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Discussion Starter · #1 ·
Hi all

Whilst investigating what could be causing the diesel that leaked off of one of my recon'd injector to be dirty during a leak off test, I am wondering if this could be responsible?

I am referring to the black ring that sits between the body of the injector and the base of the nozzle - its all crumbled.

Is this a seal? Or is it just carbon that has filled a gap?

This part would normally be hidden behind the metal seal, but the inside of the seal against the nozzle isn't sealed therefore gases in theory could go through there if they have somewhere to go.
 

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Discussion Starter · #2 ·
Ah good man, thanks for having a look at that. Didn't want to go ahead and pick it all out just incase. Shall whip the injector back out at somepoint and pick it out. :)

Cheers buddy
 

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Megger
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Got the same issue; not only dirty diesel but also more than the Delphi recommended leak-off of 1.4 times the smallest amount. Will be having it exchanged very soon.
 

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MEG Corporal
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dirty fuel beinng leaked back on an injector would suggest to me a badly or shoddy refurbish .. on the injector and i wold hot foot it back to wherever they did the job.. some places to this sonic cleaning of flush cleaning of the injector . and they call this a refurbish .. it is not .. to refrubish an injector it must be taken down and parts replaced and tolerences checked . some injectors may even be too badly worn to be refurbished .. . the only way dirty fuel could get in to and injector other than from the inside of the injector .. is by being pumped in from the injector pump .. make sure a good filter is in place has to be ford of bosch or delphi filter .. because if dirt was getting to the leak off section then its a short passage to get to the injector nozzle . and this has an orrifice finer that human hair.. .. s.ps in china you can bring your injectors in to a refurbisning place and they are done then and their in front office inn front of your face . pintles and springs replaced and the injectors tested break tested and flow tested . etc.etc .. no mystery and the charge will include a bring back clause in case the injector is still suspect for seven days ... its about time some of our home grown injector specialists followed this example and gave people the service which they charge soo dearly for .. s
 

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Megger
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I assume that the reconditioning of the injectors is good since they come from Swadlincote, who are Delphi recommended. Also, the new filter is a Delphi.

I agree about dirty fuel coming form the pump but why would only one injector be leaking-off dirty fuel? To my mind, that is not possible!
 

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MEG Corporal
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there is an outside chance the injector is not closing properly ..not shutting properly and this may cause the combustion discharge from the piston compression discharge to force combustion back into the injector nozzle.. have that injector taken out and bench tested ... and if i were you i would be hoping they find what happening . . plus is dosent make no never mind who done the injectors . if its a common rail tdci . and only one injector is leaking dirth then its the injector . if it was happening on all four injector s then i would defo .. suspect the pump .. but because its a common rail then it can olnly be the injector .. ps.. make sure that injector is properly sealed when it going bak in its hole . oil can seep past and badly sealed injector into the the combustion chamber . and if the oil was getting in then is may force feed the injector nozzle. .s
 

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Discussion Starter · #7 ·
Right, a second hand injector is on order from the bay. Don't intend leaving it in there for good but am interested to see if it stops the irritating ticking noise.

Mot on saturday too. Wish me luck ;) Quick question on that topic, anyone know how bad a cv boot needs to be to fail? As in does it need to have a massive gash in it or does a slight crack around the metal strap holding it on on the hub end with a tiny bit of grease seeping out mean its doomed?
 

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Megger
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Right, a second hand injector is on order from the bay. Don't intend leaving it in there for good but am interested to see if it stops the irritating ticking noise.

Mot on saturday too. Wish me luck ;) Quick question on that topic, anyone know how bad a cv boot needs to be to fail? As in does it need to have a massive gash in it or does a slight crack around the metal strap holding it on on the hub end with a tiny bit of grease seeping out mean its doomed?
While I agree with Shane on this, I would suspect that it would be an MOT failure. I also have a grease leak from the gaiter boot but fortunately, it is because the metal band has been squashed out of shape.. Hopefully, replacing it with cable ties will cure the problem.
 

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Discussion Starter · #9 ·
Thanks chaps for the boot advice :)

Regarding the injector, I have this morning put on the ebay injector in place of the one that leaks back dirty diesel. This resulted in the car running worse. This was in cyl4. Now, in cyl1 i knew that the injector was leaking out a tad too much so i put the dirty leak back on in cyl1 which made the engine a lot smoother. The engine still sounds like a woodpecker under load. I need to do a leakback test as im unsure whether the injector is leaking back dirty still and don't worry im gonna do that today :) Don't intend leaving it in there.

Also posting in another thread about fsuper not being up to the coding job so exploring that route too. Will post back any updates :)
 

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MEG Corporal
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yea jmang.. a leaking boot will defo fail .but anyway you shuld do the boot because even a small split in the boot will cause all the grease to be ejected by centrifical force . lol .remember you schooldays science experiments on the train going round a bend and where the forces are applied . this is why roads need camber . and why a split boot will throw every drip of greese out through the split .and then the joint wont last issing time becase no grease ...... and to reksu . yes a cable tie might help ....better that nuffin but its very hard to get the cable tie to tighten up proper on the rubber . try getting a crimp type metal clip in position and then using a wire side cutter or an old nail or wire cutter squeeze the crip section tight home. they are really the best man for the jobbie.. jmang you really need to uck that bad injector away man and ebay injectors are a dead loss . nobody puts good injectors on the ebay just scrap they want rid of ... also you need to recode those injectors as this may help . . try posting your locality and maybe on of the good men with a ford diag . may be living near enough to yo and do the recoding for yo for a few bob man ..s
 

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Megger
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Salta,

Was planning to use two cable ties with the locking tab off-set. I will look for the proper clip.
 

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Just use zip ties thats what you get in a cheep boot kit I had a small hole in my boot I cleaned the grease off with spirit wipe then used two pack glue on the hole and its been fine for nearly 3 years.

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