2007 Mazda RX8 Strange Sound coming from front

2007 MAZDA RX8
55,000 MILES • 1.3L • 4 CYL • RWD • MANUAL
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TAUQEER81
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Today, i drove my car and notice a continuous "Crrrrrrrrrrrrr" sound COMING FROM FRONT when car is moving ( Note : No sound at idle. Me and mechanic ran few tests and here they are:

1) We started the car and when car starts to move, ticking/clicking started at a continuous theme and when car starts to slows down that clicking/ticking stopped.

2) We put the car in neutral while driving and the sound was still there and again in neutral we stopped the car gradually and the sound went away at stationary position.

So we though, maybe its coming from Engine or gear.

3) While driving we shut the engine off and also depressed the clutch but that clicking/Ticking was still coming from front and when car starts to rest, again sound disappeared.

So now, even when the engine is off and transmission is free, the noise the coming from front and mechanic told me that it could be the bearing which can some time makes Cliking/ticking continuous sound when they start to go bad. The car is rear wheel as you all know so only the tires at front are moving only when car is shut off during driving. Is my mechanic diagnosing it well? if not then what else would be the cause of that strange clicking/ticking sound?

We ruled out exhaust leak due the test mode we did with the car shutoff at 30 miles. and i believe the only moving parts with engine off at the front is tires and bearings.

Did the re-torquing on all four wheels. Problems remains the same. To be more clear the sound is a regular " Crrrrrrrrrrrrrr" during driving slow or fast ( same sound speed) even when the engine is shut off during mobility. Need help. I also checked the safety plates behind the wheels whether they are making this sound but safety plates are not touching brake plates.
Apr 28, 2015 at 5:28 AM
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CADIEMAN
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TRY REMOVING THE FRONT BRAKE PADS AND PUT STOP SQUEEL ON THEM.
Apr 28, 2015 at 6:33 AM
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TAUQEER81
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Kindly mention on layman terms how to do it.. thanks
Apr 28, 2015 at 7:27 AM
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CADIEMAN
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i don't know the noise you are tring to explain.but the brake pads can make a screaching noise when the caris in motion.they maybe bad ck. them.
Apr 28, 2015 at 9:41 AM
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TAUQEER81
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Okay, to be more clear, it is not the sound of brake pads squeaking.

When i drive the car and reach at 30 or 40 miles per hour, basically i shut the car off by key and let it run on its own. Even then i can hear the continuous sound Just like Tappets sound in piston engine. so its basically continuous " Currrr, Currr, Currrr like a tappet sound.
Apr 28, 2015 at 9:47 AM
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CADIEMAN
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ANY CONSTANT TAPPET NOISES ARE NOT GOOD BUT I WOULD TRY AND FIND A MECHANIC TO HELP U IT COULD BE A INTERNAL ENGINE PROBLEM SO DON'T DELAY.
Apr 28, 2015 at 10:56 AM