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Old 11-24-2008, 11:20 AM
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My GP controller had to been staying on a while.I replaced it with a updated one after I installed new regulator.Lucky I did not fry all my lights.I was getting 16 volts with everything running.
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Old 11-24-2008, 11:21 AM
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Originally Posted by tangofox007 View Post
How much overlap is there between glow plug operation and the alternator coming on line? Absent an afterglow timer, there should be almost none.
Exactly what I was thinking.
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Old 11-24-2008, 11:31 AM
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Originally Posted by t walgamuth View Post
I changed the glows on my 83 240/300D today because it was getting hard to start.

All five were shot!

Is this a record?
All at once, on most diesel engines, at some time through the years.

It is common for the majority of owners to put off glow plug replacement until the vehicle will not start.

Eight on the Oldsmobile 350 diesels was the most common, some had ten sets in one winter = operator error (starting fluid).

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Old 11-24-2008, 06:12 PM
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Thumbs up

Four out of Six when I purchased my SDL.
I'm not a doctor, but I'll have a look.

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Old 11-24-2008, 08:07 PM
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4 or 5 out of 5 on my 300SD, wouldn't start when it got cold.

The strange thing is they all tested fine with a meter. But when you took one out and put it on a battery it did everything but glow. The new ones got toasty red.
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Old 11-24-2008, 09:19 PM
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Originally Posted by t walgamuth View Post
I changed the glows on my 83 240/300d today because it was getting hard to start.

All five were shot!

Is this a record?
Unfortunatly when all the glow plugs are burnt out it makes me a little suspicious Tom. For starters the glow plug relay may be coming back on.I would either monitor that or if I had a spare good relay around the garage exchange it. . I would also ream the plug holes for potential excess carbon build up in that situation.

Fortunatly in your case the plugs just aged out or the filaments just wore out out so to speak. So no ongoing concerns at all. Nothing lasts forever.

Unfortunatly it is not a record either. There is no reason to despair though. Since there is no tangiable reward or recognition for holding the record. What does it really matter? The only trophy just might be the burnt out award. At our approximate ages who really needs that particular one?

In ancient times we were taught that filaments and cathodes had finite lives. Efficiency just falls off with time and use. Probably the repeating on/off cycles oxidized the filaments impairing their ability to boil off or transfer electrons.

In a glow plugs case if the fundemental resistance was still very low The slowly developed coating or changes might act as a restriction to the electron/heat transfer. Or perhaps the very nature of the metal filament is changed with time and use. So the plug will not glow red.

Last edited by barry123400; 11-24-2008 at 10:14 PM.
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Old 11-24-2008, 09:51 PM
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I already hold that one I think!

Do you think diesel can wash the rings and cause low compression like it can with a gasser? I am still having trouble getting it started.
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Old 11-24-2008, 10:09 PM
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More likely your restart problem is caused by something else. You might want to monitor the actual glow plug voltage at the plugs during a cycle. There is a very slight chance you checked your old plugs with very low voltage.

Or there is for some reason not much voltage present in the glow circuit. If that was the case the new glow plugs are not functioning much better. If you do not own a cheap meter get one. I suspect you already do own one though. I also have no ideal what your regional temperature is there right now.

I would still tend to eliminate that glow plug circuit as a possibility first. Takes little time to do it. You should almost always return to the original fault area before moving on. I know I dislike going around in a circle on problems myself.

I hope and suspect not a cylinder wash down. I imagine a diesel could be slightly flooded by repeat attempts to start but should clear itself. It would take a lot of cranking to get much actual fuel in there and most would be blown out I suspect. The cylinder washdown angle is possible on a really marginal engine I imagine but do not really know enough about diesels to really comment. I also suspect your engine is not marginal.

Last edited by barry123400; 11-24-2008 at 10:16 PM.
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Old 11-25-2008, 01:37 AM
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Originally Posted by oldsinner111 View Post
I had 4,then a bad regulator causing my alt. to put out 16 volts,burnt all 5 bosch duratherms.New Gp. relay,then 5 new Beck an Arnley good.Except for #1 cylinder that needs a new one once a month now.
I need to do valve seals,and put Monark tipped injectors.
that cylinder may have a broken pre combustion chamber. the little ball may have burnt off it's sticks. or it has a bad injector, or both.
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Old 11-25-2008, 11:01 AM
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I think thats why most mb diesels get tossed to the yards,their sold to an unexpecting buyer who knows nothing about cars , its purchased very cheaply already and instead of persuing a fix they end it there.I wished I could yard start some just to find out ,they wont let you hook up any batteries and test run them though.I see alot of dirty fuel filters under those poor beast hoods also.
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Old 11-25-2008, 01:07 PM
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love all animals
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Yeah its louder than others.#1 injector. I bought a set on ebay a year ago.Used with only 70,000 miles.I've seem them always advertising.Tax time getting thoose Monarks from mecedessource.
I added a new autolite gp.Couldn't get a german brand.I did ream more carbon out.The other one had not failed yet.

Last edited by oldsinner111; 11-25-2008 at 02:06 PM.
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