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Old 05-16-2004, 12:08 PM
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Question Broken valve spring???

I have a chevy 383 I rebuilt last month because of a few bad cam lobes. Never built an engine from bottom up before. Had the block and heads cleaned up by a machinist reusing the valves. I replaced the cam with the same I took out of her, Edelbrock performer rpm #7102. I reused the roller rockers with new push rods. Made sure to clean both real good before I assembled everything. I changed the oil after the first start up also adjusted valve lash. Drove it around for about 60 miles, changed oil and checked valve lash. After 200 miles on her I changed oil again. At around 300 miles I noticed I had a valve ticking, no big deal I thought. I took off the valve covers and found real fine metal particles under drivers side valve cover also #1 exhaust valve spring broken and bent rod. I drained the oil and removed the filter, ran a magnet through the oil and found nothing. Strained the oil and found nothing. Inspected the driver side lifters and cam lobes, all look good. The only particles I found were on the oil plug and under the cover. So I guess I have two questions. One: is the metal I found under the cover maybe from the spring or normal wear?? Two: what might of been the reason the spring broke? I adjusted valves with engine off but warmed up, I know this in not the preferred method. Could I have adjusted this one too tight?? Any input would be greatly appreciated.

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Old 05-16-2004, 03:23 PM
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1. Anytime you can see metal it isn't normal wear.

2. You could have got it too tight and caused the spring to get too hot from the extended motion. Excessive heat will cause them to get brittle and break.

Larry
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Old 05-16-2004, 03:45 PM
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Since I didn't find metal in the oil pan. Could I just replace the spring, fill it with new oil and keep an eye on it?
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Old 05-16-2004, 03:52 PM
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Go for it. I doubt that the broken valvespring bits were small enough to pass through the oil pump screen and the oil filter. If you didn't find anything in the pan then you should be okay.

Larry
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Old 05-16-2004, 04:53 PM
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Thanks for the info Larry
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Old 05-16-2004, 07:13 PM
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No prob

Larry
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Old 05-16-2004, 09:40 PM
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Sometimes a valve spring just gets fatigued and breaks. The broken ends rubbing together will leave some metal in the oil. Like already posted, drive it.

You might want to check the rest of the springs. a broken spring can drop a valve and destroy an engine.

Troy

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