Date: Sun, 09 Apr 2000 11:20:31 -0400
From: (Robert Anderson)
Subject: Re: Timing Chain

In article <8coce5$e1d$>, coxinga <> wrote: --snip-- > After the timing chain came off. I finally realized what happened. > The oil pump, balance shaft chain sprocket, and the timing chain > sprocket, are all held on the crank shaft by a Woodriff key. It is a > crescent shaped key fitted on a slot on the crank shaft. What happened > was the timing chain sprocket, being on the inside, engages on only the > tip of the crescent. Overtime, the small area at the tip of the > crescent failed in fatigue. (Does SAAB engineers has the wisdom to > design the key so it failed just a little ove 100k mile? I wonder.) --snip-- Woodruff keys are locating devices. They are not intented to carry load of the sprocket. If the woodruff key failed, it indicates that the timing chain sprocket was loose. /Bob

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