glow plug reamer - pic - Page 2 - PeachParts Mercedes-Benz Forum

JamesStein · #1 10-16-2006, 08:24 PM

Further info for the browser who doesn't notice the age of this thread. (like me right before I posted this reply. Ah well, useful info anyway)

Quote:

Originally Posted by adamb

I am of the opinion that if there is enough carbon to be reamed out, then the pre-chamber should come out and be cleaned. This will not be that much more work and the results are far better IMHO.

In theory that sounds good. But the reamer is also cleaning out the head. On my 300CD I recently pulled the injectors and the pre-chambers. The prechambers were soaked for a week in carb cleaner and cleaned extensively. After I put them back in I was having diffilculty installing a glowplug so I wipped out the reamer I had also purchased. It got as much crud out as the original picture and the pre-chambers were clean as a whistle.

Eric Eliel · #2 04-06-2004, 07:06 PM

Using the part number, my MB parts list states a list, wholesale and "cost" at $30.50

Not sure why the list, wholesale and cost is the same (first time I have seen that) but the price at the dealer for this item is not bad.

dabenz · #3 04-06-2004, 11:24 PM

You grease the flutes to catch most of the carbon, then spin the engine with the starter to "puff" the rest out.

1983/300CD · #4 12-21-2005, 08:24 AM

Quote:

Originally Posted by dabenz

You grease the flutes to catch most of the carbon, then spin the engine with the starter to "puff" the rest out.

I've heard the "puff" method theory before, and also heard that if your engine's stroke is opening at that point instead of closing/compressing, you will suck all the carbon right in.

biopete · #5 12-22-2005, 10:10 PM

Quote:

Originally Posted by 1983/300CD

I've heard the "puff" method theory before, and also heard that if your engine's stroke is opening at that point instead of closing/compressing, you will suck all the carbon right in.

Wouldnt it just burn up?? What happens to the carbon you loosen up if you do not blow it out of the prechamber? Doesnt it just get sucked in on the next intake? Maybe it does not really matter about blowing the glow plug hole out,.

I think I saw a broken off piece of a glow plug lying down in the prechamber. Im gonna see what i can pull out of there with a magnet.

Tangent · #6 12-23-2005, 07:58 AM

Take an old bad glow plug and a dremel type-cutting wheel and cut gouges in to
the old glow plug
something like this

whunter · #7 12-23-2005, 05:57 PM

Quote:

Originally Posted by Tangent

Take an old bad glow plug and a dremel type-cutting wheel and cut gouges in to
the old glow plug
something like this

High risk of it breaking off in the head.

Diesel911 · #8 02-07-2008, 04:09 PM

Quote:

Originally Posted by Tangent

Take an old bad glow plug and a dremel type-cutting wheel and cut gouges in to
the old glow plug
something like this

The reamer bit is fatter than the glow plug so it cuts a larger hole than the glow plug tip.

#9 04-07-2004, 02:56 PM

A reamer is a reamer - does it have a dimension marked on it? Knowing that one could then use a standard tool!
Steve

Kestas · #10 04-07-2004, 04:02 PM

The size given by Judge (12 x 1.25) and the picture lead me to believe this reamer is nearly identical to a 1/2" reamer. My Machine Shop Supply catalog lists the reamer for $13.20, though it doesn't have the threads or hex for the fingertips. If wobble (misalignment) isn't a concern, one can save some money by using a standard reamer.

Diesel911 · #11 02-07-2008, 04:08 PM

Quote:

Originally Posted by Kestas

The size given by Judge (12 x 1.25) and the picture lead me to believe this reamer is nearly identical to a 1/2" reamer. My Machine Shop Supply catalog lists the reamer for $13.20, though it doesn't have the threads or hex for the fingertips. If wobble (misalignment) isn't a concern, one can save some money by using a standard reamer.

The 12 x 1.25 is the size of the threaded part of the reamer not the size of the reamer bit. The threads are 12 mm with a pitch of 1.25.

#12 03-19-2008, 02:01 AM

Home made glowplug reamer.
Cost: Nearly free.
Time to make: About 30minutes.
Parts needed: Old glowplug, 1/4" drill bit, hacksaw (or die grinder), vice grips and welder.

Remove the innards of the old glowplug with the vice grips. It takes a bit of work to get the tip out but it will eventually come out.
Drill in the bit until approximately 1" is out the tip.
Cut off the butt of the bit about 1/8" before the body.
Haul out the welder and weld the bit to the body.
Clean off any weld overshoot from the wrench flanges.
Done!

Simple as that, it takes probably 1/2 hour to make one the first time.

The glowplug shaft is 0.24" so the 0.25" bit gives it a little room. I would have tried bigger but I wasn't sure at the time how big I could go. Now that I found this thread I see I could have gone up to a 3/8" bit.