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  #16  
Old 09-02-2002, 06:37 PM
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Only the exhaust valves are sodium filled for heat transfer. Think of it: The exhaust valves have fire flowing over them when open and the intake valves have relatively cool air flowing over them when open.

Now, could someone explain why sodium is used instead of copper?

P E H

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  #17  
Old 09-02-2002, 08:59 PM
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Easy, it melts. The liquid circulates, transferring the heat from the head to the stem, where it goes through the vavle guide into the cooling system.

Peter
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  #18  
Old 09-02-2002, 09:59 PM
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back on topic...

At the risk of ending the sodium discussion...
I think P.E. Haiges may have the best place to start... Check all your vaccuum lines for leaks, esp. egr connections. One slip when you're under there and you could easily disengage a line or two.
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2004 E500 4matic; 72,000mi
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  #19  
Old 09-03-2002, 01:22 AM
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Not to start another sodium discussion, but that's what I figured; exhaust only. Thought I'd ask though: never had the head off myself.

As for vacuum, I have no ALDA or EGR on my car so this isn't my territory. Haven't had any other vacuum problems either, so can't say.

Thanks P E H.

ATLD

Adam T. L. Delecki
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  #20  
Old 09-03-2002, 03:29 PM
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Well, here's an update. I took the car into my mechanic for him to take a look. He checked the EGR, vacuum, valve lash, injectors and glow plugs. All were fine. He narrowed the problem to cylinder #4. He said the problem was internal and would have to pull the head off to see what was really wrong. He said the head probably needs to be rebuilt. So this is where I am at.
Tim
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  #21  
Old 09-03-2002, 09:26 PM
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What's his evidence.

I'd figure that if the problems started only when you did your valve job, it's related to that in some unseen way.

before you put out the big $$$ try to get a better understanding of why the mechanic thinks that the #4 cylinder is bad.

I bet, that probally the only thing that seems possible now, is that CAN DO may be right. The only thing I can see that happened was a broken off glowplug element. You should be able to discover this by removing the precombustion chamber; or even just the glowplug first, to see if it's all there.

I bet that was just a freek problem, not really related to the valve job, unless the increased compression (with valves working better) caused one to break free.

How did the mechanic limit it to cylinder 4, compression test, stethescope, how? I'd find that interesting.

ATLD
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  #22  
Old 10-24-2002, 10:23 AM
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Update:
Well it did turn out to be the exhaust valve on the #4 cylinder. Apparently, the valve had worn in an oval shape. I know the valves are supposed to spin so they wear evenly, but I guess that wasn't the case for this one. My mechanic said that I didn't do anything wrong on the valve adjustment, but by doing so, I turned the valve a little causing it not to seat properly, which exposed the root problem. The machine shop did a valve job on the head and said the valve guides were worn and that they had to cut a new seat for the #4 exhaust valve. While the head was off, I got a chance to see what the lowerend looked like. I could still see the cross hatching on the cylinder walls and the pistons looked good. She runs great now. Thanks.

Tim
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  #23  
Old 10-24-2002, 11:23 AM
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That's great. Glad it got fixed, but wish it was a simpler problem.

How many mile on your car?

ATLD
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  #24  
Old 10-24-2002, 01:37 PM
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165,000 and counting.
Tim
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  #25  
Old 10-24-2002, 01:47 PM
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Next question. What did all that cost? Sounds like you took it into the shop and had them pull the head?

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