A140 top end engine knock

[Andy730]

Hi, thanks for looking at what is my first real plea for help on this forum.

My Partners 2001 A140L has developed what sounds like a top end knock, or rattle of some sort, but it comes and goes, and bit like it's getting a partial but regular oil feed.. (or rather regular oil starvation?) BUT, what is it??

It's said a picture is worth a thousand words, so to help, i have uploaded a video to youtube. PLEASE have a look, and listen to see if you think if this is going to be expensive??

Mercedes A140 engine top end arttle? - YouTube

Thanks for looking,

Andy

 

[Dieselman]

Sticky tappet. Try flushing oil.

 

[Harlowcabbie]

Have you pulled the engine cover off? Sounded like injector leak.

 

[Andy730]

Have you pulled the engine cover off? Sounded like injector leak.

Hi, No, i haven't gone any further that a simple oil & filter change (that made very little difference..

I'll be honest, i've never heard a injector leak, so can't say either way.

from the previous comment (thank you!) i shall try the easy option first, that being flushing oil, then yet more new oil & another filter..

Thanks to you both for your comments

 

[Dieselman]

Have you pulled the engine cover off? Sounded like injector leak.

On a petrol engine?

 

[Harlowcabbie]

First my error I didn't really read thoroughly just watched the video and think you have to admit it sounds a lot like a diesel. That is one rough sounding engine , although isn't it still possible for a injector to be leaking on a petrol engine as well if the seal has gone?

 

[Howard]

Sticky tappet as DM says.

I had one like it on an old w124 I had , tried flushing oil , didn't clear it . Had the tappets done in the end.

That said , flushing oil does have a good success rate

 

[Andy730]

Sticky tappet as DM says.

I had one like it on an old w124 I had , tried flushing oil , didn't clear it . Had the tappets done in the end.

That said , flushing oil does have a good success rate

Flushing Oil on order, plus new oil & filter.. looks like i have yet another job for the weekend. The A140 is petrol, and has done 66k miles.

Thanks again for the comments, i shall report back when the job is done and if successful or not (fingers crossed)

 

[Andy730]

Well, one flush later and with new oil and filter, the noise is somewhat better, but not 100% quiet. I've read a bit about the qualities and the for/against argument about flushing oil. So, has anyone tried this stuff : Wynn Oil UK

I have to bear in mind that this is a car worth about £1,000, so i'd rather not go down the road of expensive engine work...

 

[Andy730]

Almost one year later... I tried some of that Wynns lifter treatment, my initial thoughts was that it was a waste of money, Wynns + new oil, a few days later and it was still tapping away. Funds dictated that i'd leave it for now to see what happened.

It was about 3 month later i'd noticed that the knock was gone & the engine was now ok again.

So, Wynns, comes highly recommended by me.