Insignia CDTI 130 engine knocking

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Hi all I have recently bought a project insignia, it drives absolutely fine but has a rattle knocking sound coming from somewhere in the engine bay, I’ve had a few different ideas thrown my way one being the DMF, possible injector leak, servicing due and pulley bearings (unspecified) 

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Hi....welcome to the Forum

I would first start with removing the auxiliary drivebelts and run the engine for a very short period to see if the noise disappears.

Sometimes a crankshaft pulley that is breaking up can give this sort of noise and is a very simple and cheap fix.

If not, then refit them and nothing lost....then time to move onto the bottom end.

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