I would like to ask the experts: how can the radial clearance be measured after assembling the rod boss bushing and the crosshead pin in a reciprocating compressor?

Before assembly, measure the crosshead pin with an outer diameter micrometer and the small-end bearing with an inner diameter micrometer to determine the dimensions; after assembly, simply insert a feeler gauge to fill the gap

Be sure to grind the contact surface with red lead powder.

The answer above is correct; let me add more details. For the measurement of the radial clearance between the crosshead pin and the small-bore bushing: 1. The crosshead pin is divided into three sections, each of which has a \"M\"-shaped shape; the outer diameter of each section is measured using an outside micrometer, so as to determine the roundness and cylindricity of the crosshead pin； 2. For the small-bore bushing, take two cross-sections (there may be oil grooves in the middle that prevent measurement); similarly, for each cross-section, measure its inner diameter using an inside diameter micrometer or dial indicator in a \"cross\" pattern, and calculate the roundness and cylindricity of the pin hole ； 3. By measuring the dimensions of the crosshead pin and the small-end bushing, the gap between them can be calculated. Of course, after assembly, you can also use a feeler gauge to fit it in further. The above work can involve creating tables based on the measurement data, which also facilitates the organization and archiving of future maintenance records. It’s troublesome, sure, but isn’t work supposed to be meticulous and precise? Hehe

Thank you very much for your detailed explanation: handshake

I gave a like to floor 5. Correct answer.

Same as above: victory: