I found a thread in this forum that suggested making a reamer by flattening out the end of an old GP and sharpening the edges.

Sounds do-able to me but my question is: How wide is the hole that I'm reaming? As wide as the threads on the GP?

I'd hate to flatten the old plug too much and damage/get it stuck in the hole. Any ideas? Better yet, how about a photo of the chamber where the GP hangs out!

Thanks guys.

Really?? A proper glow plug hole reamer is not that expensive you know.

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'98 E300 turbodiesel

I believe one of the threads also mentioned using a 7mm drill bit twisted by hand.

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84 300D, 82 Volvo 244Gl Diesel

Oh man, if you have to change glow plugs, God be with you. But I think yours was a W123? Mine's a W124. Big job for those who don't do it for a living.

I was lucky enough to find someone on this forum who sent me his to use. Might want to ask around.

I made my reamer out of a glow plug,I believe I added .040 to the diameter.I used a caliper to measure.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran

In the Service Manual it tells you to use Grease in the Grooves (Flutes) of the Reamer to trap the Carbon. They do not give a special type of Grease.

I use Wheel Bearing Grease becaust that is what I have available.
I tried Vasoline but it is too runny at normal temps.

If any Grease gets in the Prechamber I think it would burn. I am not sure what antiseeze would do. Although, antiseez is less likely to come out of the Grooves.

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84 300D, 82 Volvo 244Gl Diesel

I've done this, worked fine. It was tough to get a good grip on it at times though.

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth

The ingenuity of the forum members here never seizes to amaze me... I tip my hat to ya - great tool.

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1987 Mercedes 300SDL; SOLD
1985 Mercedes 300D; SOLD
2006 Honda Pilot - wife's ride; 122K;
1995 Toyota Land Cruiser - 3X locked; 182K

Is a reamer really necessary?

I stuck a drill bit in there and didn't feel a thing. Unless the purpose it to clean the prechamber walls.

Danny

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1984 300SD Turbo Diesel 150,000 miles

OBK member #23

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