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  #1  
Old 12-09-2004, 11:04 AM
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Disabled EGR causes burnt valve 5th cyl?

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???

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Old 12-09-2004, 11:06 AM
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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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Old 12-09-2004, 12:06 PM
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Why cylinder #5?
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Old 12-09-2004, 12:16 PM
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Thumbs down It's a mystery

Somehow recycled "HOT" exhaust gases keep valves in your engine from burning.
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Old 12-09-2004, 12:19 PM
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Quote:
Originally Posted by willrev
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???
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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Old 12-09-2004, 12:21 PM
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tell me more.is this on a 5 or 6 cyl,603 or 617 engine?
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Old 12-09-2004, 12:34 PM
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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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Old 12-09-2004, 12:43 PM
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Quote:
Originally Posted by Hatterasguy
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.
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............
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Old 12-09-2004, 12:55 PM
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Quote:
Originally Posted by tomm9298
Somehow recycled "HOT" exhaust gases keep valves in your engine from burning.
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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Old 12-09-2004, 07:28 PM
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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".
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Old 12-09-2004, 08:23 PM
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What's the best way to disable the EGR??

What is the best sure fire way to disable my EGR valve?? I will take care of that myself.
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Old 12-09-2004, 09:11 PM
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Quote:
Originally Posted by willrev
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.
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Old 12-09-2004, 09:13 PM
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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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Old 12-09-2004, 09:13 PM
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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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Old 12-09-2004, 09:37 PM
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Could that be where my other cylinder went???

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