M20B25 - weird noise at low revs

[joeyb]

Hi all,

Any ideas what the noise is at 1:15 in the vid, most audible when the revs drop?

[Speedtouch]

Most likely a failing water pump or alternator bearing, possibly also cambelt tensioner bearing or anything else within that rotating mass of gubbins on the front of the engine.

Try using a length of wooden dowel, broom handle or even hosepipe to probe the various areas, as a stethoscope held to your ear, to narrow down the specific area it's coming from...

[dot]

Had a very similar noise myself recently turned out to be water pump

[paultv]

Sounds like my water pump did as well.

Take the belt off, run the engine for 10 seconds - quiet?

Paul