2002 Renault Laguna Rumbling/whirring from engine

2002 RENAULT LAGUNA
105,000 MILES • 4 CYL • FWD • AUTOMATIC
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RK02DHO16SB
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Engine is 1.8ltr petrol with cam belt changed at 72000 miles. Engine started squeaking (as if water pump starting to fail) about 100 miles ago, now turned into constant whirring/rumbling that escalates with engine speed, also some engine vibration when stationary with engine running and in drive. Noise fades or stops over 50 mph. Engine does not overheat, misfire, lose power when running.
What may be going wrong? Where do I start looking?
Mar 9, 2010 at 5:18 AM
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DAVE H
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start by checking belt tensioner and all pulley's on alternator belt and cam belt !
Mar 12, 2010 at 4:39 AM
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RK02DHO16SB
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Dave H - you were on right track. It was the alternator bearing that had collapsed. Fixed by replacing unit.
May 11, 2010 at 7:44 AM
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DAVE H
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Thanks for sharing your final fix .. glad to be of assistance .. please use our forum again in the future should the need arise, and spread the word of our forum to family and friends etc. Happy motoring.


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May 12, 2010 at 3:39 AM