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  #1  
Old 03-07-2007, 02:27 AM
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Diesel Knock after new seals and return lines

My 300sdl ran like a top until last Thursday. A bit of diesel knock on cold morning but once it was warmed up it was almost a quiet as a gaser.

The IP was leaking on top. I took it to a local private MB shop, had the seals replaced and the non standard return lines replaced.

Now it has a loud diesel knock at idle that does not go away when the motor is hot, and feels like a gas engine with a miss, i.e. the motor rocks side to side, and you can feel it in the car.

If I put the car in neutral and rev the engine very slowly it has what I would describe as going from hammering to 1000 rpm where it just seems to have a shudder, not running smooth, and the at about 1800-2000 rpm it is smooth again.

I think the diesel knock is in #1. When I put my hand on the return lines from 1 to 6 It is most prevelant at #1. I also used an infared temperature gun on the injectors and #1 is about 192 degrees and the temp is even at about 197 for 2, 3, 4, then goes up to about 205 on #5 and 215 on #6.

Everyone who know the car wants to know what is wrong with it. The diesel knock is loud. I know it is not just me.

Along with this, I now have what smells like exhaust fumes coming into the car through the heating system. I can smell and see the exhaust in the engine compartment, but cannot fine the source.

At speed it runs well.

Last week I had a great car with a leak, now I have a smelly car that runs rough.

Any thoughts for correction.

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  #2  
Old 03-07-2007, 06:12 AM
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I'd have your injectors tested.
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  #3  
Old 03-07-2007, 06:50 AM
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Exclamation Hold that indy MB shop responsible

Perhaps you should take it back to the mechanic that did your seals replaced.....if someone, like a helper, decided that they needed to loosen the nuts on either side of the delivery valve.....then your IP is more than likely out of calibration.....I would assure that the local MB shop make it good.....

If you look closely at the top of your IP each of those nuts should have a drop of bright paint.....Bosch uses the paint as a seal, to assure that no one fools with those nuts, and will void any warranty if they are disturbed...

SB

Luck to ya......but I would get an Attorney if necessary....the shop should be held responsible...
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  #4  
Old 03-07-2007, 07:35 AM
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I believe there is a law in California warranting any work performed by a mechanic for a pretty decent time period.
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  #5  
Old 03-07-2007, 09:40 AM
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What most likely happened is that one of the delivery valve seals didn't seat correctly. They can be a bit fickle at times.

Take it back to the shop and show them the injection knock and suggest that one of the delivery valves is amiss.
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  #6  
Old 03-07-2007, 09:42 AM
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Have them fix the exhaust leak also. They could have knocked something loose as well.
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  #7  
Old 03-08-2007, 12:54 AM
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Brian:

Can you tell me more about a "delivery valve"? Is there a diagram or exploded IP view where I could see and understand the principles better/

Regards, NRK
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  #8  
Old 03-08-2007, 09:10 AM
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The diagram is in the engine manual.

What usually occurs is the o-ring fails to seat properly. There is a specified three step torque sequence that is necessary to properly seat the o-ring. This tells me that it's not a good design and can be a bit problematic in getting it back into position. Many folks have suffered a similar fate.
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  #9  
Old 03-08-2007, 02:55 PM
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Thanks for the information. My manual is in .gif so I have a lot of searching to do.

Regards, NRK
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  #10  
Old 03-08-2007, 04:37 PM
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posting link to three step torque sequence?

thanks!
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  #11  
Old 03-08-2007, 05:36 PM
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Quote:
Originally Posted by turbodeezl View Post
posting link to three step torque sequence?

thanks!
Tighten to 30Nm
Loosen
Tighten to 30Nm
Loosen
Tighten to 35Nm.
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  #12  
Old 03-08-2007, 06:19 PM
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These "delivery seals" are o-rings in the injection pump, then?
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  #13  
Old 03-08-2007, 06:21 PM
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They are part of the delivery valve at the individual outlets of the IP.

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