Why are these bloody things so expensive? $90? Really?

Someone please enlighten me on what must be an arduous process of manufacturing these things.

Reamers for old engines are a half as much partly due to people having one already or borrowing one from a friend. The patent protection has expired on them long ago so there are more than one company making them now.

Maybe the demand for the newer style is high or the supply is low. It's all economics.

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84 300SD
85 380SE
83 528e
95 318ic

Actually, I'm looking for one of the large sized ones. I have a 77 240D I'd like to clean out when replacing the plugs.

You need to say which Engine the Reamer is for!

There is actually 4 ramers available for different engines/glowplugs

There is one for the loope/filiment type glow plugs.

One for the pencil type glow plugs that as an example work on my 1984 300D.

Then there is a longer one for the 606 Engines

Then there is one for the newest Mercedes diesels that is the thinnist of the bunch.

You don't need to buy the most recent Hazat Reamers. The older style ones work fine and can be had on ebay or maybe amazon.

The tumbnail is a pic of the older style Glow Plug Reamers. The sort one is for 617-952 engines (cost around $37) and 240D engines from the 1980-1985.
The longer one is for the 606 engines (cost around $62) but not the indirect injection Engines. Both reamers have 12mm threads.

There is no older style reamer for the indirect injection engines that have 10mm threads on the glow plugs that I have seen.

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84 300D, 82 Volvo 244Gl Diesel

I saw one for 50 online
You just gotta shop around, I'm sure there are even cheaper ones than that.

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1974 240d
1983 240d -sold
1989 420sel with om606
1994 s350 turbodiesel - sold

The later om617 pencil glow plug reamers are the same to use on om601/2/3?

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97 e300d, 78 300Dt, 95 E300d, 94 E320 estate

If this is the vehicle you Have : I have a 77 240D W123 Automatic." is Engine 617.912.

That needs a reamer with 18mm threads and that reamer is harder to find and more expensive.

There is a thread somewhere where I posted the Shot Gun Cleaning Brush sizes. I am sure a stainless Steel Shot Gun cleaning brush would work fine.

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84 300D, 82 Volvo 244Gl Diesel

The engine in my 77 240D is a 616.912. So, I need one of the larger reamers.

Diesel911, I'll look for that thread, although, I'm a touch paranoid about a bristle breaking off in there.

I've got the entire set of MB reamers

they don't do any better of a job than a well greased drill bit wiggled around by hand...

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Allen Kroliczek
Oak Grove Autosport | Oak Grove Autosport
01 G500, 82 300TD, quite a few more.....

And there are threads on how to make a reamer out of an old glow plug and drill bit.

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.

Do a Google Image search for Diesel Injector Tube Brushes.

In the pic is an example of some of the used on direct injection truck engines. Note the wire bristle brushes.
Where I worked the handle was removed and the brush was chucked up in a Drill Motor and you shove the brush down the Injector Tube and gave the drill motor switch a few squeezes and pulled the brush out.

We had compressed air and a air gun that had a long needle nozzle on it. We stuck the air nozzle all the way into the combustion chamber and gave it a long shot of compressed air as we slowly pulled it out. See the red arrows.

Also there is only 4 or 5 small holes at the bottom of the pre combustion chamber.
In 18 years as a diesel mechanic I never witnessed or had someone tell me that wire bristle damaged their Engine. And, the bristles do come off especially if you use a Drill Motor to turn the Brush.

Also the bristles on the Injector Tube Brushes are a whole lot thicker then the ones on a shotgun cleaning brush meaning that the real injector tube brush bristle is thicker and you would think more likely to cause damage.

In short if using injector tube brushes was a issue they would not be on sale.

So if you follow the procedure in the service manual of cranking the Engine after you ream to blow out anything in the pre combustion chamber that should take care of any issues.

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84 300D, 82 Volvo 244Gl Diesel

I've got a nice universal mounted reamer for the 18mm glows...

it's in the rental forum, just drop me a PM.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

I picked up a used 9/32 inch reamer, to use on my 82 300D-T (OM 617.952 engine) at a local tool shop, for about $4.00. Haven't tried it out yet, though.

I don't think you have to spend a whole lot of money, unless you want to. There have been threads here which show how to do it with a drill bit.

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Marshall Welch
Seattle, WA
1982 300D-T

The factory made reamer size is 7mm on your engine.

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84 300D, 82 Volvo 244Gl Diesel

I just used a tap from my metric set. Hardly any carbon came out on it and the pre-chambers looked clean when I have had the injectors out, so doesn't seem like reaming is needed on my two OM617 engines.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans