Glow plug E-class CDI - PeachParts Mercedes-Benz Forum

amolak · #1 05-24-2005, 10:06 AM

Hi,
One of the glow plugs on my e-class will not come out as the thread is broken.
All the others have been replaced.
The light stays on for a minute on startup, and I get a slight misfire for about 5secs on start up.

Will this cause damage to the engine?, or is it ok to live with?

I dont really want to pay £2k to have the engine stripped.

I heard that CDis dont really need glow plugs anyway.

Pls help
thanks
A

DieselJim · #2 05-24-2005, 10:18 AM

I'm not an expert but I would say a couple of things. Misfires will cause more carbon and crap in the turbo and possibly intakes. My guess is like all mercedes diesels that if you run it on short runs it will be more severe. Long runs are great for these engines. I suspect most Europeans have much shorter commutes then americans but a nice home in the country and commuting into the office still exists there. I don't think it will harm the mechanism of the cylinder. I'm sure there is a way for the Do it yourselfer to get the plug out.

aklim · #3 05-24-2005, 11:23 AM

Got Warranty?

amolak · #4 05-24-2005, 11:25 AM

no it is out of warranty

aklim · #5 05-24-2005, 02:04 PM

I thought the CDI came out this year?

aklim · #6 05-24-2005, 02:06 PM

Quote:

Originally Posted by DieselJim

I'm not an expert but I would say a couple of things. Misfires will cause more carbon and crap in the turbo and possibly intakes. My guess is like all mercedes diesels that if you run it on short runs it will be more severe. Long runs are great for these engines. I suspect most Europeans have much shorter commutes then americans but a nice home in the country and commuting into the office still exists there. I don't think it will harm the mechanism of the cylinder. I'm sure there is a way for the Do it yourselfer to get the plug out.

Been there, done that. There is a way. However you have to be lucky or damned good or both. You see, the plug may not be a straight shot and you will be drilling at an angle and screw up the head. I nearly did. Then you will need someone to weld up the hole shut and drill it out again. Best take the head off to a machine shop and have them do it.

speedy300Dturbo · #7 05-24-2005, 02:06 PM

Quote:

Originally Posted by aklim

I thought the CDI came out this year?

Quote:

Originally Posted by amolak

I dont really want to pay £2k to have the engine stripped.

Mercedes DOES make a special tool to rethread the glowplug holes, but the plugs themselved if broken off too close to the head need to be drilled out.

DieselJim · #8 05-24-2005, 02:12 PM

Yup. CDIs have been out in europe for several years. That means it is probably an earlier generation CDI. You don't have to use glow plugs on any diesel. Usually in nice weather my 300SD will start in under a minute even with out the plugs. It runs rough for a few seconds then it is cool too.

aklim · #9 05-24-2005, 02:41 PM

Quote:

Originally Posted by speedy300Dturbo

Mercedes DOES make a special tool to rethread the glowplug holes, but the plugs themselved if broken off too close to the head need to be drilled out.

I borrowed that toolkit from an MB shop when my 606 had a broken GP but didn't find it to be helpful. Besides, you want to drill a head out and retap it while it is on and have the filings go to the prechamber? If I could do it all again, I would have take it to a machine shop and have them take it out without the drilling.

amolak · #10 05-24-2005, 03:38 PM

i can live with it the way it is, but what I want to know is, will it wear out the engine?. or does one glow plug less not cause a problem.

tx
A

Jim H · #11 05-24-2005, 05:10 PM

I will not wear out the engine.

I will run rough when started, but not wear out.

Best Regards,
Jim

t walgamuth · #12 05-24-2005, 07:23 PM

if i had this problem i would take it to my favorite automotive machinist and he would get it out without taking the head off. it wont cause serious damage but it is irritating.

Johnhef · #13 05-24-2005, 08:12 PM

the new 05 stuff uses the CDI3 system, the plugs are on for a VERY short time, typically less than a second to start the car. in very cold weather, the plugs are kept on for a max of 3 seconds and will reachabout 1830 deg. F in that time.

On the CDI and CDI2 systems (Non-US only), I believe the glow plugs warming cycles were more necessary, hence the misfiring your mentioning.

amolak · #14 05-25-2005, 03:10 AM

Hi,
How would a machine shop engineer remove the plug?
What should it cost?
tx
Amolak

aklim · #15 05-25-2005, 09:20 AM

Well, it would have cost me less than $100 for them to remove it. They would have the drills to get it out at the right angle. The problem with my 606 was that it was not a straight in and out thing. It was angled and so when I drilled, the angle was off and it hit the head. They had a drill that could drill at the right angle constantly whereas a hand drill doesn't do that well when the head is in the car.

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