M111 Engine and Ticking "Whiring" - 2.0 16v DOHC

[justinbaker]

Hello all,

I have just purchased a Vito 113. It has a 1998cc M111 Engine that today I started to strip ancillaries off to find the cure to a "Whir
ing noise", and a constant tapping sound on the top of the engine.

I suspected the tapping to be a worn camshaft, but after taking the rocker box off the cams look like new, bearing in mind this has done 96k they are unworn. If anyone would like pictures feel free to email me.

Anyhow so I need to locate this tapping, and the next area to look is the "tappets" or cam followers isn’t it?

Is there any way to find the culprit in the bank of 16?

Also more alarming is "whirring noise", its not anything external ancillary as I removed the belt and ran it for a few seconds.

This totally bemuses me, I am quite practical and although this noise seems to be coming from the crank area / timing chain, could this be an over tightened chain, it feels with fingers right?

Lastly (sorry to go on) where on the internet is there a manual for this engine, it’s surely quite a common, and from what I can see they are nicely engineered.


Many thanks... Justin

[loose cannon]

check if it has a camshaft advance unit as could well be the culprit

[pentoman]

Try the forum at www.mercedesshop.com for this sort of technical information, very knowledgeable guys there.

I have heard people say before the M111 was not so great, but what do I know eh?

[event horizon]

Sounds like the cam chain is overtightened, the adjuster is at the back of the engine and is a b*****d to get to. Its automatic and uses a plunger and spring system to adjust it. Unfortunately these are almost impossible to get back in, so many people push the plunger through and wind the assembly back in. This results in the chain being overtightened.