Knocking noise at idle - Page 3

PTJS · Mar 28th, 2011, 10:56

Thanks Clifford

I usually do an annual oil and filter change about now so given your experience I'll try 20/50 this time round and see if it keeps the rattles away. I only do around 5k a year so it will be an interesting exercise to see if it keeps it quiet for a full year.

Cheers

Phil

mikealder · Mar 28th, 2011, 11:04

Is the cooling fan on a viscous coupling? if so check thats not worn causing it to woble at low RPM, slightly higher RPM and the centrifugal force will stablize the fan thus leading to no knocking, only seen this once on a 245 years ago, it took ages to locate the noise but changing the fan coupling got rid of the problem - Mike

Mar 28th, 2011, 10:56	#21
PTJS Master Member Last Online: Aug 22nd, 2022 17:32 Join Date: Jun 2006 Location: Derby	Thanks Clifford I usually do an annual oil and filter change about now so given your experience I'll try 20/50 this time round and see if it keeps the rattles away. I only do around 5k a year so it will be an interesting exercise to see if it keeps it quiet for a full year. Cheers Phil

Mar 28th, 2011, 11:04	#22
mikealder VOC Member Last Online: Nov 6th, 2016 10:18 Join Date: May 2009 Location: Blackpool UK	Is the cooling fan on a viscous coupling? if so check thats not worn causing it to woble at low RPM, slightly higher RPM and the centrifugal force will stablize the fan thus leading to no knocking, only seen this once on a 245 years ago, it took ages to locate the noise but changing the fan coupling got rid of the problem - Mike

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