Diesel Mechanics, Engine/Injector Experts please - Nissan 2.3d engine Vanette/LDV Cub

[Channel Hopper]

Not the engine itself, but the supplementary injector feed mechanism, the culprit sprung a leak on the No4 injector, between the main body and the engine sleeve. Nobody at Nissan could help as there are no seals (some 25 different shims though), so in the end I purchased two complete units from a breakers.

I have fitted one, and the van now starts with no leak from the original point, but I am not sure about the set of run off pipes running in series - front to back (is this something to do with keeping the injectors from freezing in cold weather ?) and whether it should be blanked off at one end , - a really nasty looking bit of soft plastic sits there presently - , or if it should be redirected into a a return pipe to the fuel tank. It is all low pressure stuff, and a finger on the end off the nozzle seems to stop the flow of fuel.

On the old Citroen 1.9 TD (Xantia engine) I owned some three year ago, the system had a return run back to another bit of kit (via a filter?), but the Nissan seems to have no such run off, it is just plugged.

The bit of plastic/rubber leaks slightly, and can be pulled off the nozzle rather easily. Is it something that has been fitted as a lazy Friday fit, or is it standard and needs to be made leakproof ? Last thing I need next week is to find I have blown a major pipe because of a botch carried out tomorrow morning.

Thanks in advance.

 

[2cvbloke]

Sounds like a return line that would run back to the fuel tank with unused diesel, though I'm no mechanic, but that does seem to fit the bill...

Could you not get hold of a Haynes manual on that specific diesel engine?

 

[Channel Hopper]

Sounds like a return line that would run back to the fuel tank with unused diesel, though I'm no mechanic, but that does seem to fit the bill...

Could you not get hold of a Haynes manual on that specific diesel engine?

That is what I was thinking (same design as the Citroen engine)

Of course I could get a Haynes manual, but not before Monday (and that is assuming there is some specific port in the fuel tank to take the spent fuel, there is nothing under the seat that indicates a return system to the tank.)

 

[PaulR]

AFAIK all diesel engines operate on the principle of bringing more fuel than is needed and returning the unused to the tank. On my old Montego there was a return from the high pressure pump and from the top of the injectors. The excess fuel is necessary to ensure internal lubrication of the system I believe.

 

[Channel Hopper]

Thanks, I thought as much.

Now to find a manual

 

[T_G]

Not just diesel, any fuel system with a high pressure fuel pump (used normally for injection systems) needs to have a return pipe. Only the simple low pressure fuel pumps as used for carburettor systems did not always have return pipe I think.

 

[Channel Hopper]

And, no manual on eBay, just factory downloads.

I may need to blag a look under the seat of somebody that owns one nearby.

 

[mountainman]

try dieselbob at _www.dieselbob.com he may be able to give you the answer your looking for.
I have one of these vans but its dark now so I cant see the pipes

 

[Channel Hopper]

Thanks, Dieselbob has nothing on his site to show he is supplying manuals or parts for Nissan/LDV engines.

If you are able to lift the seat tomorrow, please let me know if the injector at the rear of the cab - No4 - has two low pressure pipes (black plastic/fibre), or just one black pipe from injector No3 and a blanking plug on the other side.

 

[mountainman]

I have just looked at the set up on my cub and the last injector pipe has only a very short blanked off pipe at the rear of the injector, it do not go anywhere.
hope this helps.
dieselbob will try to answer questions on diesel engines of all types, ive found him very helpful regards biodiesel querries.

 

[Channel Hopper]

That's great. If yours is the same then I have no reason to worry that the last mechaninc that worked on the van did a botch job.

The injector lubricating system must operate on a total loss system then, much like a two stroke engine.

 

[mountainman]

Glad to be of help on something I know about, as a newbie to this sat stuff I'm out of my depth with most of it.
Just trying to update my system to a Fortecstar Lifetime Ultra+ and HH motor and its not as easy as it seems, well to me anyway!!!!

 

[Channel Hopper]

HtoH motors are not the easiest to start off with, especially if it is your first one, but If the receiver is anything like the Passion (or Passion Plus) , setting it up shouldn't be too hard.

Have a look in the appropriate sections on motors and receivers and then ask away.

 

[waverider]

That's great. If yours is the same then I have no reason to worry that the last mechaninc that worked on the van did a botch job.

The injector lubricating system must operate on a total loss system then, much like a two stroke engine.

Hiya CH, just getting the tail end of this thread! Are you talking about the injector 'Leak Off' pipes? If so, it's quite common if the pipe is flexible fuel resitant type to be capped off at one end.

It saves manufacturing cost's to produce a banjo with one connection!

 

[sonic1]

Sorry a bit late here, I work at a Nissan dealership, all you need to do is blank off the last injector.
If you dealer can not identify the part then go to a diesel specialist.
If you still struggle to find the part then stick a screw in the end of a piece of rubber pipe.
Last resort if you need parts pm;)

 

[Channel Hopper]

Sorry a bit late here, I work at a Nissan dealership, all you need to do is blank off the last injector.
If you dealer can not identify the part then go to a diesel specialist.
If you still struggle to find the part then stick a screw in the end of a piece of rubber pipe.
Last resort if you need parts pm;)

Thanks, already done. A complete run off kit with two bungs was 3 quid at the local auto factors. I was simply surprised that - unlike the Xantia 1.9TD I had two years back, there was no run off back to the tank.
Since the last injector was the one that failed, I thought that the bung was just a quick selling fix by the last owner. I bought two injectors from a breakers just to be safe.

Have you known of injectors failing at the centre seal before ?

 

[mountainman]

channelhopper,I got the motor and dish set up on thor but I'm having trouble getting the motor to move east west, will check all my connections tomorrow, but I'm worried that as my dish is about 80mtrs from my house that the distance is to far for the signal to travel , if so is there any way to boost the signal? I can move the dish by using the buttons on the motor and it get 28e ok so I think the arc is ok, any help greatly received,thanks

 

[Channel Hopper]

I take it you have enabled the DiSEqC/USALs on a per satellite basis within the setup menus ?

Simple check would be to take the receiver down to the shed and try it on a short run of cable, but I would have thought if the voltage reaches the motor, then the DiSEqC commands would also get there. I have however heard of some motors that are less sensitive to the commands.

 

[sonic1]

Have you known of injectors failing at the centre seal before ?

Yes m8,
I have seen almost all types of injector failure of the years, some are common others are not.
If you have a couple of spare injectors keep em safe.
One other point I will make is injector cleaner is worth every penny.
If you have never used it buy 2.
Put one straight in the fuel filter and run it through and the other in the tank.
Small price to pay for looking after the injector.
Like I said, if you ever need any genuine parts pm me;)

 

[Channel Hopper]

Thanks.

Ive never had an injector fall apart before, no matter how much chip oil/kebab grease/lard I've thrown at it