move axially. After increasing the clearance at the large end of the connecting rod by 15 threads, it is possible to turn the shaft by hand, but the connecting rod still cannot move axially. I would appreciate it if experienced experts could help analyze why this is the case. Thank you.
Measure as a whole, reinstall in sections. Measurement is taken after each section is reinstalled, via manual rotation (cranking). It’s probably a problem with concentricity; in local slang, this is called “bias”. Oh, and it’s also important to apply light oil to the bearings at each friction point. Also, try turning the piston ring after installation, and check for sticking points section by section. For reference.
Maybe the crosshead is misaligned. The centerlines of the large and small ends of the 2-link rod are not parallel
1. Check whether the axial clearance of the connecting rod cap bearing is appropriate? 2. Check whether the end portion (curved surface) of the connecting rod pin rubs against the crosshead body 3. Check whether the connecting rod is bent or deformed?