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  #16  
Old 02-21-2018, 06:56 PM
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I think so could be head removal and machine shop next

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  #17  
Old 02-21-2018, 07:03 PM
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Quote:
Originally Posted by 903hblue View Post
Wait, won’t the threads on the head be screwed, since you think the lock ring was cross threaded?
You haven't provided pictures or a followup to tell any of us what's screwed up. Are the threads in the lock ring boogered up? I mean looking in there will tell you real fast... If they aren't, see if the lock ring itself is sitting cock-eyed. If it is, I'd suggest taking the head to a machine shop and having the issue corrected, you'll have possible other damage if it hasn't been locked down correctly.
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  #18  
Old 02-21-2018, 07:11 PM
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Ok, so I realized there would no where for the end of the tap to go.
So, if I am understanding correctly, I would remove the lock ring (without removing the pre chamber) and replace it, and all would be well?
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  #19  
Old 02-21-2018, 07:13 PM
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Sorry, replied too quick.
The lock ring itself is sitting cock eyed.
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  #20  
Old 02-21-2018, 07:35 PM
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Get the lock ring out and see if the threads in the head are stripped. If they are, it may be time to visit a machine shop...
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  #21  
Old 02-22-2018, 06:10 AM
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Cross Threaded Lock Ring Threads...

I had an OM602 head with cross threaded lock ring threads. I purchased the correct sized tap and attempted to clean up the threads. Your best bet would be to have a properly equipped machine shop correct the problem. I gave up on my attempt before I did irreparable damage. Another forum member now has that head. I hope they’ve been able to get some use out of it.
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  #22  
Old 02-22-2018, 10:33 AM
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Does your Prechamber Retaining/Lock Ring have slots like the one in the picture?
If you have the slotted Lock Ring the threads that hold the Injector in are on the inside diameter of the Lock Ring itself and simply removing the old ring and installing a New Lock Ring will give you brand new threads.

An other issue can be is that the Heat Shield only goes in, in one direaction. When you drop the Heat Shield into the hole they tend to flip over one or more times. You need to get a strong flashlight and take a look inside to be sure the right side is pointing up.

The rounded side of the heat shield goed down.

Also if the heat shield is leaking if you pull out the Injector and wipe the very bottom sides if the Injector off with a white Paper Towel you will find it has a thing coating of light dry carbon on it (you would need to drive a while for the carbon to show up).

What have you been torqueing the Injectors down to. I beleive on my year and model it is about 57-59 foot pounds of torque. The Prechamber Locking Ring even higher
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OM602 Injector Thread Tap-slotted-prechamber-retaining-ring.jpg  
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  #23  
Old 02-22-2018, 11:21 AM
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The lock rings on my 602 have the splines, not the slots.
I was careful to get the heat shield in properly. As a matter of fact, when I pulled the injector it did have a layer of carbon on the end of the nozzle. Seems like the injector is not sealing properly at the heat shield.
It's weird that before I replaced my nozzles I never noticed the leaning injector (probably because it's hidden under the intake crossover) and there was no air surging out.
This is really a stretch, but I wonder if double stacking heat shields might work? Since it seems the injector is not reaching far enough.

I will sell the car before having the head removed.

Quote:
Originally Posted by Diesel911 View Post
Does your Prechamber Retaining/Lock Ring have slots like the one in the picture?
If you have the slotted Lock Ring the threads that hold the Injector in are on the inside diameter of the Lock Ring itself and simply removing the old ring and installing a New Lock Ring will give you brand new threads.

An other issue can be is that the Heat Shield only goes in, in one direaction. When you drop the Heat Shield into the hole they tend to flip over one or more times. You need to get a strong flashlight and take a look inside to be sure the right side is pointing up.

The rounded side of the heat shield goed down.

Also if the heat shield is leaking if you pull out the Injector and wipe the very bottom sides if the Injector off with a white Paper Towel you will find it has a thing coating of light dry carbon on it (you would need to drive a while for the carbon to show up).

What have you been torqueing the Injectors down to. I beleive on my year and model it is about 57-59 foot pounds of torque. The Prechamber Locking Ring even higher
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  #24  
Old 02-22-2018, 11:24 AM
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Quote:
Originally Posted by oilslick View Post
I had an OM602 head with cross threaded lock ring threads. I purchased the correct sized tap and attempted to clean up the threads. Your best bet would be to have a properly equipped machine shop correct the problem. I gave up on my attempt before I did irreparable damage. Another forum member now has that head. I hope they’ve been able to get some use out of it.
Damn, this is not encouraging. Was the proper tap M22-1.5?
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  #25  
Old 02-22-2018, 12:17 PM
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m22 is the injector sounds like you need the retaining ring thread size will be the same for slotted or your spline ring.
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  #26  
Old 02-22-2018, 01:55 PM
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Quote:
Originally Posted by 903hblue View Post
The lock rings on my 602 have the splines, not the slots.
I was careful to get the heat shield in properly. As a matter of fact, when I pulled the injector it did have a layer of carbon on the end of the nozzle. Seems like the injector is not sealing properly at the heat shield.
It's weird that before I replaced my nozzles I never noticed the leaning injector (probably because it's hidden under the intake crossover) and there was no air surging out.
This is really a stretch, but I wonder if double stacking heat shields might work? Since it seems the injector is not reaching far enough.

I will sell the car before having the head removed.
In the picture of the tip of the Injector Nozzle you seen the blackend area. If you look cloesly you will see that the metal is actually burned away because th face of the Injector Nozzle is supposed to be flat.

If the area is burned out as in the Pic it is possible for the burned out area to prevent the heat shield from sealing.
Attached Thumbnails
OM602 Injector Thread Tap-injector-nozzle-burned-up-end-blow-up-d.jpg  
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  #27  
Old 02-22-2018, 04:22 PM
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Quote:
Originally Posted by Diesel911 View Post
In the picture of the tip of the Injector Nozzle you seen the blackend area. If you look cloesly you will see that the metal is actually burned away because th face of the Injector Nozzle is supposed to be flat.

If the area is burned out as in the Pic it is possible for the burned out area to prevent the heat shield from sealing.
Wow, I don't think mine is at that extreme yet, but I will check.
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  #28  
Old 02-22-2018, 05:54 PM
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Quote:
Originally Posted by 903hblue View Post
The lock rings on my 602 have the splines, not the slots.
Are ALL of your lock rings the same way? I only ask because the splined lock rings are for the "oblique" injection, which has the injector sit at an angle to the prechamber. The slotted lock rings are for the "vertical" injection which has the injector sit square with the prechamber. If you have a mix of prechambers going on, it's possible for a lone oblique prechamber to look out of place!

If they're all the same, get the tool to remove the wonky lock rings and analyze the head condition. If the threads are ruined, time to have the head worked on or source a new head. If you're lucky, they'll be salvageable. No doubling up of heat shields or any other "trick" is going to correct the problem.
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  #29  
Old 02-22-2018, 07:52 PM
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No, only injector #3 is leaning too much. All the other ones are at the normal 5 degree angle or whatever. Pictures soon, haven't been able to get to it.
I ordered the spline socket, so I will remove the lock ring and examine further.
Quote:
Originally Posted by Diseasel300 View Post
Are ALL of your lock rings the same way? I only ask because the splined lock rings are for the "oblique" injection, which has the injector sit at an angle to the prechamber. The slotted lock rings are for the "vertical" injection which has the injector sit square with the prechamber. If you have a mix of prechambers going on, it's possible for a lone oblique prechamber to look out of place!

If they're all the same, get the tool to remove the wonky lock rings and analyze the head condition. If the threads are ruined, time to have the head worked on or source a new head. If you're lucky, they'll be salvageable. No doubling up of heat shields or any other "trick" is going to correct the problem.
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  #30  
Old 02-23-2018, 02:24 PM
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Ok, so here is a pic of the leaning injector. Very interestingly, I removed the injector and the heat shield was broken! What I think is happening, is that I am actually OVER torqing the injector, since it’s at too harsh an angle it is making contact faster. I am going to re install the injector with a new heat shield, and try slightly less torque. Yikes, what an ordeal! Thanks everyone for their input and help!
Attached Thumbnails
OM602 Injector Thread Tap-d43fcbb7-9de0-4a17-bb7d-0f0b4915061b.jpg  

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