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Matt
Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 21864
Experience:  BEng hons Mech engineering, in auto industry 22 years
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screeching noise from front of engine , usual suspects checked

Customer Question

screeching noise from front of engine , usual suspects checked ie altenator /pulleys /belts replaced water pump ,still noise persists
can you please help
Submitted: 2 years ago.
Category: Car
Expert:  Matt replied 2 years ago.
Hello

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.