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PeachParts Mercedes-Benz Forum (http://www.peachparts.com/shopforum/)
-   Diesel Discussion (http://www.peachparts.com/shopforum/diesel-discussion/)
-   -   Do I really need to use the glow plug reamer tool? (http://www.peachparts.com/shopforum/diesel-discussion/391742-do-i-really-need-use-glow-plug-reamer-tool.html)

vonsmog 02-26-2018 08:47 AM
I made my own by taking a 7mm drill bit and drilling out an old glow plug. then set the length at just past a new glow plug and welded the threads to the drill bit. Now I just thread in till it bottoms out the threads. I ream out any time I pull a glow plug, as it only takes a few seconds and they come out much easier and cold starts are much better after reaming.

funola 02-26-2018 09:25 AM
If you're gonna make one, a drill bit is the better way to go.

1. You drill the hole in the glow plug with the same bit

2. It has more chip clearance than a reamer. I.e. it can hold more carbon.

3. A drill bit cuts into the carbon better than a reamer.

pimpernell 02-26-2018 09:28 AM
Quote:
Originally Posted by tangofox007 (Post 3791542)
If someone chooses a drill bit that is too large to fit in the hole and they are unable to figure that out, their life is probably filled with "bad effects." They should leave the hood in the closed position.
If your going to do the job, DO IT RIGHT!!! Its like a guy doing delivery valve seals using a torque wrench by feel instead of using a proper tool.


https://www.youtube.com/watch?v=4i7GerLZxRY

vwnate1 02-26-2018 09:48 AM
Glow Plug Service
 
Thanx for all the good replies .

I have a set of reamers, I hope one is the proper 12 X 1.25 MM .

I too was lazy and didn't do this important service when I replaced my glow plugs, as mentioned normal carbon buildup causes shorter glow plug life although you may it have had it yet happen .

dinman 02-26-2018 11:12 AM
Not to stir the pot and say you don't need to- but on my '83 300d with 250k+ miles (broken odometer) and an entirely unknown maintenance history, i did not ream the holes. All of my glow plugs backed out with no issues, as with going in. i had two dead plugs- one that simply would not glow at all and one that the end melted off of and destroyed the prechamber and injector. I believe the prev owner said he used ether to start it so maybe that did it.

strelnik 02-26-2018 12:02 PM
Quote:
Originally Posted by Clemson88 (Post 3791525)
When I reamed the holes on my 84 300SD and had trouble getting the reamer in. It had 250K on the engine and I have no idea if previous owners had ever cleaned the holes. I bought a reamer and I'll run it in the holes every time I pull the glow plugs.

Imo, you're rolling the dice by not reaming those holes. If you care for your injector system properly renting a reamer from a member here may be the right way for you to go. I have no idea how often reaming holes needs to be done. I just know that I'm never going to have issues getting plugs out or putting them back in.


Use of the vehicle is definitely another factor.
If the car gets long distances at higher speeds, like my 240/300 cars do-- probably not an issue.


Each one of my cars gets at least one 1000 mile trip per month, except the HMMWV engine in the truck, but that one gets periodic multi-thousand mile trips.


I worry more about carbon buildup in the gassers that are not used so much, or the 1950 170D

funola 02-26-2018 12:06 PM
Quote:
Originally Posted by pimpernell (Post 3791678)
If your going to do the job, DO IT RIGHT!!! Its like a guy doing delivery valve seals using a torque wrench by feel instead of using a proper tool.


https://www.youtube.com/watch?v=4i7GerLZxRY
I watched Kent's video. Looks like he copied Mercedes's (poor) design of using a reamer as the cutter instead of a better design- a drill bit. A drill bit will cut into the carbon better and funnels more carbon into the flutes. A reamer will tend to push more carbon into the pre-chamber. This is my opinion of course.

Diesel911 02-26-2018 02:34 PM
1 Attachment(s)
Quote:
Originally Posted by funola (Post 3791760)
I watched Kent's video. Looks like he copied Mercedes's (poor) design of using a reamer as the cutter instead of a better design- a drill bit. A drill bit will cut into the carbon better and funnels more carbon into the flutes. A reamer will tend to push more carbon into the pre-chamber. This is my opinion of course.
Just my opinion.
Actually the stock mercedes type reamers have been doing their job for a long time now. I have never seen a thread on any of the Mercedes forums that I used to visit where someone had issues with the Stock type Glow Plug Reamer.

As you thread the stock reamer in the the crud gets pushed to the rear and there always seemed to be extra room in the rear when you were done.

If you think the older stock reamers were not effective look at the new Hazet ones that are likely a lot more expensive.

Diesel911 02-26-2018 02:43 PM
1 Attachment(s)
Quote:
Originally Posted by funola (Post 3791760)
I watched Kent's video. Looks like he copied Mercedes's (poor) design of using a reamer as the cutter instead of a better design- a drill bit. A drill bit will cut into the carbon better and funnels more carbon into the flutes. A reamer will tend to push more carbon into the pre-chamber. This is my opinion of course.
When I made and sold Glow Plug reamers in the past (I don't do it any more) I found a reamer that was not only cheaper but had more cutting edges, flutes (grooves) land a spiral. In the pic you see the reamer, my version of the Glow Plug Reamer, a Glow Plug and the stock type Glow Plug Reamer.

CDTurbo001 02-26-2018 07:59 PM
"The" reamer, no, but something that accomplishes that purpose, very much so.

tdoublenastywitit 02-26-2018 09:42 PM
So we have come to the conclusion that a 7mm drill bit is better than a reamer??

Diesel911 02-26-2018 09:54 PM
Quote:
Originally Posted by tdoublenastywitit (Post 3791915)
So we have come to the conclusion that a 7mm drill bit is better than a reamer??
It is one of the items that works.

pj67coll 02-26-2018 10:42 PM
I'm happy I'm so rich I can afford Kent's reamer. One of the luxuries in life a millionaire can apparently afford which is evidently out of reach of the little guy:D

- Peter.

jake12tech 02-26-2018 10:55 PM
A drill bit isn't better than a reamer. Spend the actual $50 on the Hazet reamer. If you don't want the plugs to eventually weld to the head and break, get a reamer. If you're selling the car and don't care about the next guy have at it. Cutting corners on a drill bit instead of buying the tool that is designed for your engine to me is bizarre. You got a Benz why not spend the money and do it right. Especially an old antique like a w123. I'm all for custom tools and stuff but with something like that, do it right and spend the money on the right tool.

tdoublenastywitit 02-27-2018 07:05 AM
Only because pretty much everyone on here says they use a drill bit and not a reamer


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