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c250td engine tick question

Crack the injector unions with the engine idling. Do each one in turn.
 
deian said:
Anyway, I guess we should close this thread, unless anyone has any final words?
Thanks to all who contributed.
Click to expand...


Please report back and let us know the result as it will help others looking at this problem to come to a speedy diagnosis.

:)
 
E270 Owner said:
Please report back and let us know the result as it will help others looking at this problem to come to a speedy diagnosis.

:)
Click to expand...

I will, I'll have a proper look at it this weekend and report back.
91dm: Nothing on that video sounds familiar, that sounds better than mine. Sadly. :wallbash:
 
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deian said:
I will, I'll have a proper look at it this weekend and report back.
Click to expand...

Tip:
Stick your head in/near the off side wheel arch you will hear it knocking a lot louder than from the top of the engine ;)
 
Can't say there's a knocking sound as such by the wheel arch, it's pretty much the same all round, it's just a little louder by the wheel arch because the noise travels outwards.
Now that she's fixed, I'll do a HD video tomorrow should have decent sound quality.
 
deian said:
Can't say there's a knocking sound as such by the wheel arch, it's pretty much the same all round, it's just a little louder by the wheel arch because the noise travels outwards.
Now that she's fixed, I'll do a HD video tomorrow should have decent sound quality.
Click to expand...

Dieselman said:
Fixed. What was the fix?
Click to expand...

He means the fuel line problem in another thread is fixed not the piston slap.
 
E270 Owner said:
He means the fuel line problem in another thread is fixed not the piston slap.
Click to expand...

Yes.

So what does piston slap actually mean?
Is it the pistons shaking about because the rings are worn?
Or are the pistons going so high that they hit the valves (this sounds wrong and out of time), which could be the issue?

Is it anything to do with big end bearings?
(I know how engines work but not enough to diagnose any specific terms that I am unsure of).

Heard thicker oil can help.

That noise is getting worse. The video? I will do one as soon as I get a chance, I have exams on the way soon (2nd yr uni).

Other than that I hope its the injectors. Which leads me to the question, where can I get a socket to get the injectors out, might get them cleaned, after cracking the unions.

Also 91db, where was that timing cog located that had the blocked oil channel again? I'm gonna hunt that one down before thinking of an engine rebuild. I might just buy a spare engine, rebuild that first, then swap this one out and rebuild it before selling it on.

Other than that, it's all I have to go for at the moment. I am sure it's more of a timing issue because of that blocked oil channel in the cog, it's pinking under load (i know pinking from petrol engines (vauxhall), didn't know it happened on diesels).

Enough from me.
 
NEW video

So as promised, here is the new video for forum diagnosing of my bag of nuts.

[YOUTUBE HD]C250td knocking? - YouTube[/YOUTUBE HD]

Not sure if the youtubehd video tag works, although it's working from the direct link.
C250td knocking? - YouTube

What do u all think, the same?
And any answer re:above post?
I also opened all but 1 injector and nothing major changes except for the fact that it runs on 4 cylinders, and sounds slower lol. Is it safe to crack the one under oil breather things open without it?
 
Is the belt damper worn?

It's difficult to hear but I tell you something it's not. Piston slap.
 
Have you bought a stethoscope yet?

On another brand of car, I've known an alternator sound like big ends gone due to noise transfer.
 
From the video that sounds almost the same as mine sounded after I had the injector's recondition. Although once up to the temp the noise usually was quiet at idle, but still noisy at 1200rpm.

Did you notice any difference after the tank of diesel with the injector cleaner?

To answer your earlier question, the injector sprocket is behind the vac pump and the pump has to be removed to change it.
 
Hi, thanks for the ongoing replies.

I also don't think it's piston slap, so your words are nice to hear BlackC55, easy to think it is. When I start it from complete cold, it has only 4 functioning glow plugs, so it's a bit rough, and the ticking doesn't kick in until a few seconds after it settles onto 5 cyls.

So it will need further investigation, I think I can eliminate dirty injectors too (except maybe for that one I couldn't get to).

Unless it's that dodgy glow plug that isn't well sealed cos the mechanic didn't want to overtighten it.

The cleaner didn't do any difference to the noise, I guess the inectors are cleaner too.

So I need to look at the alternator and belt damper next, failing them that sproket behind the vacuum pump, wherever that is, is it a big job, will I need any new parts such as seals just to open things up, any special tools?

Again, guys I am thankful. I'm onto the mechanics stethoscope now, ebay job I think.
 
Hi

I have listened and think you are worrying about nothing, the noise of these engines changes depending on the quality of fuel and even engine temperature.

Drive away at her, drive it like you stole it, take her to within an inch of her life and she will still keep going.:D

604,5&6's rock and keep going and going and going.

If you want her running a bit quieter but a litre or 2 of veg oil into her as she is ticking over with the fuel light on. You will hear her quieten down as you pour
it in. Honestly it works. Lidl £1.40 a litre stuff

Most of all drive her and pile the miles high, that's what they are for:D

230K
 
This is what I do, I rob a bank everyday (jk). I bought it for the fact that they are (apparently) solid engines, when I bought it wasn't like this, then I robbed a bank (so to say) and that has identified a weakness somewhere.
It has 180k, and I just want to know what causes it in case it's something that will make it cause it to fail, I think it should be quieter.
So it can take veggie oil with no mods and no long term issues?
My old xantia ran on veggie oil (only the bosch pumps mind).
 
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On the rare occasion you actually rev it up quickly and let it fall back to idle properly, that sounds like combustion rattle.

You didn't do as asked, so it's difficult to tell.

Sorry to be blunt, but we could have closed this thread pages ago with better feedback.
 
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