Hello,

So I am now in possession of a W123 parts car which has a knocking sound in the engine. I do nto have much experience with knocking, so I'm looking for some advice on tracking it down and seeing how I can possibly quiet it down. My objective is probably not to save the engine, but just be able to move it around for parking reasons in my street or driveway.

I have heard talk that sometime knock can be do to an injector, a spun bearing, or a "rod".... I'm wondering where I can efficiently start to narrow it down. If it's any of these, would finding the associated cylinder and loosening up the injector quiet down the racket, or reduce further damange rate to the engine when run like this?

Any tips or tutorials on the ways of knocking sounds would be much appreciated. I'm afraid to say that I don't even know what a "rod" is...

Thanks.