danbuc Posted March 19, 2005 Report Share Posted March 19, 2005 Well, I've had this knock for a while now, and I finally got around to pulling the intake cover, and looking for it. I got out my trusty have inch, 2 foot section of rubber fuel tubing, and went to town. I checked all around the edge of the intake manifold, I checked on the side of the block, above the crank pulley, I checked verywhere I could. When I slipped thew hose underneath the manifold, up against the top f the block, that's when things got interesting. With the hose pressed up againts the top of the block, near cylinder #1, the noise was loudest and clearest. Looing in my Service manual under Engine Noise Diagnosis, they list a few different types of knocks. A main bearing knock happens at every engine rotation. Since this knock barely increases it's rithym, whether at 600rpm, or 1500rpm, I've decided it's not that. A connecting rod bearing knock will increase volume with engine speed, and is loudest unde decceleration. Since this knock does not get louder when the engine rev's, I've also determined that this is not the source. The one that really interests me though, is a timimg chain, or sprocket noise. They say it's the most common type of abnormal engine noise, and usually in the form of a high frequency knock. My engine knock, is relatively high in pitch, and seems to be located high up on the engine. It then says that this noise will generally be the same intensity, whether at idle, higher speeds, or under load. Since the knock does not change volume when you rev the engine, and end up get drowned out by other normal engines noises, I believe I might have finally found the source. I'm going to remove the valve covers at school next wekk if I can, and inspect the cam gears for worn, or broken teeth.After that, I'll need a way to pull the front cover, and inspect the intermediate sprocket, where the timing chain attach. That's going to be a pain. Sorry for the random post, I just had tell you this. It's been bugging me for almost a year, and now I think I've finally solved it. All I need to do now is fix it...hehe. Quote Link to comment Share on other sites More sharing options...
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