Having just installed a new fan, new ISO mounts and fibre couplers I can tell you that if the snap ring on your old fan is not there you need to pick up a new one when you order the fan. I used Loctited on the shaft where the fan goes because the new fans are not tight enough on the shaft even with the snap ring. I also used two fiber couplers on each end of the shaft because my old ones were terribly twisted. If you do this you will have to redrill the roll pin hole nearest the engine. Other than that it's an easy job. Too bad it still shakes.
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Chris
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