Reamer & reaming chamber - Mercedes-Benz Forum
 
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post #1 of 5 (permalink) Old 07-25-2011, 04:10 PM Thread Starter
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Reamer & reaming chamber

What do you know of:

Mercedes Heavy Duty Carbon Reamer for Pencil Glow Plug Chambers and quality glow plug replacements. I have heard that it is necessary when replacing the plugs.

I found these:

Bosch Glow Plug - Direct OE Replacement
1981-1987 Mercedes Benz 300TD

For $13 ea.
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post #2 of 5 (permalink) Old 07-25-2011, 05:31 PM
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Using a Glow plug Reamer or an alternative method to clean the Carbon out of the Glow Plug Holes increases the life of the Glow Plugs.
On the Engine stated in your Post Bosch or Beru Glow Plugs hold up the best. The Bosch Plugs cost less and are more available.
In the pic below you see on the left my heavy duty all Steel homemade Glow Plug reamer with a 6 Flute (groove) Reamer on the End; and a Factory made Glow plug Reamer on the Right like you can get on eBay or some of the internet part sellers.
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Last edited by 300Dman; 07-25-2011 at 05:42 PM.
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post #3 of 5 (permalink) Old 07-25-2011, 11:52 PM
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You also need the reamer to make sure the hole for the glow plug is correct if you remove and replace the pre-chamber.
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post #4 of 5 (permalink) Old 07-26-2011, 06:34 AM Thread Starter
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Quote:
Originally Posted by Army View Post
You also need the reamer to make sure the hole for the glow plug is correct if you remove and replace the pre-chamber.
What do you mean? Is it necessary to remove the pre-chamber to ream? How would you do that with the head still on and put things back, correctly?

I am also concerned to know how you know when you have thoroughly reamed the carbon out of the hole well enough?
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post #5 of 5 (permalink) Old 07-26-2011, 10:47 AM
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Quote:
Originally Posted by bpjenks View Post
What do you mean? Is it necessary to remove the pre-chamber to ream? How would you do that with the head still on and put things back, correctly?

I am also concerned to know how you know when you have thoroughly reamed the carbon out of the hole well enough?
It is not necessary to remove the Prechamber to Ream out the Glow Plug holes/bores.

Glow Plug reaming.

Below is close to what is written in the Factory Service manual.

Prior to installing Glow Plugs, clean Glow Plug Channels and Bores and Prechambers with a Reamer. For this purpose, fill the flutes (grooves) of the Reamer with Grease and Ream the Glow Plug Channels.
(The Grease traps the carbon particles; you may need to wipe off the Carbon/Grease and re-grease the Reamer if it fills up with too much Carbon.)

After Reaming the Glow Plug channels, crank the Engine Several Times with the Starter Motor, so that the residue is blow out of the Chamber. (Before you do this part tie down the Manual Shutoff so Fuel does not spray out of the Glow Plug Holes when you crank the Engine.)

According to the Mercedes Manual the above is considered good enough to clean out the Glow Plug Holes.

My onpinion concerning the use of a Brush. I do not know if it is a benefit or not. Certainly Mercedes does not mention using a Brush.

You would think that on the way in a Brush would push loose stuff inside of the Precombustion Chamber.

So use your best judgement concerning the use of a Brush.
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