Diesel injector clamp bolt. Torque setting please?

[Tashman]

I've had the "Black Death" on just one injector on my car - I've nearly finished the job, I've followed all the advice, and I'm putting it all back together now.
I've bought a replacement clamp and bolt and I'm wondering how tight to do up the bolt, because I've heard it's a stretch bolt?
Thanks in advance,
The car is an 1999 E220CDI with the OM611.961 engine.

 

[Xtractorfan]

7nm is the recommended torque then turn a further 90 degrees followed by a further 90 degree turn.
You need to make sure that the threaded bolt hole is completely clean and free from fluids and debris.

 

[Westheath]

Don't forget the ceramic grease applied to the injector body.

 

[Tashman]

Thank you very much.
Yes I used the old bolt and cut a slot in it to make a thread chaser to clear out the hole which worked very well.
Yup ceramic grease was used.
Hoping for a good result!

 

[Frontstep]

Don't forget you need a clean seat for the injector in the head and the injector itself needs to be clean where the washer seats.

 

[bob 6600]

I chickened out at the second +90 degrees

 

[Steve@Avantgarde]

Its a stretch bolt, no need to chicken out. Its designed to go to that torque, if it isn't at the correct torque you risk the bolt coming out.

 

[bob 6600]

You are right Steve. To be fair, I got about 45 deg into it but then you know that feeling you get when a bolt is about to snap...well that's how it felt lol.

I guess having done loads you are used to it, I didn't want to risk a stripped thread incase I had missed something or not cleaned the threads properly etc.

 

[Tashman]

Thanks everyone.
After the 7Nm, I used a 1 meter breaker bar to do the pair of 90° for accuracy but also so I wouldn't get the sensation that would make me chicken out.

The job was a complete success!

I recommend using the Laser tools, they make it a lot easier.
One set is a seat cutter, and the other is a cleaning kit that gets rid of the gunk from all the different areas it gets in.

Laser set 4597 and 6101.

 

[Qainat]

Hi All, just a quick question, I have ML270 CDi 2001 - in the case to the black death, do the injector clamps need to be replaced with new ones?

 

[Mark A]

Not the clamps just washers and stretch bolts.

 

[Qainat]

Not the clamps just washers and stretch bolts.

Thanks Mark.

 

[Qainat]

How does one clean out the bolt hole?

 

[alexanderfoti]

I grind a flat in the old bolt and use that to chase the threads.

I also roll up a blue roll and feed it in to ensure no old diesel etc is sitting in the bottom of the hole

 

[Qainat]

Another quick question, I know the return line has a tiny O ring - are there any other O rings that go on the fuel injector itself?

 

[Qainat]

I guess there aren't any O rings on the injectors.

 

[mioba]

Dont guess ask the dealer. AFAIK its a washer.

 

[Qainat]

That's the copper washer that seals and sits below the injector.

 

[alexanderfoti]

No rubber o rings

 

[Qainat]

Thanks Alex.