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Knocking Sound

GTS-070

By GTS-070,
in General Maintenance

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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

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GTS-070 Enthusiast

GTS-070

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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...

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Duncan Grand Master

Duncan

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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)

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GTS-070 Enthusiast

GTS-070

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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

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