Injectors and Grease

[m80]

I've removed the injectors from the 2014 Viano.
They came out with ease due to hi temp grease on the shaft.
In fact the grease was used excessively and attracted much.

My assumption was that they had been out before as I don't believe MB used grease at manufacture.
I mentioned that to the injector tester and he said they do use the grease.

What do others think?

 

[bob6600]

I don't think MB (or any manufacturer) uses grease as they don't need it to aid them putting the injector in and are not concerned about it coming out years later. It is also a cost during production that is not needed. With lots of threads on stuck injectors, I would say no.

 

[mersum1es]

I never seen grease on injector bodies when I have removed injectors, but yes I think that white moomin sh*t will prevent some stucking if bottom seal start leaking...

 

[Bellow]

If a grease is to be used it had better be one with extreme high temp capability. Anything less will carbonise and be worse than none.

 

[mersum1es]

If a grease is to be used it had better be one with extreme high temp capability. Anything less will carbonise and be worse than none.

MB original grease A001989425110

 

[Bellow]

MB original grease A001989425110

I didn't realise a dedicated grease existed for the application. Removes the guess work.

 

[bob6600]

I didn't realise a dedicated grease existed for the application. Removes the guess work.

It does and isn't cheap either! I bought a very small tub and it was around £16! Having said that, it does the job perfectly and you only require a small amount. Mercedes call it 'special grease' if I remember correctly

 

[Bellow]

It does and isn't cheap either! I bought a very small tub and it was around £16! Having said that, it does the job perfectly and you only require a small amount. Mercedes call it 'special grease' if I remember correctly

'Special Grease' is indeed what they call it. I tried to find a tech data sheet for it to see what it's base was but no joy. It's possibly that Krytox stuff which is absurdly expensive and isn't really a grease as such. Also specified for sunroof sliders IIRC - but why such high temp capability (Krytox's USP) is required still eludes me. I live in Scotland, but surely the sun isn't that hot further south.

 

[Martin 1]

Is this the one ? or is it just for diesels ? MB E W211 Diesel Injector Grease A001989425110 GENUINE NEW on OnBuy

 

[m80]

Is this the one ? or is it just for diesels ? MB E W211 Diesel Injector Grease A001989425110 GENUINE NEW on OnBuy

That's what I've used in the past,
and for these when they go back in.

A bit strange that MB have a super duppa 'special' grease for this,
but don't seem to use it.

 

[Tuercas viejas]

We use it AND on the threads of glow plugs no less .
That stated I cannot see it being better than common anti seize compound.
Which by the way Dodge (Mopar) provided in a sachet c/w new hold down bolt and washer with the Injector from MB & then MOPAR re-boxed for the Sprinter range of vans from 2002 to 2009.
Following the divorce that happened between these two very dissimilar companies it then all stopped .
Basically bugger off and darken the MB dealer doors.
Talk about "Gettn outta Dodge" .
Tuecas Viejas

 

[PDC]

I don't think MB (or any manufacturer) uses grease as they don't need it to aid them putting the injector in and are not concerned about it coming out years later. It is also a cost during production that is not needed. With lots of threads on stuck injectors, I would say no.

I have just pulled the injectors from my 2008 Vito 115 and found them fairly generously coated in white grease. As I have owned the machine from new and no-one has ever worked on it than me, I can categorically tell you that you are wrong and MB do in fact coat their injectors on assembly. Any manufacturer who cares about keeping down excessive warranty claims for such things as replacement heads for engines where the injectors had seized solid would try to minimise faults like this by using a low cost preventative measure such as a bit of grease.

 

[ALFAitalia]

I've replaced a few injectors on the 5 pot 270 lumps....never seen a trace of anything. Putting grease in incase the washer leaks is a bit odd. They don't touch the recess walls otherwise so could not seize in place without the black death.

 

[PDC]

I've replaced a few injectors on the 5 pot 270 lumps....never seen a trace of anything. Putting grease in incase the washer leaks is a bit odd. They don't touch the recess walls otherwise so could not seize in place without the black death.

I would say that coating with grease isn't necessarily going to stop the black death from seizing the injectors in but it might help. My two inner injectors came out easily and were still nicely coated in white grease, I have managed to pull #1 injector eventually after soaking it in PlusGas but it was pretty well caked with carbon and obviously leaking at the seal when I ran it before stripping the injectors out, but #4 is still defying attempts to move it. I expect to find it coked up too when I get it out but it didn't appear to be leaking when I ran it. I'll be cleaning them all up, changing all the seals and bolts and greasing throughout when it goes back together.

 

[ALFAitalia]

My slide hammer with the injector pulling attachment has not been beaten yet!

 

[PDC]

My slide hammer with the injector pulling attachment has not been beaten yet!

Unfortunately I don't have one of those but modifying and old spanner so that I could turn the injector and loosen it off worked on #1 but #4 is being more stubborn and so far I can't turn it at all. If a bit more soaking doesn't work then I only need a nut of the right thread to be able to rig up a slide hammer so that'll be next. It has the Piezo type of injector so I believe it can be pulled using the fuel inlet connector on top.

 

[ALFAitalia]

Not that thread....but the one thats revealwd when you unscrew the top. My kit contains with an adapter for that too....but if you remove them that way it will usually stretch the thread and ruin the injector....fine if you are replacing it....not so good for recon!

 

[PDC]

Not that thread....but the one thats revealwd when you unscrew the top. My kit contains with an adapter for that too....but if you remove them that way it will usually stretch the thread and ruin the injector....fine if you are replacing it....not so good for recon!

The top doesn't unscrew on these injectors as far as I can see. It's this type: