Join Date: Jul 2006
Location: Northfield, Illinois
Plastic fans become brittle with age. They are actually a type of nylon, I believe. They are a replacement item. The support ring in front of the hub MUST be used, the bolts NOT tightened terribly tight. If you fear they will loosen with use, put a dab of silicone sealant on the threads before tightening.
If you examine blown up fans, they will fail with a blade breaking off from a nick in the edge, or come apart at the hub, from over tightened bolts. It's not a bad plan to replace the fan every 5 or 6 years, buying new from one of our good sources.
Years ago in racing, we used to boil them in a large pot of water for 15 minutes before initial installation. The thought was it stabilized stresses in the material. This came from radio controled model airplane builders that did the same with thier nylon propellers.
All the short blade GTA fans were boiled, and many are still around. Maybe boiling had a benefit.
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