Long story short, two of my plugs flaked on me. Tested all 4 and two never even lit. A lot of carbon on each, figured they literally drowned in the stuff. I need to clear the chambers out, but I'm not about to spend $100+ on a reamer (and Mr. Bergsma is fresh out...figures). This is a 616 with the large-bore loop/series plugs; recently upgraded to parallel.

Need my Benz back up ASAP; not good for the starter/battery trying to crank it in the morning cold with only 2 plugs...only needed for a few days.

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- 1979 W123 240D 4-speed, 390k miles

What brand lugs where you using? Typically with the large opening of the loop plugs, reaming the carbon out isn't necessary. I would imagine you could just go get an assortment of drill bits and use the right size one and a wrench to ream the hole.

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Monarks

EDIT: And call me crazy, but I don't have any drill bits. I'm pretty much needing the actual tool.

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- 1979 W123 240D 4-speed, 390k miles

11 mm diameter inserted no more than 55 mm into the prechamber.

I suspect that if it is truly urgent than you could find an appropriate tool to simulate these dimensions (drill bit, screwdriver, torx driver, allen wrench, chisel, etc., etc., etc.). Put a hose an a shop vac afterwards and vacuum out any chunks of carbon that are in the prechamber. The postage on renting a reamer will be more than purchasing an appropriate alternative.

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1968 220D, w115, /8, OM615, Automatic transmission.
My 1987 300TD wagon was sold and my 2003 W210 E320 wagon was totaled (sheds tear).

Monark glow plugs are garbage, there are many many members who have reported monark glow plugs, swelling at the ends, breaking off and just plain not working. Use Bosch number 80035 glow plugs..

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I went to mcmaster Carr, ordered the metric drill bits I needed, and had them within a day. I'd go that route personally.

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Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (113k)
1991 350SD (206k)
1991 300D (228k)
1993 300SD (291k)
1993 300D 2.5T (338k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (265k)

Past Diesels:
1983 300D (228K)
1985 300D (233K)

No reason why the carbon could not be brushed out:
Use only Stainless Steel or Bronze. You will need to find something for the Handle and I gave the Male Thread Size that is on the Brushes I have.

SHOTGUN BRUSH SIZES; threaded end 5/16x24 inches
10 gauge 0.775"
12 gauge 0.729"
16 gauge 0.662"
20 gauge 0.615"
28 gauge 0.550"
410 bore 0.410"

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84 300D, 82 Volvo 244Gl Diesel

The original Filament/Loop type Glow Plugs can be sorted with Carbon by Carbon build up but I don't think that is possible with the Adapter Pencil Type Glow Plugs.

The only thing I can think of that Carbon build up on the Adapter Pencil types is it would act as an insulator to the heat transfer.

If the adapter type Monark GPs are the same as the Regular Pencil GPs Monark Makes 2 of mine died in 1 years use in S. California; no cold Winter Temps to stress them to the limit. So it could very well be the Brand of Plug.

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84 300D, 82 Volvo 244Gl Diesel