280znewbie Posted January 15, 2017 Share Posted January 15, 2017 L28et swap into 76. My motor has always had a lite bit of a rattle but it has gotten worse to the point it scares me. Noise comes from the top of the front cover. Car runs great. Does this sound like an upper guide or the lower tensioner? Quote Link to comment Share on other sites More sharing options...
TimZ Posted January 15, 2017 Share Posted January 15, 2017 L28et swap into 76. My motor has always had a lite bit of a rattle but it has gotten worse to the point it scares me. Noise comes from the top of the front cover. Car runs great. Does this sound like an upper guide or the lower tensioner? Could be either. Or something else. Sounds like it's time to pull the valve cover and look. Quote Link to comment Share on other sites More sharing options...
280znewbie Posted January 15, 2017 Author Share Posted January 15, 2017 Definitely from the front top of the motor. Valve cover was off a year ago. All the lobes were perfect. Everything seemed tight. Is the little plate on the front of the head allow you into the tensioner or guide? Quote Link to comment Share on other sites More sharing options...
NewZed Posted January 16, 2017 Share Posted January 16, 2017 You said the rattle had gotten worse Gotten worse within the year that's passed since you last had the cover off? There are people on the forum who probably have their valve covers off once a week or more. Quote Link to comment Share on other sites More sharing options...
280znewbie Posted January 16, 2017 Author Share Posted January 16, 2017 (edited) By gotten worse I mean it is louder since putting the car away in October. I removed the clutch fan and went to electrics so now I hear everything even clearer which makes it seem louder. People have the valve covers off once a week? For what purpose? U don't have to touch the valves for thousands of miles. Any idea if it is just the guides or the tensioner? I know it isnt valves. They're all gapped fine and the noise is from the front cover. Could the sound be from a failing water pump or the bearing? Edited January 16, 2017 by 280znewbie Quote Link to comment Share on other sites More sharing options...
TimZ Posted January 16, 2017 Share Posted January 16, 2017 By gotten worse I mean it is louder since putting the car away in October. I removed the clutch fan and went to electrics so now I hear everything even clearer which makes it seem louder. People have the valve covers off once a week? For what purpose? U don't have to touch the valves for thousands of miles. Any idea if it is just the guides or the tensioner? I know it isnt valves. They're all gapped fine and the noise is from the front cover. Could the sound be from a failing water pump or the bearing? Again, it could be any of those things. I can't hear the noise from here and you don't seem to want to look. Is the chain loose? Quote Link to comment Share on other sites More sharing options...
NewZed Posted January 16, 2017 Share Posted January 16, 2017 I know it isnt valves. They're all gapped fine and the noise is from the front cover. Could the sound be from a failing water pump or the bearing? Those gaps are usually called lash. It could be the water pump bearing. It could also be the AC belt idler bearing. Could be that your timing chain sprocket bolt is loose. An anti-rattle spring could have broken. One of your lash pads might have popped out, that's not common, but it's not uncommon either. You might have a cam lobe wearing down also. Could be an exhaust leak, they sound like rattles sometimes. Quote Link to comment Share on other sites More sharing options...
280znewbie Posted January 16, 2017 Author Share Posted January 16, 2017 Actually got out in the garage after work. For anyone who might read this in the future with similar issues, undo the water pump belt and run the car. My bearing was shot. New pump tomorrow, all noise is gone. Quote Link to comment Share on other sites More sharing options...
dmoralesbello Posted January 17, 2017 Share Posted January 17, 2017 Good fix. Thanks for posting. Quote Link to comment Share on other sites More sharing options...
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