Hello,

I've got a 2005 mazda 3 (ford inside), engine DLD 1.6, 109 PS. When I was blanking the EGR valve I saw some diesel surrounding the injector bases on all the four injectors. The diesel is clean no mark of soot or oil, just clean blue diesel. I tried to tight the fuel line and go with it. Checked online and found that this engine has a problem with the injectors screws getting loose over time (specially the 3rd injector). I tried this weekend to tight the 2 bolts that keeps them attached at the engine and only the third one get a half rotation and the others only just a little (5-10 degree) or nothing. 

I cleaned all the residue diesel on the area using some clothes, started the engine and waited to see if somewhere is bleeding. The 1st and 2nd injectors where slowly bleeding around the body as seen on the picture (this is an internet picture, i didn't have a camera there). I've dry it out again with a cloth and it get slowly wet again on the big bolt on the body of the injector. The engine works very well, no weird smoke, good quick start, pulls ok and no chuff sound. The part of o-ring on the return line and the solenoid/electric part is very dry.
Can someone point out if the return line o-ring is warn out where does the bleed occur? Is this leak related to the return line pipe or may come from the injector body?
Has someone experienced something similar. I'm still driving the car but I'm concerned about the diesel leaking over the engine (alternator and belts), it's a very small leak but it's still a concern. 

 

 

leaking very little quantity of clean diesel on the red line drawn.

So it's leaking between the main body of the injector and the large nut above?  You could try tightening the nut while counter-holding the body, though access will be awkward.  If that doesn't work, you'll need to have the injectors refurbed and the seals inside replaced.

Yes it seeping under the big nut. Do you have any info regarding this Bosch injectors? What seal isolate the large nut its a rubber or a metallic seal? 

It's a rubber seal.  I'm not sure if you can buy them separately though, usually comes with a replacement solenoid.

I've uploaded a video if someone is interested to see it

This looks like the o ring but don't know if I open this part change the rubber seal and close it again shouldn't mess with the calibration

On my previous 1.6tdci fiesta it was leaking from the seals where injectors go into head. I did stop leak by doing bolts up tighter, but when it was leaking, the pools of diesel around the injectors cooked from the heat of cylinder head causing diesel smell in the car and the pools turning into thick  black goo. I know yours does not leak in same place but I assume over time you will end up with the pool of diesel cooking like mine did. Might depend on journeys/how hot the engine gets. 

If you are referring to the copper O rings they differ from my problem. they usually tend to do the chuff sound because they let the compression out that brings soot/oil to surface

So theoretically it's not cooked diesel, it's oil/soot from the combustion.

I got the same issue but mines is pools of diesel by my injectors but the car runs ,what can I do to fix this?.