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#1
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Urgent - Squeaking Glow Plugs
So, removing the glow plugs and hear them squeaking. Does that mean I need to ream them? Been just over a year.
What does wet glow plugs mean? Please answer simply and not derail this. Thank you all!
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Current fleet: 1985 Mercedes-Benz 280TE - Waiting for heart surgery. 1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home. 1979 Mercedes-Benz 300TD - Parted out. 1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration. 1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration. 1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health. |
#2
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Could just be metal squeaking on metal. If you have a reamer, go ahead and ream it, but if not, you can probably leave it alone... squeaking sounds more like metal-to-metal than metal-to-carbon.
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"Senior Luna, your sense of humor is still loco... but we love it, anyway." -rickymay ____ "Your sense of humor is still loco... " -MBeige ____ "Señor Luna, your sense of humor is quite järjetön" -Delibes 1982 300SD -- 211k, Texas car, tranny issues ____ 1979 240D 4-speed 234k -- turbo and tuned IP, third world taxi hot rod 2 Samuel 12:13: "David said to Nathan, “I have sinned against the Lord.” And Nathan said to David, “The Lord also has put away your sin; you shall not die." |
#3
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Hmmm.
I think it's standard procedure to ream them each time you pull them. not sure what squeaking would indicate, but reaming is always good practice. as for the wet plugs, it means the motor was not firing on that cylinder just before you pulled the plug. and that the plug is bad, so it did not vaporize the fuel...
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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! |
#4
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just replaced mine yesterday and there was a squeaking sound on a couple, a couple were wet when i pulled them, just means that cylinder was about to fire and the injector has likely leaked down from sitting, i made my own reamer using a old GP and a drill, i reamed the ones that were easy to get to and there was NO carbon so i didn't bother on 4 and 5, i had actually checked 5 with a bore scope a couple weeks back and didn't see anything.
number 1 was hard to get lined up and get the threads started that's why i made the reamer, the reamer was hard to get going and i got a bit of metal but really no carbon, my guess was the prechamber wasn't lined up very well and making contact with the GP or maybe a burned and distorted prechamber like i have seen in pictures on line? the new GP did go in pretty easy after that.
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"NEW" 1984 300D TD needs some love |
#5
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thought they always squeeked. replaced a set on a 300D and a 240D, both times squeeked
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1981 NA 300D 310k miles |
#6
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Same on both OM603's I've changed glow plugs on.
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Allen Kroliczek Oak Grove Autosport | Oak Grove Autosport 01 G500, 82 300TD, quite a few more..... |
#7
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Wow! Thank you all for the replies!
I started right after a long hot drive of 15 miles, so why was a couple cylinders not firing? Or, are you saying that cylinder was about to fire? That makes more sense. After I posted this, I found my reamer! Did a test on a squeaky one, and we were right: the reamer barely goes in! Is that normal?
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Current fleet: 1985 Mercedes-Benz 280TE - Waiting for heart surgery. 1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home. 1979 Mercedes-Benz 300TD - Parted out. 1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration. 1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration. 1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health. |
#8
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Well, this is my first time, and putting up a good fight! Didn't help getting called away.
Now with you alls help, I am set to go once I eat enough to get my blood sugar up.
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Current fleet: 1985 Mercedes-Benz 280TE - Waiting for heart surgery. 1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home. 1979 Mercedes-Benz 300TD - Parted out. 1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration. 1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration. 1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health. |
#9
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Turns out position is key! Get it in the hole right and one can shove it deep and clean it out. Once I shoved it in it felt as if a chunk broke free and went deeper inside. The other two only had light amount of carbon. Since it is way late and was causing misery, figured stop at three, since number five was the only supposedly bad plug. Plus, to do the front two one has to remove the fuel lines. Can't wait to hear if it makes any difference.
Also got the oil pad glued to the new pan, but needs to cure and also haven't ordered Mobil T.D.T..
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Current fleet: 1985 Mercedes-Benz 280TE - Waiting for heart surgery. 1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home. 1979 Mercedes-Benz 300TD - Parted out. 1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration. 1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration. 1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health. |
#10
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If it is the threads that are squeaking a shot of penetrating Oil ought to stop the squeaking.
If it is the Tip that is squeaking then the Glow Plug holes should be reamed or otherwise cleaned out. If you installed Autolite Glow Plugs (I did that) in as little as 6 months I remove them and found 2 of them were squeaking but it was because on those 2 the tips of the Glow Plugs had swollen and took considerable force and a Vice Grips to yank them out. If you put some Never-seez type compound on the Glow Plug Threads (also good on the Injector Threads) when you install them they will not squeak the next time they are removed.
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84 300D, 82 Volvo 244Gl Diesel |
#11
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Quote:
There was only light carbon on two out of three, and the one not positive. Most likely the wetness was the penetrant and the squeaking was the metal on metal. Good to know to stay away from Autolight! I used and will only use Beru! I was concerned about too much thickness causing a grounding issue. I used A.T.F. and plan on removing them next Fall in preparation for winter. So, still clacky, but less. I also adjusted the arc and injection pump throttle linkages, and now have a scalded kitten! Idle between these two means now about 900R.P.M., so will turn in the pump rod a tad. The only reason I adjusted as didn't feel right compared before taking apart the linkage to gain access to the glow plugs. Guess soggy is the best way to describe the feeling.
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Current fleet: 1985 Mercedes-Benz 280TE - Waiting for heart surgery. 1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home. 1979 Mercedes-Benz 300TD - Parted out. 1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration. 1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration. 1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health. |
#12
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Answer
Quote:
It is the reason why MB calls for using a reamer every time the glow plugs are removed / installed. Breaking up the accumulated carbon is important. Carbon frequently forms a semi rigid sock around the electrode, this acts as an insulator potentially causing premature (overheat) failure of the glow plug. At the very least; this semi rigid Carbon sock insulation makes cold starting more difficult. On my personal vehicles, I actively look for justification to remove, test and ream, at least once per year. .
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ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/ |
#13
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Always ream the GP hole before installing a new GP.
Yes, the squeaking is caused by the carbon.
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1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors. 2003 S430 - 107K 1983 300SD - Tanoshii - mostly restored ~400K+. 1983 300SD - Good interior. Engine finally tamed ~250K. Monark Nozzle Install Video - http://tinyurl.com/ptd2tge |
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