Jump to content
SAU Community

Knocking Sound

GTS-070

By GTS-070,
in General Maintenance

 Share

Recommended Posts

GTS-070 Enthusiast

GTS-070

Posted
Posted

Hey guys, long time browser of these forums and wondering if I could now get some help. The car is a 1994 r32 GTR.

Not so long ago my car began making this dreaded knocking sound that I have read about over and over again. I read many threads regarding the likelihood of this sound meaning the car had spun a bearing (or was in the midst of), listened to a couple .wav samples of spun bearings and the sound my car was making is exactly the same. The car was still running and would drive fine, however I stopped driving it. I had accepted that I had spun a bearing (and the money i was about to spend)

Anyway today i cut the belts off one by one to make sure and once I cut the alternator belt, the knocking sound seems to have disappeared.

Basically what I want to know is does this pretty much mean that my car IS NOT about to spin a bearing, or can the fact that there is no more load (?) on the balancer mean that it wont make that knocking sound.

ANY ENLIGHTENMENT/HELP APPRECIATED

Cheers

Dale

Link to comment
https://www.sau.com.au/forums/topic/185974-knocking-sound/
Share on other sites
D_I_F Grand Master

D_I_F

Posted
Posted

depends where the nocking noise is coming from it could be a number of things,

wheel bearing, Worn out uppercontrol arm bearings or thrust bearings.. take it to a mechanic and have them to have a listen.

Link to comment
https://www.sau.com.au/forums/topic/185974-knocking-sound/#findComment-3364732
Share on other sites
GTS-070 Enthusiast

GTS-070

Posted
  • Author
Posted
depends where the nocking noise is coming from it could be a number of things,

wheel bearing, Worn out uppercontrol arm bearings or thrust bearings.. take it to a mechanic and have them to have a listen.

sorry should have been more specific. the noise could be heard at idle and sounded like it was coming from the bottom of the engine, which rules out those possibilities...

Link to comment
https://www.sau.com.au/forums/topic/185974-knocking-sound/#findComment-3366167
Share on other sites
Duncan Grand Master

Duncan

Posted
Posted

well the clutch fan or bearing on the alternator *could* be shot. How long did you run it after removing the belt (make sure it doesn't run hot because water pump wont be running). if you give it a rev does the knocking come back (big end bearings get noisier with revs while mains are about the same loundess regardless of revs)

Link to comment
https://www.sau.com.au/forums/topic/185974-knocking-sound/#findComment-3366279
Share on other sites
GTS-070 Enthusiast

GTS-070

Posted
  • Author
Posted
well the clutch fan or bearing on the alternator *could* be shot. How long did you run it after removing the belt (make sure it doesn't run hot because water pump wont be running). if you give it a rev does the knocking come back (big end bearings get noisier with revs while mains are about the same loundess regardless of revs)

the sound only disappeared after i removed the alternator belt. when the sound was present it did increase with revs.

thanks

dale

Link to comment
https://www.sau.com.au/forums/topic/185974-knocking-sound/#findComment-3367419
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • silviaz
      Steps to DIY sanding car back ready for respray....

      By silviaz · Posted

      Yep will do, thanks for all the help.
    • itsforandres
      BCNR33 Blower Motor Resistor - Testing

      By itsforandres · Posted

      @dbm7 and @GTSBoy thank you both very much! will give that a shot!
    • Murray_Calavera
      Steps to DIY sanding car back ready for respray....

      By Murray_Calavera · Posted

      Sounds good. Provided the panel is flat/level I'd be happy to start the painting process.  While you are learning, for sure you could do this. Its only paint, you can always sand it all back and start again. Its only your time and money on materials, but while you're learning, really its time and money spent on your education.  Once you know how to do this bodywork and painting, you won't want to waste your time and money on frivolous activities lol. 
    • silviaz
      Steps to DIY sanding car back ready for respray....

      By silviaz · Posted

      Yep I will use a guide coat after putting filler, I will do it on the whole panel as I'm a beginner so chances I've made quite a few errors. In that photo, I think that was a low spot, I just for example said to pretend it's flat but I will put filler + guide coat after to assess where I'm at. Yep with that picture, the panel is wet as it rained when I took the photo. But all those scratches are completely smooth, I went over it with 240 grit and can't feel it, even with my nail digging into it. I was legit thinking to buy a 2k can and spray primer to see how it turns out but then thought to myself it's going to be a mess doing it haha. Good mention there. Thanks for all that info I think I know what to do next.
    • Murray_Calavera
      Steps to DIY sanding car back ready for respray....

      By Murray_Calavera · Posted

      Prior to laying down the primer, you need to make sure the surface is completely level. For example, based on this picture, I strongly suspect that the areas marked in blue are higher then the area marked in green.  If you spray primer over this entire area, then paint and clear it, the finished result will 100% show the low area. It will stick out like dogs balls. Unfortunately the paint won't magically level out the low areas as you lay it down.  Without seeing it in person, I expect that the green area will need to be filled, then use a guide coat and check that the entire repair area is level with a large sanding block.  With this picture, are you saying that even though you can see the scratches, the panel is in fact completely smooth and flat? If this is the case sure you could prep and paint it as it is.     The picture with the paint you described as blistering, it's hard for me to comment on from the photo alone. It looks like the panel is wet? Dunno, looks strange. Does the panel feel as smooth as glass when you run your hand over it? **** Going back to your question again, generally you would only sand the primer if you made a mistake while laying down the primer.  If the panel is prepped properly and you lay the primer down properly, you should not need to sand the primer.  This wouldn't work - Don't prep the panel. Spray primer and see how it turns out. Sand the areas where the issues appear. Spray more primer and see how it turns out. Sand the areas....... Yeah you'd go round and round in circles getting no where. 
×
×
  • Create New...