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I'm doing nipple cups and injector seals and noticing there is greasy goop on the injectors between the lower white oring and the nozzle. Does this indicate anything or is it typical? I assume it's really funky oil residue.
When that happens, fuel in the head will drain into the cylinder of the injector you pulled 1st. If by chance you took out the front injector, either #2 on drivers side or #1 on passenger side, it may be to your benefit to either remove the glow plug and use the starter wire with the squeeze connector on the passenger side above the vacuum pump and ac box. Just touch the internal tip to passenger battery post, to purge the fuel from the cylinder before you go firing it up and risk a hydrolock. Just make sure the key is off. There is a youtube video by Dieseltechron that explains this procedure. Who's to say how much fuel dumped in, but its what i would do unless you have a teeny tiny shop vac tip that can go through the cup into the cylinder.
Yeah I just wanted new nipple cups because f the bs and the price difference wasn't that much. Supposedly these will protect the injector seals if the Nike nipple cups ever leak again.
I just got mine in the mail today, doing this weekend. Don't forget to prime the oil rail before you put the valve cover back on. Little 4mm allen screw between stand pipe and dummy plug.
Was that on all 4 injectors ? Kinda looks like sludge, did you have an oil cooler problem before ?
Yup that was on all of them. I did have an oil cooler problem where the job done right before I bought it left oil cooler cover bolts loose so oil leaked in to the cooling system. I don't know any history prior to that.
The stuff almost looks like bearing grease but I'm assuming it isn't; I can't imagine why anybody would grease the bottom of the injectors like that.
Thing is, unless I'm mistaken, the upper seals high pressure fuel away from the oil in the valve cover and the lower seals fuel away from the void in the injector bore. If those seals fail you'd get fuel in places you don't want, but the oil that meets the top isn't pressurized at all, and there shouldn't be any oil that sees the bottom one so if it is oil where the hell did it come from.
I just got mine in the mail today, doing this weekend. Don't forget to prime the oil rail before you put the valve cover back on. Little 4mm allen screw between stand pipe and dummy plug.
I wondered what that was for. Am I going to need a new oring for that or is it a pipe thread deal?
Fuel is fed to the injector between the o-rings, oil is fed between the white o-ring and the bottom of the injector. that looks like sludge in the high side oil system. I swapped an engine in an 08 E350 a few months ago that had 60 degree deltas, found oil at the cooler turned to sludge was 2'' thick. But that was before the HPOP.
Oh there's oil that feeds below the bottom o-ring? I did not know that. That makes a lot more sense then. So this is probably sludgy oil. I haven't found sludge anywhere else though. There wasn't any in the cavity when I did the oil cooler, I don't have any in the valve covers, and Anthony didn't mention sludge when doing the HPOP. So I guess I'll clean it up and not worry about it then. Thanks for the insight!
Oh on a completely different note for you guys that do injectors, how often do you find that there's basically no torque on a hold-down? My #4 was screwed in but there was no torque on it at all.
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