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#1
01-04-2009, 11:23 PM
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Hmm...Where do i drill a hole for EGT probe??
I am planning to get a EGT soon, I need to know where is a good place to drill in for my EGT probe??? What do you use to seal around the probe, jb weld?? Welding it back???
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Current Garage 2008 Mercedes GL320 CDI 188k mi Repair/Work in progress 1994 S350 160k mi Garage Queen & prepping for repairs 2005 E320 CDI 203k mi Healthy & Daily Driver 1994 S350 357k mi Retried as parts car 1984 300TD 214k mi Blown OM617 Poss OM603 Swap?? Sold 1987 300SDL 200K+ 1994 S320 181K mi 2008 E320 Bluetec 127k mi 1999 S420 130K mi 1980 240D 360k mi 15+ Others that has come, stay and gone GONE, BUT NOT FORGOTTEN  1995 E320 SE 220k mi 1984 300SD 350k mi 
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#2
01-04-2009, 11:26 PM
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Which car? Tapped holes should already exist, no drilling required.
__________________
 "Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970
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#3
01-04-2009, 11:30 PM
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oh i am doing it on the 1984 300SD, i dont see a taped hole??? I there a bolt in the taped hole???
__________________
Current Garage 2008 Mercedes GL320 CDI 188k mi Repair/Work in progress 1994 S350 160k mi Garage Queen & prepping for repairs 2005 E320 CDI 203k mi Healthy & Daily Driver 1994 S350 357k mi Retried as parts car 1984 300TD 214k mi Blown OM617 Poss OM603 Swap?? Sold 1987 300SDL 200K+ 1994 S320 181K mi 2008 E320 Bluetec 127k mi 1999 S420 130K mi 1980 240D 360k mi 15+ Others that has come, stay and gone GONE, BUT NOT FORGOTTEN 1995 E320 SE 220k mi 1984 300SD 350k mi
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#4
01-04-2009, 11:48 PM
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Drill and tap here.
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#5
01-04-2009, 11:55 PM
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must it be under??? I dont think i have the space to do that kind of drilling... although i can take the manifold out but i its a hassle to take it out b/c of the turbo and oil for the turbo and oil drain tube... can i just drill on top of where you have shown but i still have to remove the manifold!!!! darn...
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Current Garage 2008 Mercedes GL320 CDI 188k mi Repair/Work in progress 1994 S350 160k mi Garage Queen & prepping for repairs 2005 E320 CDI 203k mi Healthy & Daily Driver 1994 S350 357k mi Retried as parts car 1984 300TD 214k mi Blown OM617 Poss OM603 Swap?? Sold 1987 300SDL 200K+ 1994 S320 181K mi 2008 E320 Bluetec 127k mi 1999 S420 130K mi 1980 240D 360k mi 15+ Others that has come, stay and gone GONE, BUT NOT FORGOTTEN 1995 E320 SE 220k mi 1984 300SD 350k mi
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#6
01-04-2009, 11:58 PM
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The turbo MUST be removed anyways. The metal shavings would damage it.
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#7
01-05-2009, 12:01 AM
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is there another place that i could place it...
__________________
Current Garage 2008 Mercedes GL320 CDI 188k mi Repair/Work in progress 1994 S350 160k mi Garage Queen & prepping for repairs 2005 E320 CDI 203k mi Healthy & Daily Driver 1994 S350 357k mi Retried as parts car 1984 300TD 214k mi Blown OM617 Poss OM603 Swap?? Sold 1987 300SDL 200K+ 1994 S320 181K mi 2008 E320 Bluetec 127k mi 1999 S420 130K mi 1980 240D 360k mi 15+ Others that has come, stay and gone GONE, BUT NOT FORGOTTEN 1995 E320 SE 220k mi 1984 300SD 350k mi
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#8
01-05-2009, 12:05 AM
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The turbo housing.
No matter where you decide to drill/tap for EGT, the turbo has to come off. There is no way around it. ...and no, the EGR tube won't work...
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#9
01-05-2009, 12:22 AM
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man this is going to be a tough one
 ,is it hard to remove that exhaust manifold???
__________________
Current Garage 2008 Mercedes GL320 CDI 188k mi Repair/Work in progress 1994 S350 160k mi Garage Queen & prepping for repairs 2005 E320 CDI 203k mi Healthy & Daily Driver 1994 S350 357k mi Retried as parts car 1984 300TD 214k mi Blown OM617 Poss OM603 Swap?? Sold 1987 300SDL 200K+ 1994 S320 181K mi 2008 E320 Bluetec 127k mi 1999 S420 130K mi 1980 240D 360k mi 15+ Others that has come, stay and gone GONE, BUT NOT FORGOTTEN 1995 E320 SE 220k mi 1984 300SD 350k mi
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#10
01-05-2009, 12:31 AM
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not really. Its just involved and you need a new gasket when you put it back on.
oh and dont screw up the oil lines for the turbo. If I were you I'd get a manifold from a junkyard and have it drilled/tap'd and ready to swap in.
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#11
01-05-2009, 10:01 AM
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Now, this is not a "best practice" but I've seen a lot of guys do this on their trucks. They drill and tap the hole in place on the truck but they coat the drill and tap with grease and hold a small speaker magnet up against the tool while drilling and tapping to keep the chips out of the manifold. Like I said, not the recommended practice and all...
Also, when you tap the threads, only run the tap down a little way into the part - maybe 3/8". The pipe thread is tapered and if you run it in too far, the probe fitting will bottom out and could leak. When the probe holder is installed, you should see about 1/8" of threads still remaining exposed.
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-Evan Benz Fleet: 1968 UNIMOG 404.114 1998 E300 2008 E63 Non-Benz Fleet: 1992 Aerostar 1993 MR2 2000 F250
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#12
01-05-2009, 10:59 AM
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2x Get a junkyard manifold, you should be able to get one for ~$20.
Don't forget to "fix" the EGR while the manifolds are aff
__________________
$60 OM617 Blank Exhaust Flanges $110 OM606 Blank Exhaust Flanges No merc at the moment
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#13
01-05-2009, 11:30 AM
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Perhaps it's only the '85 California OM617 engines that came with a tapped hole? It was designed to allow measurement of back pressure (= plugged trap oxidizer) but makes a great mounting place (at the rear of the exhaust manifold) for an EGT probe. Alas if the Federal versions do not have that tapped hole.
BTW, the OM603 engine in the W124 300D Turbo also has a tapped hole in the exhaust manifold. It's at the front of the exhaust manifold, near the turbo dump valve. In the following picture, you can see the bolt that plugs the hole in the rust-colored manifold, just to the left of the valve cover breather hose. The OM617 is similar but placed at the back of the manifold. Jeremy 
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"Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970
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#14
01-05-2009, 12:42 PM
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thats not a very good place for EGT's since its coming off once cylinder.
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#15
01-05-2009, 01:32 PM
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you want it right before the turbo to see what the turbo is seeing, you can install it downstream but your EGT's will be 2-300 degrees cooler than what the turbo is actually seeing.
__________________
Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac? As long as they would add one additional commandment for you to keep thy religion to thyself. George Carlin (Wonder where he is now..) 1981 240d (engine donor 1983 240d) recently rebuilt engine hurray! - No more.. fought a tree and the tree won. pearl black 1983 240d 4speed (Converted!@$$%) atleast the tranny was rebuilt.
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