i am going to replace glowplugs in my 85 300d turbo diesel where are they located also how do i tell what size engine i have

oh boy... they are on the engine block (drivers side). You have a 3.0L I-5. Dont put gas in the tank either..

good luck!

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is there some things i should know about when replacing them ?

There's some things you should know about posting a question such as letting us know what model and year Mercedes Diesel you're talking about

Sixto
87 300D

i believe i did
well i did some research and its pretty much unscrew the old one, screw in the new one

Is pretty rare for all of them to be bad; have you tested them, or are you changing all of them for some other reason.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

Make sure you get Bosch.

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http://superturbodiesel.com/images/sig.04.10.jpg
1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42

Go to dieselgiant.com and follow the glow plug testing procedure before changing them. No need to change them if they are all working correctly.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

When you go to the Diesel Giant sit and his pages open up it often looks like what you were looking for is not there. You have to scroll down the page to see the text and pics.

Bosch or Beru Glow Plugs are the only ones that hold up well. The Bosches are easier to find, cost less and are just as effective.
Totally avoid Autolite Glow Plugs. After 3 months use the tips of 2 of mine had swelled up and I had trouble getting them out.

You also might want to consider reaming/cleaning out the Carbon in the glow plug holes. They will work better and some claim the Carbon build up can shorten the life of the new Glow Plugs.

We also have a DIY, Do it yourself section on how to do many of the jobs.

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84 300D, 82 Volvo 244Gl Diesel

well i already have them ordered the problem is it is really hard to start in the morning or any time its cold so im just doing the process of elimination
no harm in replacing 23 year old glow plugs right
yes i did order bosch plugs $12.00 a piece

Put a little anti-seiz compound on the threads, then in 23 years they will come out easier.

Have you done a valve adjustment? that will help on the cold starts also.
the valves tend to tighten up as they wear, then the engine looses compression making it harder to start.

Charlie

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there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works

Hey Sixto, there are also some things you need to know about reading a post.....
[we've all been there]

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Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John