What is NOT recommended when installing the compressor drive coupler on a LARGE SHAFT compressor?

The application of a heavy coating of blue Loctite 242 to the entire taper surface of the compressor drive coupler is not recommended. Loctite 242 is a thread-locking adhesive designed to prevent loosening of threaded fasteners due to vibration, but it should not be used on the taper surface of the compressor shaft. The taper is designed for a precise fit, and adding an adhesive can interfere with the mechanical engagement required for proper operation.

Using an adhesive on the taper can lead to improper alignment and can prevent the coupler from securing appropriately, resulting in possible slippage or damage during operation. Instead, a clean and properly torqued mechanical fit is essential for the reliability and efficiency of the compressor.

The other choices reflect best practices for installing compressor drive couplers: cleaning the shaft with an oil-free solvent ensures that no contaminants affect the fit, using a special keyway alignment tool guarantees accurate placement, and torquing the coupling bolt to the specified value ensures that the coupler is securely attached without risking over-tightening.