E320 Cdi Fuel Filter

[THEKAT]

Hi everyone first day on here ! Got a 2000 e320 cdi and enjoy doing my own servicing ( honest the wallet busting merc prices have nothing to do with it) .Fitting new fuel filter so does anyone know the procedure for removing and re-fitting the circular fuel line clips , ie are there special pliers required ?

 

[Dieselman]

If you mean the one with white plastic horsehoe clip, then just squeze it into the body by hand and pull the union out.

The others can be replaced with regular fuel pipe clips.

 

[THEKAT]

Those white clips I am ok with its the crimped ones I have prob with , how do they come off and how are the new ones closed up ?

 

[Dieselman]

You can just prise them off then crimp the new ones with pincers or change them for screw up hose clips.

 

[THEKAT]

cheers mate !

 

[c240yaz]

Not sure about the Diesel, but on the petrol filter, which uses "Clic R" clips, I bought a set of these. (Not yet replaced the filter yet, no time)

 

[BlackC55]

It is also good to fill the filter up with diesel to aid starting.

 

[Dieselman]

Or any other flamable liquid such as engine oil or vegetable oil..

 

[THEKAT]

ok cheers fellas , any thoughts on those clips though are they MB only or will your normal motor spare shops sell them? Dont really fancy jubilee clips as hard to get a round seal on small diameter !

 

[television]

ok cheers fellas , any thoughts on those clips though are they MB only or will your normal motor spare shops sell them? Dont really fancy jubilee clips as hard to get a round seal on small diameter !

Only from MB or a diesel specialist, they are cheap from MB though, I believe that they do kits for this

 

[c240yaz]

Or any other flamable liquid such as engine oil or vegetable oil..

Dieselman, Would you really put engine oil in a diesel fuel filter for priming ? ?

 

[television]

Dieselman, Would you really put engine oil in a diesel fuel filter for priming ?

No he would not, thats a fact

 

[Dieselman]

Only because I've got a ready supply of Bio-diesel handy, otherwise I would unless I had a can of diesel.

I know someone who was a HGV mechanic and they used engine oil all the time to prime the filters and if I recall I have done this on the Merc.

The oil is only to fill the void and will be readily drawn through the filter as it mixes with the diesel.
If Mercedes fitted priming pumps this wouldn't be necessary.

Don't forget the fuel system is delivering much more fuel than the pump injects, up to ten times too much fuel at idle, so the engine oil will soon return to the tank via the leak-off.

 

[c240yaz]

Only because I've got a ready supply of Bio-diesel handy, otherwise I would unless I had a can of diesel.

I know someone who was a HGV mechanic and they used engine oil all the time to prime the filters and if I recall I have done this on the Merc.

The oil is only to fill the void and will be readily drawn through the filter as it mixes with the diesel.
If Mercedes fitted priming pumps this wouldn't be necessary.

Don't forget the fuel system is delivering much more fuel than the pump injects, up to ten times too much fuel at idle, so the engine oil will soon return to the tank via the leak-off.

In all my years as working on HGVs, here and the Arabian peninsular, I have never heard of anything other than using diesel fuel oil, (except maybe red diesel) to prime the system.

It's not a question of how much fuel the pump is delivering, it's more the fact of viscosity of the engine oil going through the filter, fuel lines, pump and injectors.

Engine oil is too thick, especially to spray through the injector nozzles. And what about the return of non injected engine oil to the tank. This would mean that your tank would be contaminated with engine oil, diluted yes, but you would be blowing smoke for a while.. and I would be wanting to change the filter again, after being contaminated with engine oil. Not to mention being sacked, for incompetence.

Engine oil may very well work, but I would never take the risk of trying this out on my engine, or other, to see if it did. I'll take your word for it that it does !

 

[television]

In all my years as working on HGVs, here and the Arabian peninsular, I have never heard of anthing other than using diesel fuel oil, (except maybe red diesel) to prime the system.

It's not a question of how much fuel the pump is delivering, it's more the fact of viscosity of the engine oil going through the filter, fuel lines, pump and injectors.

Engine oil is too thick, especially to spray through the injector nozzles. And what about of non injected engine oil to the tank. This would mean that your tank would be contaminated with engine oil, diluted yes, but you would be blowing smoke for a while.. and I would be wanting to change the filter again, after being contaminated with engine oil. Not to mention being sacked, for incompetence.

Engine oil may very well work, but I would never take the risk of trying this out on my engine, or other, to see if it did. I'll take your word for it that it does !

All of the points that you raise here are valid, and I do share the same view

 

[Dieselman]

It's not a question of how much fuel the pump is delivering, it's more the fact of viscosity of the engine oil going through the filter, fuel lines, pump and injectors.

Engine oil is too thick, especially to spray through the injector nozzles. And what about the return of non injected engine oil to the tank. This would mean that your tank would be contaminated with engine oil, diluted yes, but you would be blowing smoke for a while..and I would be wanting to change the filter again, after being contaminated with engine oil. Not to mention being sacked, for incompetence.

Engine oil may very well work, but I would never take the risk of trying this out on my engine, or other, to see if it did. I'll take your word for it that it does !

Interesting comments there.

Modern engine oils are lower viscosity than SVO and that will pass through the filter, pump and fuel lines undiluted, why shouldn't 5W-40 which will be straight away diluted by the diesel in the system.

As far as contaminating a tank full of diesel with 250ml of engine oil, don't you think that's stretching things a bit, and it won't cause blue smoke as the oil will still vaporise and burn no problem.

The injectors won't be spraying pure oil due to the flushing of the fuel system down the leak off.

CDi injectors and pump might just last a bit longer if you add some additional lubricant to the diesel.

How do you know you would be sacked for incompetancy if you never tried it? Maybe you thought I was referring to used engine oil.??

Just for you I'll run a test this w/e.

Will the Bio-burner survive or will it blow up..??

Place your bets....

 

[television]

The other thing here is the effect on the emissions and if you did use oil in the filter just before the test (MOT)

Any oil unburnt would form as soot, and it is these particles.that you cant get rid of, adding oil could fail your Test
Euro 4 emissions are set at 0.025g/km. Diesel engines do not run hot enough to burn it as they rarely reach 400c in the exhaust.

With Euro 5 set to 0.005g/km this are getting tighter

 

[Dieselman]

So how does using SVO reduce the emissions given that it is higher viscosity? Surely doesn't that form soot in the exhaust.

All diesels have soot in the exhaust, that's why they have multiple revs with the first one often being very smokey due to the soot blowing out.

I feel your post is conjecture rather than factual.

Let's not get carried away, we are talking about 250ml of oil in say 70 litres of diesel.

We shall see..

 

[Dieselman]

Euro 4 emissions are set at 0.025g/km. Diesel engines do not run hot enough to burn it as they rarely reach 400c in the exhaust.

With Euro 5 set to 0.005g/km this are getting tighter

How are these figures measured with an opacity meter?

These are not MOT test figures, they are manufacturers design figures and achievable by use of particulate filters, which incidentally are heated to high temperatures to burn off the trapped particulates.

 

[television]

It was the effect of putting it in the filter bowl that caused the alarm, yes a lot of it is unknown territory and any research would take too long.
Am I guessing that oil can not be atomized down to the same level as deisel, it is my thoughts that it could not be.

I do understand the unburnt soot particle bit very well and the problems in getting rid of it