The mechanic told me that he had heard that disconnecting the EGR could potentially cause a burnt valve in cylinder #5. He said plenty of his customers's EGRs were disabled cause they didn't want to spend $$$ to replace. He said he had heard this but never seen a problem himself. Is this true???

The Mechanic is an idiot.....................Did all cars before EGR burn valves?
Do all the 617 motors made before 1980 when EGR was first used burn valves?

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Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
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Section 609 MVAC Certified
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"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche

Why cylinder #5?

Somehow recycled "HOT" exhaust gases keep valves in your engine from burning.

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1984 300D Turbo Sedan (Hilda) 272,115 miles.....
Anthracite Gray/Palamino Leather, I am 3rd owner

2001 Dodge Stratus (Silver) (wifes) 55814 miles...

1982 280TE Wagon Astral Silver Metallic/
Anthracite Velour
260,512 miles (Eva)

1969 230 Sedan Olive Green/Black MBTex
4 Speed Manual
84,213 miles ????
Haus Frau


2004 Boreem Ninja Pocket Bike
Highly Modified 49cc (Ling Ling)

Einigkeit und Recht und Freiheit

No, it's not true. Tell the "mechanic" that Euro cars had no EGR, and the EGR was designed for the North American market. Aside from hearsay, ask him why not replacing sooty exhaust with fresh air would damage exhaust valves. It's more likely the opposite would be true. Will, maybe you need another mechanic

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'82 300SD - 361K mi - "Blue"

"Good judgement comes from experience. Experience comes from bad judgement."

listen, look, .........and duck.

tell me more.is this on a 5 or 6 cyl,603 or 617 engine?

Well from my understanding of the egr system is that on newer gas engines you will burn a valve, you will also ruin the cats to. (by newer I mean late 90's up) But on diesels the egr does nothing get rid of it. All the euro engines didn't have them and they run hundreds of thousands of miles without them. I would venture to say the egr actaully shortens engine life. That soot can't be good for the valves.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200

Like I said.....my '79 300SD didn't mysteriously lose its EGR, It never had one.......nor did any of the early 300D (pre 1980) non turbo 617 engines............

__________________
Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
---------------------
Section 609 MVAC Certified
---------------------
"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche

Actually, circulating exhaust gas into the intake decreases combustion temperatures. It's high combustion temperatures that create oxides of nitrogen, and that's why EGR was required.

But I agree it's ridiculous to think one would burn a single valve by disabling the EGR. Maybe if an injector was dripping...

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'83 240D with 617.952 and 2.88
'01 VW Beetle TDI
'05 Jeep Liberty CRD
'89 Toyota 4x4, needs 2L-T
'78 280Z with L28ET - 12.86@110
Oil Burner Kartel #35

http://i16.photobucket.com/albums/b1...oD/bioclip.jpg

Think about the placement of the EGR. It's at the side of the manifold at an angle up and to the side. Almost all of the EGR cr@p will be sucked/blown into the 1,2,&3 cylinders. If you ever pull the manifold off a 617 with a working EGR you will see the gunk is thickest by those 3 cylinders and #5 is almost "clean".

What is the best sure fire way to disable my EGR valve?? I will take care of that myself.

Very simple. Just pull off the vacuum hose to the top of the valve and plug the hose. 30 seconds and you are done.

If the valve itself doesn't leak, then remove the vacuum hose from the EGR, insert a BB (one that's bigger than the vacuum port on the EGR) in the vacuum hose and reconnect the hose to the EGR. This blocks vacuum to the EGR while providing a stock look. Of course, this is for "off-road" use only.

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85 300CD
83 300TD
78 240D (daughter)

Easiest is to remove the vacuum line and put a vacuum plug over the two nipples that the line ran between.

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'10 Chrysler T&C Stow-N-Go White. Grandpa's ride.

'13 Chrysler 200 Touring Candy Red. Grandma's ride.

Age and cunning will always over come youth and vigor.

Could that be where my other cylinder went???

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'10 Chrysler T&C Stow-N-Go White. Grandpa's ride.

'13 Chrysler 200 Touring Candy Red. Grandma's ride.

Age and cunning will always over come youth and vigor.