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Engine Knocking Noise Rb25det

5ky

By 5ky,
in General Maintenance

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5ky Proficient

5ky

Posted
Posted (edited)

there is a strange loud knocking noise coming from around the engine, the more u rev it, the louder it gets, it sounds like metal tapping against each other, car seems to drive fine and idles normal and doesnt blow any smoke.... the noise is gettin worse and worse, gets louder each time i drive it or thrash it

its a 94 r33 gtst rb25det

it also knocks when on idle and not reving

is it my bottom end gone? needs a rebuild?

Edited by 5ky
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hayden49 Rising Star

hayden49

Posted
Posted

Wouldnt be the noise of the timing belt on the way out?

mine makes kind of a DDD D D D D D D D noise at low revs, im currently getting the parts for the 100k service and hopefully this should fix the problem.

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SECURITY Grand Master

SECURITY

Posted
Posted

to confirm where the noise is coming from you can get a stethescope and put it up against your block or head to find out for sure (your mechanic will know where its coming from anyway).

it could be your bottom end or it could be a dodgy lifter, but from what you're explaining it sounds to be your bottom end :action-smiley-069:

time for a regrind.

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  • 4 years later...
Spurdo Experienced

Spurdo

Posted
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another possibility could be the ball bearings in your alternator. will have no effect on the driveability of the car. mine did this once. when they come loose they make a hell of noise flying around inside the alternator and will soon kill your alternator altogether and battery goes flat and engine stops. just a possibility

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  • 2 years later...
NSM033 Enthusiast

NSM033

Posted
Posted

Mine's doing the exact same thing, 99% sure the noise is coming from the intake cam area. been told it may be a lifter as the car still drives well so wouldn't have thought it would be a valve spring or valve, but any advice identifying the problem would be greatly appreciated.

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Chris32 Veteran

Chris32

Posted
Posted

Another possibility is the bearing on the viscous clutch for the fan. See if the fan has play in it.

I just put a s/h one on my car and the bearing was stuffed, it sounded really bad. If I hadn't had just put it on, I would have thought I'd done a big end bearing!

You could wobble the fan a few mm side to side.

Replaced with another unit and it's silent now!

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