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  #16  
Old 04-16-2010, 10:25 PM
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Very unlikely that the IP has failed like that. blow & suck air (mouth pressure in & out of the shut off diaphragm on the IP, it may be stuck.
Is there fuel coming back through the return line when you crank the motor?
There is a lot more diagnostics to do before the IP gets the blame.

Best you get your dads mechanical friend to have a read of your thread before he makes decisions. Some of the others who have commented on here are very experienced diesel specialists. If your dads friend is experienced with diesel Mercedes, chances are he would of at least heard of 1 or 2 of them!

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Last edited by layback40; 04-16-2010 at 10:30 PM.
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  #17  
Old 04-17-2010, 12:01 AM
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Quote:
Originally Posted by KnightOwl View Post
Update: Never did any vavle adjustment yet because it really doesn't make sense to....
Oh, that is classic.
Why did you come to this forum if you know so much ?
When it would not start with the spray the first and most obvious cause to check is lack of compression..... due to valve clearance....
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  #18  
Old 04-17-2010, 02:17 PM
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Quote:
Originally Posted by leathermang View Post
Oh, that is classic.
Why did you come to this forum if you know so much ?
When it would not start with the spray the first and most obvious cause to check is lack of compression..... due to valve clearance....

That is a classic. I might not be the smartest here but even i know it doesn't take a scientists to figure out that if you aren't getting fuel to your return line when cranking it has nothing to do with the valves i dont care how much clearance it has. Fuel must always go when cranking.

Leathermang, say something smart or dont say anything at all. Of course i came to this forum for help because i am in need of it, but blaming it on some valve clearance is ridicules and not needed when its clearly a fuel issue. Of course the valves will need to be tune as they are well over due, but it doesn't mean it causes the fuel not to come through the lines. If we had fuel coming through our return lines i would be leaning on the valves issues just like you, however lets get the fuel thing fixed then we will go to our next step.

As for the IP being stuck, what can i do to check up on that? That sounds like more of our problem. I know IP are very sensitive and if you tweak something in-correctly you can have a run-away engine so i am always trying to stay clear of the IP's. But in this case, it seems like i need to check it out. Let me know, thanks ahead of time.
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  #19  
Old 04-17-2010, 03:44 PM
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Quote:
Originally Posted by KnightOwl View Post
That is a classic. I might not be the smartest here but even i know it doesn't take a scientists to figure out that if you aren't getting fuel to your return line when cranking it has nothing to do with the valves i dont care how much clearance it has. Fuel must always go when cranking.
You have changed the subject of the thread..
you were dealing with why it would not run.
When you sprayed into it THAT WAS FUEL and it should have run while that was being supplied..
and THAT not running while the fuel was being supplied by spraying DOES point first to not having compression .... not to the liquid fuel system on the car.. which you want to deal with instead of the logical first step ...
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  #20  
Old 04-17-2010, 03:54 PM
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I told him that before.. He disregarded my idea because his friend is the mechanic not me lol. But to me it makes a clear sense. I am forcing him to do a compression test as we spoke last night. I am trying to get him to do that.

However, on another note, the metal fuel line that goes from injector pump to the injectors on engine......... do they need to be spraying with force?> He unscrewed the metal fuel line right before it enters the engine and when he cranked it, nothing came out. I did see some diesel inside the plug though. Whats normal and whats not, let me know thanks.
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  #21  
Old 04-17-2010, 04:17 PM
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Just set the valves... they need to be right for a compression test anyway... that is not something used to find that the valves are not set properly... a feeler gauge does that...then try the spray..
see if that causes it to run temporarily ....
Then start on the liquid fuel available to the engine...
Are you going to be charged for the compression test ?

I am not saying you don't have other problems... I am just saying that the logical and cheapest way to proceed is to make sure the valves are set properly... and then get some fuel in by spraying...
then report back to us...
other things could have happened ... and we can sort it out... but it does not make sense to not be sure the valves are set properly before doing the other stuff....
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  #22  
Old 04-17-2010, 04:27 PM
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Knight Owl.
check your PM's...
either go to the user control panel..
or click ' your notifications' upper right on page
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  #23  
Old 04-17-2010, 04:38 PM
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Thanks for the quick update. I am trying to convince him to do a valve check but he is being stubborn. I think i have a better chance of making him do a compresson test and if the compression test turns out weak (which i think will be) then it will force him to do the valves check. I mean i understand his pain, this engine shows no life whats so ever so i can understand that he doesn't want to spend the time on the valves yet he is ready to buy a new injector pump lol.

Can anyone explain if the injector fuel line should be spraying fuel if you remove the line that connects to the plugs while cranking?
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  #24  
Old 04-17-2010, 04:40 PM
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Whose car is this ?
Who is paying for whatever is happening to the car labor and parts wise ?

WHo's pain are were talking about you feeling ?
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  #26  
Old 04-17-2010, 04:55 PM
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Yes, there should be fuel coming out of the hard injector lines when cranking. There is a long thread on here by a guy in Louisiana (?) who had an SD with similar symptoms. It was a failure in the timing device on the end of the IP. He figured out that his IP was not turning. Before you go down that route, you need to confirm that your shut off valve on the back of the IP is not activated. Pull off the brown vacuum line and crank it over and see if you get fuel.
I agree that you should get some action with starting fluid or WD40 into the intake but it wasn't clear to me how much you were spraying at what location when you were using the stuff.
A compression test only takes a half hour or so and personally I would run a compression test before adjusting the valves if for no other reason, just to find out what effect the valve adjustment had.

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  #27  
Old 04-17-2010, 05:01 PM
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As soon as you start doing the valve setting with the feeler gauges you are going to know if the valves are set too tight.
If you are going to hook up that sort of test equipment... do a leak down test... a more specific pointer in terms of reason for loss of compression.
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  #28  
Old 04-17-2010, 05:05 PM
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Then you need an air compressor and the right fittings to air up the cylinders. I'm thinking more people are likely to have just the cheap old HF diesel compression tester which can be threaded into the glowplug holes in a jiffy.
My guess is that the ether wasn't actually reaching the cylinders and that the problem is fuel related. It's unlikely that a diesel with low compression would just stop running driving down the road. That symptom points to something else. Low compression engines usually show up as 'no-start' engines.
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  #29  
Old 04-17-2010, 05:19 PM
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so we pulled off all 5 metal fuel lines coming from the IP to the Glow plugs. He cranked it and i saw for a second couple squirts in order from each injector outlet... However when he cranked again nothing happened anymore..... We kept cranking it like 3-4 times.. then he removed the brown air hose that was clamped in at the back of the IP... Tried it like 4 times and still nothing...

So we aren't getting fuel right now.. this is where we are stuck..


(PS, this is my dads rig and i am trying to help him as he obviously to old and cannot use a computer)
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  #30  
Old 04-17-2010, 05:32 PM
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could it be the emergency auto shut off for the pump keeping the ip closed? Anyway we can test that?

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