Mazda Repair Questions? Ask Mechanics for Answers ASAP
I'd first try removing the auxiliary drive belt and turning every pulley and ancillary ( power steering pump , alternator etc) by hand. All should turn easily (with the exception of the AC pump) with no grittyness or wobbly pulleys- If you do find a sticky pump / alternator then it should be replaced or repaired
If the engine is stone cold you can briefly run it with no belts to see if the noise changes or has gone away, this will help show if an ancillary is the issue
Examine carefully the condition of the bottom / crank pulley as these are composite construction with a rubber element and its possible this rubber is breaking up and allowing the two metal portions to move.
ok thanks for highlighting that
in that case I'd say that this could be a faulty clutch release bearing?
if the noise changes when you press the clutch pedal then this would bear this out
sorry to say that the transmission will have to be removed as the next step
Ok in that case I'd check over the propshaft for wear
you can easily check for for any slack in the propshaft joints by twisting either half by hand and feeling for any play as there should be virtually none
the centre bearing is quite loosely mounted so this can be moved normally but if you can run the car in gear with the wheels off the ground and then feel the centre bearing housing for vibration if there's any then consider replacing the unit
and then look along the propshaft for any signs of a missing balance weight as these take the form of little 3/4" squares that are welded onto the shaft - as they are only tacked on they can sometimes come loose and be lost resulting in the shaft being out of balance - if a joint is worn this can also shake them loose
so if a joint is replaced its good practice to have the shaft re-balanced afterwards
do you still need help?
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just get back to me on this post with your other questions