tector engine leaking deisel into exhaust system?

pump timing issue(requested fuel entering cylinder at untimed interval...fuel partially heated but not fully combusted..)or..injector hosing fault?have u fitted genuine injectors?..not that thats a garantee,in my experience.good luck.

scott
January 2011

when you disconected the plug from the Mprop on the pump ,it defaults to MAX fuel pressure ,and puts on the warning you had and the engine sounds like a bag of spanners ,so you where driving with MAX pressure in the fuel rail at all times ...not good .check the oil level and see if fuel has got in to the sump

not sure about the iveco ,but with the DAF the pre filter housing gets chocked with crud which puts the warning on when the engine is under load ..never had any issues ...

when you change the injectors they do smoke like hell till you take them for a good run..i imagine it's what remnants of fluid bosch use to test them ..

if you haven't cracked the head,which i doubt ,though may need pressure testing .but if you are having excess fuel coming out the leak off then it will probably be injectors ...remove the tubes but don't mix them up as they have to go back in to the inj they came out of ,look at the end of the tube and check for erossion you'll see lines where the fuel has escaped by ..you may just get away with 6 new tubes ..if iveco don't do them seperate ,then DAF dealers or cummins should ..the nut that holds them is torqued to 50nm ,you can try tightening that first ..also make sure the inj bolts are tightened down evenly are the clamp they go through is not at an angle ....to test the injectors blank of number 1 on the rail so its only running on five injectors ,and over a min you should get less than 30ml at the leak off..then do no 2 etc...if you get more than 30ml ,say 60ml and when you disconnect no2 it drops to 30ml then no2 is faulty ,you then replace no2 and then carry out the test again starting at no1 till you get to no6 .and you should have 30ml or less at each injector...

only other idea is pressure relief valve is faulty

norb
January 2011

yes i did change pipes when i changed injectors & it was all 6

andy
January 2011

all the parts i used was genuine iveco parts, i replaced all these parts becouse the lorry was haveing trouble starting & the edc light would come on sometimes 10 min after starinng or it could be 60 min, i spoke to iveco & they said it was the injectors so i changed them. it did then start first time for a month i guess but then it went back to not starting that well. then they told me to try both common rail switches but still no change. someone told me to i could start the lorry by unplugging the electric connector on the common rail switch then turning it over, it did start straight away but the edc light was on & there was a diesel knock. i no i shouldnt of but i did use it like this for half a day..... next day i tried to start it again, big diesel knock & lots of smoke when trying to start! so i left it & got back in touch with iveco. they said only thing left to change was high pressure switch on fuel pump, so i changed it & yes it did start but it was still smokeing & it was missing or something it just didnt sound right, so phoned iveco again, they said that it was just proberbly air in the system & it would clear after a good run, the smoke did clear but it was still not running right. 5 hours later lots of smoke big diesel knocking with diesel pouring out of exhaust, i didnt no if the return line in the head had cracked or something & it was going straight into the exhaust outlets. on the back of the block you have got the return pipe i have takeing this of & i did get the lorry to start there was not alot comeing out, but a good amount was flowing out of the exhaust.

andy
January 2011

if it is the small cummins ,that both iveco and DAF use ..it's a fault i haven't come across ,and i've been working on this engine since it came out ..so i'll need to ask a few more questions ...

has the fault only occurred since you changed the injectors ?

why did you change them and did you change them all???

did you use genuine parts from iveco ???

you replaced both the injector and the tube ???

norb
January 2011

if it is the small cummins ,that both iveco and DAF use ..it's a fault i haven't come across ,and i've been working on this engine since it came out ..so i'll need to ask a few more questions ...

has the fault only occurred since you changed the injectors ?

why did you change them and did you change them all???

did you use genuine parts from iveco ???

you replaced both the injector and the tube ???

norb
January 2011

im not 100% shure but yes i think it could be

andy
January 2011

is this the small cummins engine as used by DAF as well???

norb
January 2011