84--300d # 4 glow plug WILL NOT come out I have tried putting vise grips on plug and using a crow bar to push it out it will not come. I screwed it back in because I did not want to break it. HELP

Patience, my son.

Don't force it.

You've got to spend a couple of hours working it back and forth.........a bit at a time.......to break it free from the accumulated carbon buildup.

The use of a solvent such as Kroil or PB Blaster is sometimes of assistance.

You'll definitely need a glow plug reamer to install a new one.

Bought a glow plug reamer off ebay sould be here tomorrow.
Another question what has to happen if it breaks off?
Sure hope it does not but there is always a chance I guess.

Howdy,

Ain't that Kroil some stuff......the absolute penetrant.......PB Blaster is also really good stuff, and more easilly available.......

You might want to try some carbon solvent purchased at the rifle cleaning supplies counter at WallMart......and squirt that onto the glow plug, allow it time to work it's way into the carboned up area.....and as Mr. Carlton says.....work it back and forth.....and repeat process, it may take a day or two.....Rome and your carbon deposit weren't built in a day!!!

SB

__________________

Diesels:
'85 300D, "Max, Blue Benz", 155K, 27.0 MPG
'84 190D 2.2, "Eva, Brown Benz", 142K, 40.2 MPG
'77 240D (parts car)
'67 Eicher ES 202 Tractor "Otto" (2cyl, Air Cooled, 30HP)
Gassers:
'94 Ford F-150, "Henry", 170K (300 Six) 17.5 MPG
'85 190E 2.3, 148K....Parts Car
'58 Dodge W300M Powerwagon (Flat Fenders) Less than 10 MPG

Just so you understand.

If it breaks off, you're looking at a miserable project to drill it out and tap it again. Since the injection pump is in the way on 1-3, you'll be removing that.

Since the oil filter housing is in the way on 5-6, you'll be removing that.

And, if you're unsuccessful in attempting to drill and retap it on the engine, you're looking at pulling the cylinder head to repair it.

Furthermore, if you do manage to repair it without removing the head, you'll be pulling the prechamber to remove all the accumulated crap that is now plugging the very tiny holes in the bottom.

A word to the wise:

Patience, my son.

Well All 5 glow plugs are out now #4 & #5 were hard coming out reamer came in today so I have all 5 holes reamed and turn the motor over to blow the crap out have 5 new bosch plugs ordered so I guess I am do good this time around,,. Thanks for the help.

PS: used a half can of wd40 to make it work.

Best $4.00 you ever spent in your life.............