Question about injectors W124 OM606

[iamamanc]

Hi
I had the top off the engine yesterday 'cos a diesel return flow pipe had come off.
I noticed that when the engine was running there were bubbles blowing from deep down in the bottom of the reccess where the injectors screw into the head. I had just driven ca 100 miles so the engine was at temperature.
I am sure that I have read somewhere that at the bottom of the injector there is a small hole in the side of the seal. Is this normal that air or diesel should be blowing from around that area (where the injector in screwed into the head) causing bubbles to form?. My instincts say no, no, no.
This was happening on all the injectors apart from one. So one is good or five are good.
If the injectors are bad how much to replace/recondition them or could it be that the seals have gone. The engine runs and starts fine, cold and hot

Anyone any ideas

Cheers
Adrian

 

[Dieselman]

You probably need new heat Shields under the injectors. It's unusual for them to go so I suspect the injectors have been out at some stage and the shields weren't replaced, even if using the old ones they rarely leak.

Try tightening the injectors down a bit.

The shields only cost pennies, but you will need an injector socket to get them out.

 

[LastMinute]

you will need an injector socket to get them out

Or take the cylinder head cover off, then an ordinary deep 22mm (IIRC) socket will do.

 

[iamamanc]

Went to MB in Bradford today and had a word with a mechanic (actually I tried to cadge an injector removal socket). Anyway he reckons that it's a compession and not fuel leak. I had another look with a cold engine, lo and behold the left over diesel was bubbling on 1,2 and 3. I thought compression or fuel who cares and ordered 6 new seals and a socket, no go with cadging (apparently on a 606 engine the injector return nipples could get damaged with a normal socket - it needs grooves!!). I will get the injectors looked at while they are out as I have noticed lately that when the engine is cold and I let it reverse on tickover the front end seems to rock from left to right, my guess is a missfire although after 1 minute or so this dissapears, strange. Anyway anyone any tips on nozzles - what make, cost and so on and what is the torque spec for the injectors, does 40NM sound about right

Cheers
Adrian