Amazon.com

 

I seen that one but says "Similar to EN-51249, which I cross-referenced to be for 2001-2016. So I think the Amazon description is wrong saying "2001- present". I would assume there is a reason why gm had EN-51249 for pre 2016 and EN-52074 for the L5P? Anyone know the difference?

 

Yeah I dont know. All my previous bookmarks are also out of stock as you said.

 

I'm looking for a little help. 2018 L5P 180K miles and has a code for number 3 glow plug. Thanks to this forum I found quickly it is best to use a glow plug reamer. I have the OEM plugs in hand but I cannot find the reamer. Seems they are out nation wide. Tried OTC, international, Tillman, you name it.... nothing.

Any ideas or anyone have one they would like to sell? I really don't want to risk breaking the new one off in the cylender but I'm running out of options. I do have the reamer on order through international but they say March at best.

Tying to get a feel for a success rate going at it without the tool and this many miles?

I have read it is not good to leave a dead plug in these engines for too long becuse it builds up even more carbon from not buring off the tip and will snap or get stuck in there. Any truth to that? Can I still drive it alot or you agree I should try to use it as little as possible?

Thanks in advance. FYI. Truck starts right up at 10F.

Hello,

I just bought one from freedom racing tool. I signed up for their product stock alert, and it was in stock a couple days later. I don't know if I just got lucky, or they get them in that quickly. Give them a call or email, maybe they can backorder/expedite one for you.
Best of luck.

https://www.freedomracing.com/en-52074-glow-plug-bore-carbon-remover.html

 

Why is that tool so expensive, is there something more to it than what it appears? It looks like a two step cutter, sort of a drill bit with two steps and not a twist cut into it.

 

Not sure but I had a machine shop I would be rich at $180 a pop.

 

Thanks everyone still on the hunt and still looking for info. I will call freedom tomorrow. When I did call OTC the lady immediately knew the part and said good luck and the main manufacturer stopped making them but, there is some other company making them or will be making them so I'm told.

I agree the price is nuts but what is even worse is that GM calls for using them and they are nowhere to be found.

Anyone know the diameter of the glow plug for pre-2016 or have one to measure with calipers? Wonder if the tool from Amazon would work. But again why would gm change the part number.

 

Edit . . . Anyone know the diameter of the glow plug for pre-2016 or have one to measure with calipers? Wonder if the tool from Amazon would work. But again why would gm change the part number.

A little late but this may be useful for someone. Don't see how the reamer would work unless its a bigger diameter than the glow-end but small enough to fit thru the hole.

 

I may be roasted on here... I have replaced 5 of my L5P glow plugs one the last 3 years, I have never used the reamer (didn't even know about it). I have had zero issues with the plugs I replaced. LOL now I have to go but a damn reamer...

 

No roasting at all.
I've read about a few people that have done the same.
Most of the time, it's probably OK.
I had no clue it was a "thing" either until I read about it. Figured, well, let me at least prepare for it.

 

I always like a reason to buy more tools...

 

You can spray some solvent in the hole to break up the carbon and use the old glow plug as a reamer. If it goes in smooth and comes out, the new one will too. Blow it out with shop air after cleaning with solvent before installing the new one. I've been doing it that way on these trucks for the last 20 years.

 

That may not be a bad idea. Maybe I'll grind the threads down to nothing on the old plug so I can "feel" the resistance slidding it in and out? Haven't done one b4 and I assume if there is resistance I might not feel it too much by using the threads to push through? Is the L5P the only ones with porclin? Maybe that's the difference?

 

Well on pre l5p i've never had an issue with the couple dozen or so i've done. Learn something new every day!

 

A lot of people have said that. It doesn't seem to be a "thing" until the L5P showed up.
🤷‍♂️

 

This is all great info. At this point I may pull it out and see how it feels going back in. I can careless if the plug dies quick, just don't want the proclin to crack and drop the tip in the cylender. I'm glad to hear others have had success without the tool on the L5P! Anyone have higher mileage (180k miles or more) and still not have an issue. I have no clue if they have been replaced prior. I bought the truck with 160k.

Thanks again!

 

OP, I have 111,500 on my truck.

 

Just a fallow up. Still waiting on the tool but I took the bad one out. It came out like butter and the new one went in the same. Changed them with the engine up to temp. Good to go.

Thanks everyone!

 

Just a fallow up. Still waiting on the tool but I took the bad one out. It came out like butter and the new one went in the same. Changed them with the engine up to temp. Good to go.

Thanks everyone!

L5P glow plugs require a glow plug learn procedure after replacing.. Don't know how important it is, but if you get more glow plug codes I would have it done.

 

Glad to hear, best of luck.

 

nice, that's how all of mine went as well!

 

I have changed 5 of mine, and never had to do a re-learn.

 

When to Perform the Procedure
Note: Failure to perform this procedure may result in poor system performance, DTCs being set, or customer dissatisfaction.
This procedure is required when the following component has been repaired, replaced, removed, or serviced: E12 Glow Plug...

GM service manual instructions.

 

When to Perform the Procedure edit ... GM service manual instructions.

That would be great information but it looks like to use that link you have to have to create some kind GM or dealer account. How did you get the link to work for you?

 

I realize what the manual says. I am just stating that I have changed 5 and have not run into these issues. It's always best to follow the manual.

 

I hear you.. Just putting information out.

 

What would the "expected" service life of an L5P Glow Plug? I am going to assume it would vary with your winter temps or warmer garage kept? I had an 03 7.3 PSD with 180 on it always outdoors in KY and all of them lasted without a replacement. Are the L5P more prone to wear due to something?

 

Kent Moore EN-51249 is no longer in production. OTC 7223 is the same tool which can be had at Amazon. Plan on spending $194.00 after taxes. I know this because I just bought one to add to my arsenal. OTC 7223 is used on 2001-2016 Duramax engines with the glow plugs that had the older style tips. 2017 had the ceramic tips that required a different reamer.
Another thing to keep in mind is Merchant Automotive sells a remover kit which consists of an air hammer that vibrates the glow plug to help break it free, an attachment to lightly turn with a wrench, and a specially machined socket with a collar that fits the glow plug.
This tool kit is recommended for 2001-2016 Duramax engines. This kit is NOT recommended for later engines with ceramic glow plugs because the vibration can break the tips off and depositing them into your cylinder.
I could not find the reamer tool number that is needed for the 2017 and later Duramax when I checked my tool number records, but I will keep looking. Out of memory, the reamer you are looking for is getting hard to come by.
I will post the tool number if I can find it.

 

OK, this is what I had in my records.
Source: GM Service bulletin #23-NA-032. Date: March 2023.
"Information on servicing diesel engines with ceramic glow plugs.
Silverado 2500 HD/3500 HD. 2017-2023. Engine, L5P.
"The recommended tools for cleaning these glow plug holes are as follows:
6.6 L Diesel, 3.0 L Diesel, and 1.6 L Diesel all use the EN-52074 Glow Plug Bore Reamer.

Note; Whenever replacing a ceramic glow plug on a diesel engine, it is required to use a glow plug hole bore cleaning tool to remove the soot built up on the inside of the glow plug hole. The only exception to this is when servicing a glow plug on the 2.0 L or 2.8 L diesel engine.

I hope this helps.

 

Well, here's what it looks like...

The entire small portion up front is the reamer portion.

 

I have OTC 7223 which is the same AS EN-51249. They look almost identical, with the exception of the tip. EN-52074 looks slightly fatter than OTC #7223.
We can always measure ours with calipers and post the information if that comparative information would help someone.

 

Yes, I would like to know the diameter of the small front tip. As you can see in my post 28 the glow plug tip is 0.142" so I assume the tool's tip would have to be bigger than that to scrub off any debris.

 

Here are the measurements of OTC tool # 7223. You can compare it to EN-52074 when they are posted. The round shaft that starts BEHIND the hex head nut is .322" in diameter. The round shaft is 3.346" long. The HEX HEAD portion of this tool are not included in ANY of the measurements because that portion of the tool does not enter the head and have to do with reach or depth.
The narrow cutter portion meets the end of the circular shaft with a diameter of .1675". At this location, the narrow shaft is simply circular with no cutters ground into the narrow shaft. Cutters begin and have three cutter grooves cut into the shaft. To obtain a correct measurement, I rotated the cutter in a circular motion within the caliper. The diameter of the beginning cutter area is .1665".
The very tip end of the tool has a sharp bevel at the end which I did not measure, but at the end of the cutters (end of the tool), prior to the bevel had a cutter diameter of .1625 which is just slightly narrower than my first measurement. The total length of the narrow part of the tool where it meets the larger circular shaft, to the tip of the cutter is .9865". Adding the narrow cutter shaft length to the larger circular shaft gives the tool a reach length of 4.3185".
Once again, the hex portion of this tool where a wrench is applied is not included in this measurement.

Keep in mind that this tool, OTC 7223 applies to 2001-2016 Duramax engines. This is not the recommended tool for 2017 and later Duramax engines with ceramic glow plugs.

One other thing to think about; Ceramic plugs have a little dimple in the glow plug shaft where the ceramic tip attaches. This dimple obviously increases width.

I hope this sheds a little light on your search. Mike.

 

Thanks, Mike. Good measurement description. That cutter end confirms what I thought. Since the stock tip is about 0.142" diameter, and your cutter diameter is wider than than that, it will "cut" or remove any crap as it is inserted thru the hole. I guess what happens to the debris is how careful one is in doing the job. The tolerance on the stock glow plug are fairly loose. I find that the upper body diameters above and below the threaded area vary 0.008" or .010" and have no effect whatever.

 

Good, I am glad that helped you. This is just out of memory, so give me a little leeway, but I had read GM did not recommend using anti seize because it could throw off torque specs.
Diesel mechanics have posted that you should absolutely use it. COPPER anti seize was recommended above all.
I have a can of copper in my shop. I can give you the brand name if you need to find it.
I am just throwing this information out there. This is your decision.
Let us know how this comes out, and good luck to you.
Mike.