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4th Gen ('81-'88): Engine Knocking noise, need suggestions

  #1  
Old 05-21-2016, 11:21 AM
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Default Engine Knocking noise, need suggestions

Currently am facing two problems on the engine that I would like to solve before finishing the body work just in case I need to pull it out.

1. Water pump squealing. Not a big issue.
2. Metal on metal knocking noise. Cant describe it enough in words so I made a video.

Video: https://www.dropbox.com/s/edcogosmyn...12.18.mov?dl=0

Sorry about the squealing. It stops a few seconds into the video.

Suggestions?
 

Last edited by Jake Long; 05-21-2016 at 11:53 AM.
  #2  
Old 05-21-2016, 02:00 PM
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Just looked at the flexplate from what I cant see that its cracked. I don't feel any vibrations from it when trying to move it with my hands. I think I may rule it out. The sound doesn't seem to follow a pattern. From what I have heard, cracked flex plates produce the same exact noise the whole time the engine is running. Mine seems to have louder and quieter knocks.
 

Last edited by Jake Long; 05-21-2016 at 02:13 PM.
  #3  
Old 05-21-2016, 03:19 PM
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Originally Posted by Jake Long View Post
Just looked at the flexplate from what I cant see that its cracked. I don't feel any vibrations from it when trying to move it with my hands. I think I may rule it out. The sound doesn't seem to follow a pattern. From what I have heard, cracked flex plates produce the same exact noise the whole time the engine is running. Mine seems to have louder and quieter knocks.
Did you pull the valve covers an look at the rocker arms ?
 
  #4  
Old 05-21-2016, 03:48 PM
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Are you sure the knocking is not from the fan blade with a bad bearing?
 
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Old 05-21-2016, 04:43 PM
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Originally Posted by zjerry View Post
Did you pull the valve covers an look at the rocker arms ?
I did not since it sounds like its coming from behind the motor. Will take them off and check.

Originally Posted by plumbob View Post
Are you sure the knocking is not from the fan blade with a bad bearing?
Yes. After making the video I took off all the belts and ran it without the belts. Squeal is gone, but the knocking was left.
 
  #6  
Old 05-22-2016, 07:57 PM
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Decided to pour out the oil.Super shiny. Never seen oil this shiny. As if someone emptied glitter into it. Rod bearings? What do you guys think?
 
  #7  
Old 05-22-2016, 08:21 PM
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sounds like a spun bearing...... doesn't sound good...eeeeeek
 

Last edited by sharpeezss; 05-22-2016 at 08:26 PM.
  #8  
Old 05-22-2016, 09:13 PM
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but here is another thing thats bugging me. Its not a consistent knock. At lower revs the knock is almost none existent. At higher revs its there, but quieter than when idling.
 
  #9  
Old 05-22-2016, 09:41 PM
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Originally Posted by Jake Long View Post
but here is another thing thats bugging me. Its not a consistent knock. At lower revs the knock is almost none existent. At higher revs its there, but quieter than when idling.


yes I know rod knocks are usually consistent. maybe the higher oil pressure is quieting it down a bit?? any exhaust leaks?
 

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