Re: [diesel_mercedes] Possible Stuck Valve

By "blow out", do you mean it is completely gone?  Does it look like it melted away, and what's left has melted ends?

I had a similar problem with the number 5 cylinder on my '77 300D.  After I replaced it the second time, it stopped doing that.  The theory is that something was in the pre-chamber, something metal, that was grounding out the loop tip of the glow plug, and causing it to burn off.  In my case, whatever it was, finally worked it's way out of the engine.  It was fine up until I installed pencil-style glow plugs using the Diesel Giant adapter kit.  Then, it was FANTASTIC!  It now starts quicker than most gassers, even in severe cold.

Anyway, I doubt you have a bad valve causing destruction to the glow plug.  You can check valve condition with a compression tester to verify, though.  An exhaust valve can't stick closed, unless you have some real problems with the camshaft or valve train...

Mark in Fort Collins, CO

-----Original Message-----
From: babytoelint
Sent: Jan 28, 2008 6:12 PM
To: diesel_mercedes@yahoogroups.com
Subject: [diesel_mercedes] Possible Stuck Valve

I think that the exhaust valve on my 1977 240D is either sticking
closed or opening late.

The symptom: The center of the glow plug on the number three cylinder
blows out of the body of the plug. The first time that it happened, I
figured that it was just an old plug that did not make it until I
planned on changing it. Now a new plug has blown out.

The only thing that i can think of would be the exhaust valve sticking
closed or opening late.

I am planning on replacing the timing chain, since I do not know when
the previous owners did that last.

Any other ideas that I should look at, before pulling the head to get
at the valves?

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