Re: Purpose of freewheel for Saab trans - Saab Sonett Bulletin Board - Saabnet.com
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Re: Purpose of freewheel for Saab trans
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Posted by Andy [Email] (#759) [Profile/Gallery] (more from Andy) on Mon, 25 Sep 2000 06:02:47 Share Post by Email
In Reply to: Re: Purpose of freewheel for Saab trans, Jason, Sun, 24 Sep 2000 23:24:41
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The free-wheel device is basically a one-way clutch. The hub of the free-wheel, splined to the clutch shaft, has several spring-loaded rollers on "ramps". When you accelerate, the rollers move up the "ramp" and press against the inside of the outer ring, which is part of the input shaft of the transmission. When you lift off the gas, the transmission shaft is turning faster than the clutch shaft and the rollers release their grip on the inside of the ring and the free-wheel "slips". A good 95/96 manual has several drawings that show the free-wheel hub operation. Seeing the pictures would make it more understandable than all the description I could give you.

There is a lockout device that slides along the clutch shaft splines and locks the clutch shaft to the outer ring of the input shaft. It is controlled with the lever near the floor. The free-wheel automatically works when you lift your foot unless the driver has the lockout engaged. The car has to be stopped to shift it into lockout position because the teeth on the lockout device might not be aligned with the teeth on the input shaft ring, but it can be unlocked while accelerating. I rarely drove my '67 96 V-4 with the free-wheel locked out, other people prefer to never use the free-wheel feature. Because of worn hub/roller assemblies, some cars have had the freewheel disabled by welding the lockout to the input shaft.

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