om605 strange noise from back injector - Printable Version +- STD (https://www.superturbodiesel.com/std) +-- Forum: Tuning (https://www.superturbodiesel.com/std/forumdisplay.php?fid=6) +--- Forum: Engine (https://www.superturbodiesel.com/std/forumdisplay.php?fid=7) +--- Thread: om605 strange noise from back injector (/showthread.php?tid=5685)

om605 strange noise from back injector - RickyE - 06-25-2014 hello, my car has a strange hiss/tick from the back injector, ive tried tightening it, but was already very tight, took it out, clean the bottom face where it seals and what looks like a spacer, presume its the heat shield though, bout 2 or 3mm thick steel. I am surprised i didnt find a copper washer or seal of some sort though still the noise is there, replaced the leak off pipes aswell when i hold my hand over that injector i can feel air pulsing at me, but doesnt seem to be leaking diesel, or if it is a very small amount. heres a video to let yous hear the noise, any advice is welcome as its annoying me and likely not helping power or running any advice welcome and cheers RE: om605 strange noise from back injector - barrote - 06-25-2014 hy there , looks like the prechamber is loose. just that. injector , heat shield, pre chamber, and nothing else. pre chamber seats over the head and is tight by a special ring wich uses a special tool. , unless the head had been faced , and there was the need for a spacer. usually .3 mm .6mm .8mm. regards RE: om605 strange noise from back injector - ecFSE - 06-25-2014 Hi, It might be leaking compression between the head and the prechamber. Try spraying some soapy water around the prechamber/injector to see if its leaking. Can be hard to see on a 4-valve engine though. You need a big splined special socket to remove the ring holding the prechamber in place. RE: om605 strange noise from back injector - RickyE - 06-25-2014 http://www.ebay.co.uk/itm/MERCEDES-BENZ-SPECIAL-PRE-CHAMBER-RETAINING-RING-SOCKET-600-SERIES-ENGINES-/390503732306?_trksid=p2054897.l4275 is that the tool i need? also is it a hard job to tighten up the pre chamber? or just a case of removing the injector, and tightening the splined ring? Cheers RE: om605 strange noise from back injector - ecFSE - 06-25-2014 Yes, that tool looks right. If you are lyckty that could be enough. Try that first. Might need cleaning of sealing surface. If you are unlucky sealing surface between head and prechamber might have been damaged and in need of maching and a shim. RE: om605 strange noise from back injector - barrote - 06-26-2014 well, if sealing bed and treads are still ok, wich i think so, u can use loctite high temp , the black one, if u can get it somewhere, or cheaper and best exaust glue, that white stuff used to seal exaust piping. whether is your choice, sealing bed must be clean, and the treads free from that "glue" . tightning torque is 40 n/m. regards RE: om605 strange noise from back injector - RickyE - 06-29-2014 cheers for the advice, the splined tool arrived yesturday, got the rocker cover off and tightened it back up, its now running perfectly, no more annoying noises or anything, best its ever ran tbh cheers for helping me out