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  #1  
Old 04-07-2015, 07:36 AM
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OM642 glow plug replacement

Well my wife's nearly 2 years of issue free driving on the ML has hit a snag. Got the lingering glow light, CEL, and P0675 (#5 glow plug failure).

The timing is pretty good, we've hit "almost summer" here in Columbia and so it is still starting ok.

However when I went to search for how to go about replacing the glow plug it appears that the chances of it breaking off in the head are very high based on how many sets of tools are out there for extracting the broken GP.

So how many of you have had experience with changing one of these out?

I contacted our local dealer yesterday and they said, we'll have to get back to you and I'm still waiting for a call back.

Anyone?

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech
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  #2  
Old 04-07-2015, 08:59 AM
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looks like you are the guinea pig... We are looking forward to pics!
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #3  
Old 04-07-2015, 10:28 AM
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That is what is making me concerned. If it was just as simple as lubricate, warm engine, and limit the torque, I would be willing to try. But the tales I have read of them snapping off at very low torques has me scared to even put a wrench on it.

Also I have read that GP failure on these engines is bad while running, which is not like the older IDIs. CDIs use the plugs during the drive cycle for DPF regen and having a failed GP can cause accelerated carbon buildup in that cylinder.
__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech
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  #4  
Old 04-07-2015, 10:31 AM
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Only a few have a OM642 so I would not expect a lot of info.
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  #5  
Old 04-07-2015, 10:31 AM
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Can't wait to see it. I bet they come out like butter. Knocking on wood. Did they put ceramic plugs in those?
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  #6  
Old 04-07-2015, 10:40 AM
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Yep ceramic plugs, which makes it all that much more risky...plugs are like 6 inches long and have 3/4 of the length as the element.
__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech
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  #7  
Old 04-07-2015, 10:51 AM
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Here is a pic of a GL320 CDI Glow Plug. I think these are 10mm and thinner they the GPs on other Engines. It also looks a lot longer.
Hopefully Mercedes applied some to the threads and maybe the body of the Plug before they installed them.

Glow Plug Reamer? I have seen them on eBay in a set but have never looked for one individually as I don't have a Vehicle that I would need it for.

About 3 Years ago one of our Members bought the set of 3 Glow Plug Reamers. It has for the Pencil 617 type, longer 606 type and it had the 10mm Reamer in the set. He did not need the 10mm. If so I hope he sees this thread.

If the Cylinder Heads on the OM642 are Aluminum the long skinny Glow Plug looks like it could possibley be more trouble to get out then the OM606 type ones that are 12mm.

If the Cylinder Heads are Iron they may come ou easy.

People seem to have had better luck removing them when the Engine is hot. That is only partly possible if you have a lot of stuff to remove to get at the Glow Plugs.
Attached Thumbnails
OM642 glow plug replacement-om-642-glow-plug-0011596601.jpg  
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Last edited by vstech; 04-07-2015 at 11:05 AM.
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  #8  
Old 04-07-2015, 11:07 AM
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Quote:
Originally Posted by jay_bob View Post
That is what is making me concerned. If it was just as simple as lubricate, warm engine, and limit the torque, I would be willing to try. But the tales I have read of them snapping off at very low torques has me scared to even put a wrench on it.

Also I have read that GP failure on these engines is bad while running, which is not like the older IDIs. CDIs use the plugs during the drive cycle for DPF regen and having a failed GP can cause accelerated carbon buildup in that cylinder.
if this is true, I'd not wait long... carbon is what makes the plugs difficult to remove...
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #9  
Old 04-07-2015, 01:44 PM
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1st thing to get before you start the replacement is ... antiseize !

2nd thing would be some Kroil. Proven to be better than PB. Using that the night before is preferred too.
Penetrating-Lubricating Oils

For touchy items like this ...a rocking move with your ratchet is good.

Very slightly tighten.. yes... I said tighten. That helps loosen things up. Very slightly = 1/64th ratchet turn. Loosen 2 or 3 ...64ths .. SPRAY Kroil. Retighten 3/64s. That should loosen things up to get it out.

If not, spray and let it soak for ~5 minute. Repeat until they come out easily.
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1992 940T

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  #10  
Old 04-07-2015, 03:51 PM
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From what I have read, they are less of a problem then 606 plugs.

Here is a video of a 400CDI : https://www.youtube.com/watch?v=mon6IhRPFsk


And here is an un-concluded thread : Changing Glow Plugs on a CDI
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2012 S350 BlueTEC 4Matic
2007 ML 320 CDI
2007 Leisure Travel Serenity
2006 Sprinter 432k
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1998 SLK230 (teal)
1998 SLK230 (silver)
1996 E300D 99k, 30k on WVO
Previous:
1983 240D, on WVO
1982 300D, on WVO
1983 300CD, on WVO
1986 300SDL 237k, 25k on WVO (Deerslayer)
1991 350SDL 249k, 56k on WVO - Retired to a car spa in Phoenix
1983 380 SEC w/603 diesel, 8k on WVO
1996 E300D 351k, 177k on WVO

Last edited by GregMN; 04-07-2015 at 04:04 PM.
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  #11  
Old 04-07-2015, 05:05 PM
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Got the quote from the dealer - they will change all 6 and the controller for $1400. Or 1 for $650. Might as well do all 6 and get it over with.

I can't take the risk of breaking her car, with my work schedule and my constant travel out of town for work.
__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech
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  #12  
Old 04-07-2015, 05:20 PM
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Seems like high cost for job. How many hours are they saying the job will be?
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'95 E300, 216k miles, Silver Surfer
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'07 S550 4matic, 69k miles

Gone but not forgotten:

'76 300D, 350k miles?, SOLD in 1995
'75 240D, 300k miles, SOLD in 1991
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  #13  
Old 04-07-2015, 06:48 PM
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Sorry but $1400 for ~30 minutes work is just plain a ripoff.
__________________
1985 300D 198K sold
1982 300D 202K
1989 300E 125K
1992 940T

"If you dont have time to do it safely, you dont have time to do it"

"The democracy will cease to exist when you take away from those who are willing to work and give to those who would not."
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  #14  
Old 04-07-2015, 07:44 PM
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Quote:
Originally Posted by jay_bob View Post
Got the quote from the dealer - they will change all 6 and the controller for $1400. Or 1 for $650. Might as well do all 6 and get it over with.

I can't take the risk of breaking her car, with my work schedule and my constant travel out of town for work.
Does that Cost incude what they need to do of one of more of the Glow Plugs break? I bet that would be extra.
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  #15  
Old 04-07-2015, 08:25 PM
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Call braden...

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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