Sale AeroShell Grease 22
Do you need to clean out the old stuff before using the new? Yes, particularly when changing from an organic-based product to an inorganic. There may be adverse chemical reactions that lessen the grease effectiveness.
For example, if you switch from Shell 5 to Shell 22, cleaning the bearings becomes particularly important. Even more so in applications such as in prop hubs, where corrosion damage can be very expensive to fix.
When repacking bearings, it's a good idea to clean them for other reasons as well, such as for inspection of the metal surfaces. Any good solvent will work fine, and as always recommended, don't spin dry bearings with shop air.
For grease fittings, you are obviously not going to disassemble the joints just to clean out old grease. The only thing you can do is be sure to run enough new grease into the fitting to displace as much old grease as possible, and stick with one type of grease (and the same brand).
Be sure to clean off the old, expelled grease, as it's not healthy for paint if left on for prolonged periods. Air loads can spread it everywhere.
Download MSDS AeroShell Grease 22
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AEROSHELL Grease 22 is a fully synthetic grease designed for severe operating conditions including high bearing loads, high speeds and where long grease retention and high water resistance are required - covers the operating temperature from –65 °C to + 204 °C.
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