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Perkins 4108 Again

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Do you mean a whirring type noise? I would do the old screwdriver stethescope trick to listen for where it's coming from.Engine running, get a long screwdriver, stick the handle to your ear and the tip onto the body of any spinning items(alternator/water pump etc). The same noise will be amplified into your ear if you find the culprit.

Be careful of course, make sure the tip doesn't touch the spinning bits or short any electrical connections....etc

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Take the fan belt/s off and then run the engine briefly. If the noise has stopped you know it's a belt driven part that's failed. If the noise is still there its something more internal.

If it's a belt driven part that's making the noise you'll normally be able to identify the culprit by spinning each one by hand.

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