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  #1  
Old 03-20-2017, 01:31 PM
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Mercedes 300SDL Engine Knocking.

So I purchased a 300SDL and a friend of mind check it out and said it sounds like there is engine knocking coming from the bottom of the engine, rather than the top.

Recent service records show that the diesel injection system and glow plugs were are replaced.

I want to service the car on my own, so what are some areas I check around to see if I can pinpoint the problem.

Thanks.

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  #2  
Old 03-20-2017, 02:09 PM
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There are a lot of common "knocks" that come from the 603 engines. The most common are issues with injection and collapsed valve tappets (lifters).

How bad is this knocking? Can you supply a video or audio sample? The bottom end tends to be pretty tough on these engines, though faults can and do happen. How's your hot (15-20 mins on the highway) oil pressure at idle?
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  #3  
Old 03-20-2017, 02:09 PM
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Also worth checking - vacuum pump on the front of the engine. They're known to self-destruct with potentially catastrophic results. Knocking from that area tends to be an early warning sign.
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  #4  
Old 03-20-2017, 02:39 PM
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Quote:
Originally Posted by Diseasel300 View Post
Also worth checking - vacuum pump on the front of the engine. They're known to self-destruct with potentially catastrophic results. Knocking from that area tends to be an early warning sign.
Quote:
Originally Posted by Diseasel300 View Post
There are a lot of common "knocks" that come from the 603 engines. The most common are issues with injection and collapsed valve tappets (lifters).

How bad is this knocking? Can you supply a video or audio sample? The bottom end tends to be pretty tough on these engines, though faults can and do happen. How's your hot (15-20 mins on the highway) oil pressure at idle?
I will upload a video and test the tappets.

Also, how long do I have to wait for the engine to warm up at idle before moving the air filter pipe and valve cover out the way?
I'm not too familiar with diesels...what am I looking for when I check the vacuum pump and injectors?

I'm essentially trying to learn about the car as I do maintenance on it.
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Old 03-20-2017, 05:35 PM
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Anyway, here is a video of it.

https://www.youtube.com/watch?v=0-GwSjdHpyI&feature=youtu.be

Honestly, where should I start, from least invasive to most invasive.

I would like to cover as much ground as possible.
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  #6  
Old 03-20-2017, 05:43 PM
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sounds like lifter noise to me.

new oil

drive it like you stole it
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  #7  
Old 03-20-2017, 05:52 PM
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Originally Posted by Phillytwotank View Post
sounds like lifter noise to me.

new oil

drive it like you stole it

I was figuring valve train noise as well.

I know merecedes source has a video on changing them, but I can almost bet my life he charges money for you to watch that video....

There are service manuals out there with procedures on how to undertake such a thing right?

Or is this not covered in a manual?
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  #8  
Old 03-20-2017, 08:11 PM
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Also removed old vacuum pump as well, will get a new one soon

It's the old style pump
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  #9  
Old 03-20-2017, 08:58 PM
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Certainly some tappet (lifter) noise going on. Some say synthetic oil will help clear them out. I had no luck with that and disassembled and cleaned mine. No more lifter noise.

The other "clack" noise you have going on sounds more like injection knock. Could be a variety of reasons for it. I have 1 cylinder (no 4) that does that noise constantly. Cracking the injection line stops the noise immediately.

What I don't hear in the video is "bottom end" noise. Sounds like a combination of the more common knocks and noises from these engines.
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  #10  
Old 03-21-2017, 12:06 AM
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Quote:
Originally Posted by Father Of Giants View Post
I was figuring valve train noise as well.

I know merecedes source has a video on changing them, but I can almost bet my life he charges money for you to watch that video....

There are service manuals out there with procedures on how to undertake such a thing right?

Or is this not covered in a manual?
There's a good youtube on an OM602 head removal. Getting at the hydraulic lifters is basically much of that up to removing the cam. The manifolds, injectors stay on. I think the lifters just come out with a magnet for you.
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  #11  
Old 03-21-2017, 12:20 AM
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You can get the manual at 190rev.net
190Rev - The Front Page 190Rev.net

As a supplement to the manual you should be good if you follow this video up to about 3:37. You can leave the fuel system alone.

https://www.youtube.com/watch?v=xD3TEVzgrF8

pulling the cam is tricky. I think the appropriate timing for removal is with the timing marks on the cam and head lined up.

OM602 CAMSHAFT

You need to follow the loosen/tighten procedure or you can break the cam the book says.

Of course, don't drop things down the chain alley.
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82 Benz 240 D, Kuan Yin
12 Ford Escape 4wd

You're four times
It's hard to
more likely to
concentrate on
have an accident
two things
when you're on
at the same time.
a cell phone.


www.kiva.org It's not like there's anything wrong with feeling good, is there?
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  #12  
Old 03-21-2017, 12:24 AM
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As a matter of fact, I think you can leave the belt tensioner alone too. So maybe just set the time, I zip tie the chain to the sprocket, release the chain tensioner and pull the caps (per sequence in the manual).
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CC: NSA

All things are burning, know this and be released.

82 Benz 240 D, Kuan Yin
12 Ford Escape 4wd

You're four times
It's hard to
more likely to
concentrate on
have an accident
two things
when you're on
at the same time.
a cell phone.


www.kiva.org It's not like there's anything wrong with feeling good, is there?
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  #13  
Old 03-21-2017, 03:13 AM
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moon161,

How do I find the manual for the the OM602 head removal? When I type in "OM602 head removal" in the website, nothing relevant pops up. Could you link me to the thread or article by chance?

Last edited by Father Of Giants; 03-21-2017 at 10:09 AM.
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  #14  
Old 03-21-2017, 10:48 AM
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I actually found it here:
W201 Workshop Manual Download

You shouldn't need to pull the head to replace the hydraulic lifters, only the cam.

Finding things in the manual is a bit of a puzzle until you sort it out.
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CC: NSA

All things are burning, know this and be released.

82 Benz 240 D, Kuan Yin
12 Ford Escape 4wd

You're four times
It's hard to
more likely to
concentrate on
have an accident
two things
when you're on
at the same time.
a cell phone.


www.kiva.org It's not like there's anything wrong with feeling good, is there?
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  #15  
Old 03-21-2017, 10:55 AM
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Also moon161,

what book are you referring to about the cam? I would like to purchase it if possible. Edit: You found it!

Diseasel300,

What exactly is diesel cracking? Is it when you give the injectors diesel purge?


Last edited by Father Of Giants; 03-22-2017 at 08:01 AM.
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