Here is the Pre-camber Tool set I made.
The puller has 22 x 1.0 external Threads (just like the Shimo Bicycle Hub Puller that people modify to make a puller) and is threaded inside for 5/8 x 18 threads pre inch and will fit the largest Slide Hammer that you can rent for Free at Auto Zone.
The Pre-chamber Ring Removal and installing tool is made so there is no possibility the tool will jump out of the slot.
The Steel is from a Grade 5 Bolt.

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84 300D, 82 Volvo 244Gl Diesel

My 1987 OM603 engine uses the older notched type retainer collar and the straight (vertical) injectors. The splined retainer and angled injectors were changed about the same time as the -14 heads were replaced with higher casting numbers.

My -14 head is still alive after being resurfaced. It had no cracks and leaked only because the head gasket failed.

Also, the OM603 manual does not mention or show seal rings under the precombustion chambers. Mine had none and sealed fine.

I bought the shiny chromed version of the -0007 tool and it was well worth the cost to avoid destroying the collars!

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After the resurfacing of the Head was the Prechamber protrusion still acceptable?

While it does not show Prechamber seal/spacer rings on the stock setup;
I looked in the Manual and if you use the special cutter to resurface the sealing area of the Prechambers they make 3 sizes of Seal Rings.

I am speculating that if the Prechamber protruding out too far from resurfacing the Head you would also have to use the Spacer Rings.

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84 300D, 82 Volvo 244Gl Diesel

Aw dang! I wish I saw this before I went to all the trouble to make that adapter I was talking about! HAHA, oh well it was a good machining experience. Can you machine metric threads now?

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'82 240D 224K miles manual transmission
mods: wooden 4by4 bumper, EGR delete and older EX manifold without EGR port, glass pack muffler (cheapest replacement muffler), rebuilt bosch injectors with Monark nozzles

working on: aux electric fuel pump, coolant/fuel heat exchanger/filter head, afterglow, low oil pressure buzzer/LED

Gaining experience making something is always more interesting than buying something. And, you can use that experience later on something else.
What I was amazed at is that in the US with the exception of the Bicycle Hub Puller nothing else I could find seems to have the M22x1 external threads and the same with the M24x2 threads on the Prechamber Ring Tool.
I think I would need a different gear set to thread Metric Threads on my Lathe.
Also my last training was 2 semesters of High School Machine Shop in 1968-69. And, I was awful at threading on the Lathe then.

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84 300D, 82 Volvo 244Gl Diesel

What did you make the pre-hamber puller out of? Did you order M22x1.0 threaded stock internationally and then drill and tap out the center of it?

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'82 240D 224K miles manual transmission
mods: wooden 4by4 bumper, EGR delete and older EX manifold without EGR port, glass pack muffler (cheapest replacement muffler), rebuilt bosch injectors with Monark nozzles

working on: aux electric fuel pump, coolant/fuel heat exchanger/filter head, afterglow, low oil pressure buzzer/LED

It is made for part of a 7/8" grade 5 Bolt. I reduced the OD on my Lathe and used a M22x1 Die on the external threads and Drilled and tapped the internal threads for 5/8x16" to fit the Slide Hammer.
I am not sure the work involved is worth the effort when the Factory Made Tool is around $30 plus the shipping.
I made it the way I did so that the free AutoZone Rental Slide Hammer could be used (the same as my own Slide Hammer).
As, the Factory Made Puller I have is threaded for a Metric slide Hammer and I had to make an adapter to fit my own slide Hammer.

The M24x2 is a coarser thread and is easier to do with a Die

I have no idea where I would get any threaded Rod overseas and if I could find some I need it in such small quanities that it is not viable.
I also do not know what Coustoms Duties would need to be paid.

The good news is that the Puller I made works. One of our members in Long Beach had a Cracked Head that still had the Prechambers in it. So I set up a meet and took my Home Made tools and I also tried one of those Modified 7/8 sockets.
The 7/8 Socket with only tabs that fit in the slots did not work; jumped out of the slot.
My Ring Remove and the Puller worked.
I had to use the very first Prechamber Ring Removal Tool I made as it was all I had left.
It works the same but does not look like the one Pictured in this thread and that was previously sold.

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84 300D, 82 Volvo 244Gl Diesel

pic for samboyellowsub

This is the 1/2" Drive 7/8" Socket upgraded with parts to hold it into the Prechamber Ring slot.
I have gone this direction with the tool because it was time consuming to cut the Hex on the tool in the previous Thread and the other alternative was to Weld the Hex on as I did with the firt 2 tools I made.

Welding works but my welding is not pretty and it exposes the tool to some heat. The heat may or may not cause a problem.

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84 300D, 82 Volvo 244Gl Diesel

The book specs are 7.6mm to 8.1mm and even after resurfacing, I have less than 8mm of protrusion. After cleaning all the parts, the seal is perfect.

As soon as I get my new retainer rings, I'll put it all together!

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Ive made homemade tools before for these cars but this prechamber collar seams a bit tricky (with the type of fastener involved and the tourque). Heres a link to where the actual tool can be purchased

http://www.samstagsales.com/mercedes.htm#diesel

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1981 300SD 512k OM603

And a few months later I still haven't posted those pics...

The prechamber puller is the same as dieselheads.

I used the bicycle sprocket removal tool.

But the prechamber collar removal tool is completely unique, and works very well.

It consists of a large size nut with a large cotter key set into the nut with bevels
cut on everything to seat down into the collar well.

Wish posting pics was not such a pain for me.

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When the power of love overcomes the love of power the world will know peace.
Jimi Hendrix

this? http://www.samstagsales.com/mercedes/mb615589000700z.jpg

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1981 300SD 512k OM603

Could you have used an injector body's M22x1 thread to make the special tool?

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

NO.

The injector body coarse threads screw into the collar that holds/compresses the pre-chamber.
The pre-chamber threads are a fine/machine thread.

Actually some you can't and some you can!

You can make use of a nozzle holder/injector body if it is the inclined injection type found on OM602.962 and OM603.971 turbo engines 201-87 190D Turbo, 124-90 to 93 300D turbo, 126/140-91 to 95 300SD/SDL turbo cars. These engines use the 5 degree inclined injection system which has its nozzle holders/injector bodies that have M22X1 thread which threads directly into the prechamber itself. These are most easily distinguished by the finer threads nearer to the end of the nozzle holder/injector body and the smaller injection line connection which uses the 14 mm nut.

I stand corrected on this! You would only be able to use an inclined nozzle holder to fabricate a puller for inclined prechambers. D911 is correct on the threading of none inclined injectors and there corresponding prechambers! Thanks!