Why does my engine make a ticking noise?

Usually a top-end issue — sticking hydraulic lifter, low oil level, worn camshaft, or an exhaust manifold gasket leak that sounds metallic on cold start.

Here's a quick, honest answer from a working UK mechanic — what causes it, what it costs to fix, and what to do next.

Is ticking serious? — Sometimes yes. A persistent metallic tick can mean valve train wear that turns into bigger damage if ignored.

Could it be an injector? — Yes — diesels normally tick from injectors. A loud knock from one cylinder means a failing injector that needs urgent attention.

Bob's Mechanical Repairs — independent family-run garage in Birnam, Dunkeld, Perthshire. Call 01350 727 276 or email [email protected].