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Posted by Matt W. (93SE) on August 14, 2002 at 15:18:56:
In Reply to: VTFC posted by Matt W on August 13, 2002 at 14:29:38:
I guess what I'm really trying to find out is exactly what this nasty sound is. I understand inside the VTC housing there's a helical (spiral) gear, that is actuated by a piston. The piston is hydrolically controlled by the VTC solenoid, and essentially rotates the cam relative to the sprocket. The spring that's also in there is intended to return the cam to the normal position - in essense to push the piston back in place. So my understanding is that this spring breaks paper-clip style, which means that there's nothing holding the helical gear in place, which means that the cam can rotate relative to the timing chain. OK - so I can see how that would mess w/ the timing. I can also see that if the spring is broken then you might hear it rattling around in there - ticking. What I'm confused about is what the tech said about the oil-pressure drop causing slapping? Anyone have ANY idea about that? I know that the lash adjusters for the rocker-arms are hydrolic - might that have something to do with it? (here's the relevant page from the chilton's manual:
Hey - thanks for the links guys! Unfortunately I've already read all those :)
http://www.cybrrpartspro.com/Chilton%20Manuals/8961m/8961CH03_30.HTML)
thanks again guys!