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I bet your sprocket is fine...
Posted by Yaofeng [Email] (more from Yaofeng) on Wed, 21 Jul 2004 07:34:21
In Reply to: Stupid mistake! (long), aeroblues, Wed, 21 Jul 2004 04:52:44
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I suspect something was not put together correctly when you had your timing chain done. It could be the Woodruff key not seated correctly or the harmonic balancer not tightened to spec. of 129 ft-lbs, or both.
The oil pump, balance shaft sprocket and the timing chain sprocket on the crank shaft are locked in place by the Woodruff key on a slot on the crank shaft. The timing chain sprocket, being at the back end of the key, is in contact with the key only at the tip. It is very likely the tip was sheared off, so when the crank shaft turns it does not drive the timing chain sprocket. This could have been caused by improper seating of the Woodruff key, or your crank shaft pulley too loose. In the latter case the sprocket could walk on the crank shaft and wander to a location whaer the shearing area is not sufficient to drive the chain.
It goes without saying all valves are bent.
posted by 165.254....
Posts in this Thread:
- Stupid mistake! (long), aeroblues, Wed, 21 Jul 2004 04:52:44
- Re: Stupid mistake! (long), TERRY, Wed, 21 Jul 2004 20:36:43
- I bet your sprocket is fine..., Yaofeng, Wed, 21 Jul 2004 07:34:21 <-- Viewing This Message
- So, how are your valves?, zeke, Wed, 21 Jul 2004 06:47:02
- Re: Stupid mistake! (long), Yaofeng, Wed, 21 Jul 2004 06:01:23
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