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  #1  
Old 08-06-2020, 07:02 PM
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Om603 injector/precup seal?

I've fixed my overheating issue but found this along my travels. 5 of 6 cylinders are blowing bubbles around the injectors. Hard to say but it actually looks like it's blowing around the ring the injector seats in. As far as I know that is the pre combustion chamber cup. I've never had one out so I don't really know what's going on there. Is there a seal to replace like crush washers or something? Or Is it just loose or destroyed? I'm guessing there's a special tool that fits the two grooves to remove/tighten them? Seems to be coming from right at the little circular machine mark on all of them. You can see the bubble kinda in the pic.

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Old 08-06-2020, 07:15 PM
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Use the pelican parts site to look up what the part looks like and they usually have the part number.

However if any sort of liquid gets down inside of the threads it is typical to see some mild bubbling. It in normally is not leaks. No one has proven one way or another but I think there is a shock from the fuel injection that causes vibration that creates the bubbles.

Getting Brake Cleaner, Carburetor cleaner down in there to dilute and float out the lighter stuff and the mentioned items evaporate will eventually leave the level too low to bubble out.
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Old 08-06-2020, 07:23 PM
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There shouldn't be any fluid in that area unless you spilled it. Liquid that gets down in there will boil off and can bubble, it's normal. Don't read too much into it. If you didn't spill the fluid down there, fix your leaks.
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Old 08-06-2020, 07:35 PM
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Quote:
Originally Posted by Diseasel300 View Post
There shouldn't be any fluid in that area unless you spilled it. Liquid that gets down in there will boil off and can bubble, it's normal. Don't read too much into it. If you didn't spill the fluid down there, fix your leaks.
Typically there has been an Injector fuel return hose leak or valve cover gasket leak at some past time.
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Old 08-06-2020, 07:52 PM
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No I dumped water down there. I did it by accident the first time while cleaning up oil after cracking the lines testing cylinders at idle. I can definitely see some buildup of crap down on top of the rings. One cylinder is not bubbling. I can't believe it's bioling because it's instant on a less than 80° engine. So is the general consensus that it's ok to see bubbles from here? Its not chuf chuf chuf or hissing or anything. I guess I'll clean the greasy crap out of there and see if it changes anything.Only really reason Is im trying to decide if it's worth trying the 65$ Blu devil headgasket in a bottle. It worked on my buddy's truck with a minor cylinder leak. If I can make the pressureized for days cooling system stop I'll rebuild the injectors. Whatever crack or gasket issue is so minor it's not affecting it running or losing water. It's not even over pressurized to the point of pushing water out the overflow. Just leaving pressure in the system after it's completely cooled off. I don't care what anyone says, that's not normal for any engine.

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Old 08-06-2020, 09:28 PM
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So recap on that. I poured water in there to check for bubbles. It's not something I should worry about?

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Old 08-06-2020, 09:45 PM
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No.
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Old 08-08-2020, 12:11 AM
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I like that answer but I'm fairly certain a Mercedes engineer would disagree. But whatever. Its got bigger issues to iron out. So Is a tear down and cleaning of the injectors usually helpful or just find wreckage and know they need nozzles for sure? Idparts says a month for firad sd314 at thier 25$ price. It's like 230 for all 6 other places shipped. Bosch india are fairly cheap and there are no names for 60 a set. Monarks are the same as firad. 217 +shipping.

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  #9  
Old 08-27-2020, 06:47 AM
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Use some compressed air and blow out the area and run it and you will see the fuel leaking if that's what it is.
If its water it will evaporate. If its leaking fuel it will be oily.
Leaking crush washer is unlikely unless it was re-used. They need to be replaced whenever you remove the injector.
Return lines get old and cracked - and don't do well if they've been on and off a few times.
I have found that the hard fuel lines don't seal so easily if the lines aren't positioned correctly on the 603. And they need to be torqued to the correct spec too.

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