Engine Rattle During Acceleration
07-16-2023, 07:34 PM
#61
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I had the same problem, on multiple SS motors. Broken chain guides with little mileage after a timing set replacement. I pulled the cam tensioner apart and they were both broken. Since one was Cloyes and the other was ACDelco, I was a bit miffed. I purchased 2 new ACDelco tensioners and installed 1. For grins, before I ran the engine, I thought I'd pull the tensioner, to make sure my "pop" on it was sufficient to activate it. Low and behold, it was already broken... Come to find out my "pop" was stronger than the required activation "pop" and I was damaging the internals of the tensioner. So, instead of adjusting my pop strength, I just installed the tensioner activated already. It was easy, just had to place a small socket inside my tensioner socket so I could push in the tensioner enough to start the threads. Problem is now solved and both engines are running great.
Robert
Robert
07-20-2023, 05:44 AM
#64
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Folks, thanks, but I'm 1000% sure it is not an exhaust rattle. I know some folks suggested that earlier in the thread, but I've shared the latest with you to clearly indicate the chain is loose.
I bought a new GM tensioner and am going to try it. For whatever it's worth, my Cloyes tensioner came in a box that said "made in China." The GM tensioner says "made in Slovakia," which I assume is of better quality, since I never hear of Slovakia in the same context as China. I asked Cloyes last year about the "made in China" sticker. They said, "yah the parts are made in China, but under American supervision." At the time, it wasn't very reassuring, but I took the chance anyways. I think we will soon learn if the Cloyes tensioner is substandard.
I bought a new GM tensioner and am going to try it. For whatever it's worth, my Cloyes tensioner came in a box that said "made in China." The GM tensioner says "made in Slovakia," which I assume is of better quality, since I never hear of Slovakia in the same context as China. I asked Cloyes last year about the "made in China" sticker. They said, "yah the parts are made in China, but under American supervision." At the time, it wasn't very reassuring, but I took the chance anyways. I think we will soon learn if the Cloyes tensioner is substandard.
07-24-2023, 05:45 AM
#66
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UPDATE: I purchased a new AC Delco tensioner. On the bench, I disassembled the old Cloyes tensioner as well as the new AC Delco tensioner. Nothing was broken inside the Cloyes tensioner. The design and method of construction looked to be the same between them. As mentioned earlier, the Cloyes component is made in China, while the AC Delco component is made in Slovakia. The cold startup rattle seems to have disappeared. I'll drive it for a while and see what happens.
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