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  #1  
Old 01-29-2015, 08:38 AM
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1993 300D 2.5 Turbo - Engine won't Start

Ok, so I replaced the bad head gasket. Put everything back together the best I could. Made sure the timing and everything was correct. All appears well other then some confusion as to the vacuum setup on the turbo, but don't think that would do anything to prevent starting of the engine.

When I attempt to start the engine, it turns over strong, but immediately shuts off.

Here are some things I have attempted so far:

- New Charged Battery
- New Fuel lines
- Broke the fuel lines - Fuel shoots out with high pressure
- Glow plugs appear to have a current when I test them

Here are some other factors:
- The glow plug light in the center display does not go off, but this appears to have been the case before. Not sure if this matters

So, what else should I be looking at?

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  #2  
Old 01-29-2015, 10:03 AM
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Glow plug light on means you have a short circuit at one or more of the glow plugs this conditioneans none of your glow plugs will assist with starting. When you installed the connection wires on your engine they must be printed down if not when the intake manifold is nstalled the manifold will cause shorts.
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  #3  
Old 01-29-2015, 12:46 PM
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How did you test the glow plugs?
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'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC
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  #4  
Old 01-29-2015, 02:24 PM
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Quote:
Originally Posted by dieselbenz1 View Post
Glow plug light on means you have a short circuit at one or more of the glow plugs.......
Do you mean an open circuit at one or more glow plugs?
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  #5  
Old 01-30-2015, 02:05 AM
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Quote:
Originally Posted by funola View Post
Do you mean an open circuit at one or more glow plugs?
I mean you have a dead short easy to verify with a test light in any glow plug when you preheat the light will not come on
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  #6  
Old 01-30-2015, 08:59 AM
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When I preheated the light, and performed the light test, all the plugs appeared to be working since the light went on.

What else should I check?
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  #7  
Old 01-30-2015, 09:15 AM
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Additional information:

When we attempt to start it, there appears to be combustion since we are getting smoke from the exhaust.

The engine won't hold and shuts off.

Also, there is no acceleration when we try to start it with the accelerator.
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  #8  
Old 01-30-2015, 09:49 AM
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.

maybe you pinched shut of lever or messed shut of valve during reassembly?
.
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  #9  
Old 01-30-2015, 10:17 AM
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Quote:
Originally Posted by dieselbenz1 View Post
I mean you have a dead short easy to verify with a test light in any glow plug when you preheat the light will not come on
Is this "test light" a standalone test light separate from the cluster glow light? Here's the entire post which I do not understand:

"Glow plug light on means you have a short circuit at one or more of the glow plugs this conditioneans none of your glow plugs will assist with starting. When you installed the connection wires on your engine they must be printed down if not when the intake manifold is nstalled the manifold will cause shorts."

First, what is " printed down "?

This is the way I understand how the glow system works:

cluster glow plug light on indicates all glow plugs tested fine.

If there's a short circuit at one or more glow plugs, it will blow the glow relay fuse and the glow system no longer works.

If one or more glow plugs is burned out (open circuit), there's a circuit inside the glow plug relay that will detect it and the cluster glow plug light will be switched off, and no longer lights up at the preglow process.
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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked
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  #10  
Old 01-30-2015, 10:24 AM
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Are you certain when the tang is visable in the injection pump window. The first cylinder lobes on the camshaft are pointing generally upward?
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  #11  
Old 01-30-2015, 02:52 PM
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Quote:
Originally Posted by BullGator2020 View Post
All appears well other then some confusion as to the vacuum setup on the turbo, but don't think that would do anything to prevent starting of the engine.
as said before..maybe you messed shut off vacuum...so you shutting your engine all the time


.
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next wish/project: w114 coupe OM603 powered
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  #12  
Old 01-30-2015, 03:43 PM
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The "quick and dirty" way to test the glow plugs is to pull the big plug off the pre-glow relay, and the pin numbers correspond to the glow plugs. Using a good digital multimeter, measure from each pin to ground. You should get a value around 0.7 ohms (zero point seven ohms). That is a rather low resistance number for some meters.

The resistance of all the plugs should be about the same. Any outliers are suspicious.

Also check the big strip fuse (80 amps) under the cover of the pre-glow relay. Remove it (two philips screws) and hold it in your hand. Flex it a little. There should be no cracks.
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Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC
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  #13  
Old 01-30-2015, 05:17 PM
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Thank you for your suggestions. I will go ahead and try it out tomorrow and let you know.
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  #14  
Old 01-30-2015, 09:45 PM
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Quote:
Originally Posted by funola View Post
Is this "test light" a standalone test light separate from the cluster glow light? Here's the entire post which I do not understand:

"Glow plug light on means you have a short circuit at one or more of the glow plugs this conditioneans none of your glow plugs will assist with starting. When you installed the connection wires on your engine they must be printed down if not when the intake manifold is nstalled the manifold will cause shorts."

First, what is " printed down "?

This is the way I understand how the glow system works:

cluster glow plug light on indicates all glow plugs tested fine.

If there's a short circuit at one or more glow plugs, it will blow the glow relay fuse and the glow system no longer works.

If one or more glow plugs is burned out (open circuit), there's a circuit inside the glow plug relay that will detect it and the cluster glow plug light will be switched off, and no longer lights up at the preglow process.
93 602 glow operation
Insert key turn to glow position light in console comes on for a period of time say 8 seconds but is based on engine coolant temp. NORMAL OPERATION

Open circuit of 1 or more glow plugs or 1 or more plugs higher resistance not operating correctly. Plugs are energized for the same duration but lamp flashes.

Short circuit lamp does not glow for the 8 or so seconds then remains on for about a minute. These relays do not have a fuse just the circuits and auto reset. Power is not applied to any plug in this case.

My thoughts are one or more lugs are pointing upwards shorting to the intake manifold. If you are lucky you might even set it or them but fixing may require removal of the manifold but you are in the best position to determine e that.

What is the ambient temperature when you try to start the engine?
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  #15  
Old 01-31-2015, 09:42 PM
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Did you confirm IP vs cam timing?

Sixto
MB-less

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