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Old 05-18-2005, 04:02 PM   #1
76bonanza
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bad sound

I just changed my oil drove it checked for leaks hear a knocking sound by were the engine and tranny join together. Can only hear it good when engine idels above idle can not hear but could be because of engine noise. I seem to think this same thing happened last time I changed my oil for like a week?

Any thoughts

Thanks guys
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Old 05-18-2005, 04:29 PM   #2
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hmmm if youre lucky its a flex plate if youre not it could be the motor bearings
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Old 05-18-2005, 05:00 PM   #3
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with my stethascope if I put it on the oil pan I dont hear it but if I put it on the bell housing I do hear it. Any reason it would do it when I change my oil or is that just considense?(spelling bad)
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Old 05-18-2005, 05:09 PM   #4
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you have an oil passage stopped up some were
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Old 05-18-2005, 08:38 PM   #5
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im willing to bet its the flex plate.. if an oil passage were blocked everytime the truck sat where the oil drained out of the passage it would still bang. keep checking the noise its prolly still there the rest of the time
if you want you could do a motor flush to rule out the blocked oil passage
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Old 05-18-2005, 08:46 PM   #6
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if it is a flex plate what would that mean it is loose needs replacing?
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Old 05-18-2005, 10:35 PM   #7
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the flex plate is like a flywheel if its cracked ( thats what makes the noise) its got to be replaced and thats about $50-70 at your local auto parts store the thing is you have to remove the trans or at the very least support it and slide it forward under the body so that you could get to the flex plate
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Old 05-19-2005, 12:22 AM   #8
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I just changed my oil drove it checked for leaks hear a knocking sound by were the engine and tranny join together. Can only hear it good when engine idels above idle can not hear but could be because of engine noise. I seem to think this same thing happened last time I changed my oil for like a week?

so if it was the flex plate in my opioion it will be all the time idle and off idle
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Old 05-19-2005, 06:12 PM   #9
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Do you think it could just be louder because the new oil is thiner and just seems louder with the new oil?
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Old 05-19-2005, 07:18 PM   #10
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Also it is my daily driver and I have no money or time at this point should I be very concerned or mildly concerned?
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Old 05-19-2005, 07:29 PM   #11
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But why would it quit after the oil has been in the engine for a week? Then start up again when he changes oil again. Does not make since (to me any way)
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Old 05-20-2005, 10:16 AM   #12
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what oil ur runnin if its a higher grade is because the oil is thick and after awhile it thins but the thick oil takes awhile to get thru the motor if there is restrictions in it my motor i pulled out of my truck had 340,000 miles and it had like oil that was in there for ever that turned in to chunks of stuff but the motor never smoked it used ail because of bad seals but it ran damn good till i spun a rod bearing but it was a factory ls6 motor
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Old 05-20-2005, 04:01 PM   #13
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I am running 15 40 castrol synth blend. it is what the previous owner ran for 10 years so I stuck with it.
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Old 05-20-2005, 05:53 PM   #14
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unless its really hot where you live ...i'd run 10w30 or 40 ... do you fill the oil filter before you put it up in the engine ??
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Old 05-20-2005, 06:19 PM   #15
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yes I do. He was runnin 20w50 and I went back to 15w40
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Old 05-20-2005, 07:23 PM   #16
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use 15-50 mystik, it's pretty thick, and it might help the noise go away, that might help, maybe for now
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Old 05-20-2005, 07:29 PM   #17
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what is mystik? never heard of it.
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Old 05-20-2005, 07:36 PM   #18
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This is to WEIRD!! I noticed the same thing last weekend when I changed my oil. I had a friend look at mine and he said it was a loose torque convertor since the sound went away when I put it in reverse. You might give that a try.

edit: I think I noticed it during the oil change just because I pulled my truck into the garage , so there was more echo. So it didn't really have anything to do with the oil.
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Old 05-20-2005, 07:41 PM   #19
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it's a motor oil, i think you should be able to get it at your local auto parts store
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Old 05-21-2005, 02:13 AM   #20
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im runnin 50w vaoline racin oil in my truck my dads dualyl my moms burb my dads hot rod and show truck thats the oil we have been usin for many years and it seem to work good
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Old 05-21-2005, 02:14 AM   #21
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its motor honey really really thinck stuff
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Old 05-23-2005, 06:50 PM   #22
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One other thing if I warm it up in park and dont run it no sound only after driving around for a while.
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