Probably
Engine tappets
that means you need more oil. it could also be a sticky lifter or slightly bent push rod or even the tappets out of adjustment
The tappets may need adjustment or replacement, due to wear.
To fix tappet noise on a Peugeot Partner van, start by checking the engine oil level and quality, as low or dirty oil can cause insufficient lubrication. If the oil is fine, inspect the valve clearance and adjust it if necessary, as incorrect clearance can lead to noise. Additionally, consider replacing worn tappets or lifters, as they may not be functioning properly. If the noise persists, consulting a mechanic for a thorough diagnosis may be necessary.
try an engine flush at the next oil change, but it will most probably require replacement hydraulic lifters (tappets)
Noisy tappets on the Rover 75 1800 petrol engine typically indicate a need for adjustment or maintenance rather than a simple reset. These hydraulic tappets can become noisy due to wear, low oil pressure, or dirt buildup. It’s advisable to check the oil level and quality first, and if the noise persists, a more thorough inspection or replacement of the tappets may be necessary. Regular maintenance can help prevent this issue from recurring.
Sticking tappets often produce a distinct ticking or tapping noise that can be heard coming from the engine. This sound is usually more pronounced at idle and may become louder or more irregular during acceleration. The noise is typically due to insufficient lubrication or worn components, leading to a lack of proper clearance between the tappet and the valve. If left unaddressed, this can result in increased engine wear or damage.
Engine running hotter then 220 degrees can cause valvetrain noise. Bad fuel can also cause valve noise / PINGING sound. Ignition timing to high / Advanced to far, can also cause engine noise.
A bad harmonic balancer can cause a knocking noise. The harmonic balancer doesn't actually produce the noise, but it can cause the noise in the engine.
cold engine
No
A bad compressor belt can cause a whistling noise while running the air conditioner. A bad engine can also cause this noise.